Method and device for determining deformation resistance of foam core mold, electronic equipment and medium

Abstract

The invention provides a method and a device for determining the deformation resistance of a foam core mold, electronic equipment and a medium. The method comprises the following steps: acquiring the apparent density and at least one rapid test index of a to-be-tested foam core mold; the rapid test index is a field measurable parameter having a statistical association relationship with the standard compression permanent deformation rate; inputting the apparent density and the rapid test index into a constructed qualification judgment model corresponding to the type of the to-be-tested foam core mold to obtain a qualification judgment result of the to-be-tested foam core mold; the qualification judgment model comprises a first mapping relation and a second mapping relation; the first mapping relation is a mapping relation between the apparent density and the compression strength, and the second mapping relation is a mapping relation between the rapid test index and the standard compression permanent deformation rate; and judging whether the anti-deformation capability of the to-be-detected foam core mold is qualified or not according to the qualification judgment result of the to-be-detected foam core mold. Therefore, through on-site rapid testing and modeling judgment, the determination efficiency of the anti-deformation capability of the foam core mold is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of bridge engineering material quality detection, and in particular to a method and device for determining the deformation resistance of a foam core mold, an electronic device, and a medium. BACKGROUND

[0002] In the construction of a precast hollow slab beam bridge, the foam core mold, as an inner mold for forming the cavity of the beam body, directly determines the quality of the beam forming. If the core mold is excessively compressed and permanently deformed under the pressure of concrete pouring, it will lead to insufficient thickness of the slab concrete, thereby reducing the structural load capacity and shortening the service life, and even causing safety hazards.

[0003] The existing method for determining the deformation resistance of a foam core mold adopts a standard accelerated aging test method, and a typical representative is the accelerated aging test method specified in Test D of ASTM D3574 standard. This method requires that after the sample is compressed by 50%, it is kept at 70°C for 22 hours, and then the residual deformation rate is measured after cooling to the standard environment. The core defect of this method is that the test period is as long as 24 hours or more, and it needs to rely on professional laboratory equipment and controlled environment, which results in low efficiency of determining the deformation resistance of the foam core mold and cannot meet the timeliness requirements of material acceptance at the construction site. SUMMARY

[0004] Therefore, the embodiments of the present application provide a method and device for determining the deformation resistance of a foam core mold, an electronic device, and a medium, which improve the efficiency of determining the deformation resistance of the foam core mold through on-site rapid testing and model-based determination.

[0005] The present application mainly includes the following aspects: In a first aspect, the embodiments of the present application provide a method for determining the deformation resistance of a foam core mold, which comprises: obtaining the apparent density and at least one rapid test index of the foam core mold to be tested; the rapid test index is a field measurable parameter having a statistical correlation with the standard compression permanent deformation rate; inputting the apparent density and the rapid test index into a qualified determination model corresponding to the type of the foam core mold to be tested, to obtain a qualified determination result of the foam core mold to be tested; the qualified determination model comprises a first mapping relationship and a second mapping relationship; the first mapping relationship is a mapping relationship between the apparent density and the compression strength, and the second mapping relationship is a mapping relationship between the rapid test index and the standard compression permanent deformation rate; determining whether the deformation resistance of the foam core mold to be tested is qualified according to the qualified determination result of the foam core mold to be tested.

[0006] Secondly, embodiments of this application also provide a device for determining the deformation resistance of a foam core mold, the device comprising: The data acquisition module is used to acquire the apparent density of the foam core mold to be tested and at least one rapid test index; the rapid test index is a field-measurable parameter that has a statistical correlation with the standard compression set. The model processing module is used to input the apparent density and the rapid test index into the qualified judgment model corresponding to the type of the foam core mold to be tested, and to obtain the qualified judgment result of the foam core mold to be tested; the qualified judgment model includes a first mapping relationship and a second mapping relationship; the first mapping relationship is the mapping relationship between apparent density and compressive strength, and the second mapping relationship is the mapping relationship between rapid test index and standard compression set. The determination output module is used to determine whether the deformation resistance of the foam core mold under test is qualified based on the qualification determination result of the foam core mold under test.

[0007] Thirdly, embodiments of this application also provide an electronic device, including: a processor, a memory, and a bus. The memory stores machine-readable instructions executable by the processor. When the electronic device is running, the processor communicates with the memory through the bus. The machine-readable instructions are executed by the processor to perform the steps of the method for determining the deformation resistance of a foam core mold as described above.

[0008] Fourthly, embodiments of this application also provide a computer-readable storage medium storing a computer program, which, when executed by a processor, performs the steps of the method for determining the deformation resistance of a foam core mold as described above.

[0009] The present application provides a method, apparatus, electronic device, and medium for determining the deformation resistance of foam core molds. These methods acquire the apparent density and at least one rapid testing index of the foam core mold to be tested. The rapid testing index is a field-measurable parameter that has a statistical correlation with the standard compression set. The apparent density and rapid testing index are input into a pre-constructed qualification model corresponding to the type of the foam core mold to be tested, resulting in a qualification judgment result. The qualification judgment model includes a first mapping relationship and a second mapping relationship. The first mapping relationship is a mapping relationship between apparent density and compressive strength, and the second mapping relationship is a mapping relationship between the rapid testing index and the standard compression set. Based on the qualification judgment result of the foam core mold to be tested, the deformation resistance of the foam core mold to be tested is determined to be qualified. Thus, by combining rapid field testing with model-based judgment, the efficiency of determining the deformation resistance of foam core molds is improved.

[0010] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0011] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 A flowchart illustrating a method for determining the deformation resistance of a foam core mold according to an embodiment of this application is shown; Figure 2 This illustration shows one of the functional block diagrams of a device for determining the deformation resistance of a foam core mold according to an embodiment of this application; Figure 3 This is a second functional block diagram of a device for determining the deformation resistance of a foam core mold provided in an embodiment of this application; Figure 4 A schematic diagram of the structure of an electronic device provided in an embodiment of this application is shown. Detailed Implementation

[0013] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0014] In order to enable those skilled in the art to use the content of this application, and in conjunction with the specific application scenario of "determining the deformation resistance of polystyrene foam core mold", the following implementation method is given. For those skilled in the art, the general principles defined herein can be applied to other embodiments and application scenarios without departing from the spirit and scope of this application.

[0015] To facilitate understanding of this application, the technical solutions provided in this application will be described in detail below with reference to specific embodiments.

[0016] Please see Figure 1 , Figure 1 A flowchart illustrating a method for determining the deformation resistance of a foam core mold, as provided in an embodiment of this application. Figure 1 As shown in the embodiments of this application, the method for determining the deformation resistance of a foam core mold includes the following steps: S101, Obtain the apparent density of the foam core mold to be tested and at least one rapid test index; the rapid test index is a field-measurable parameter that has a statistical correlation with the standard compression set.

[0017] Here, apparent density is a fundamental physical indicator of foam materials, and its magnitude directly affects the initial mechanical properties of the material. Rapid testing indicators are key to achieving rapid evaluation in this scheme. These specifically refer to parameters that can be quickly measured using on-site instruments, and whose measurement results have a verified and reliable statistical relationship with the standard compressive strength obtained through long-term aging tests in a standard laboratory. Obtaining these two parameters forms the data foundation for subsequent intelligent judgment using the model.

[0018] In this embodiment, the implementer needs to obtain a representative sample directly from the foam core mold product to be inspected at the engineering site. The apparent density of the sample can be quickly determined using conventional field measuring tools (such as electronic scales, rulers, or a dedicated portable densitometer). Simultaneously, a pre-configured field rapid testing device is used to apply a pre-set, brief mechanical test to the sample, thereby instantly obtaining the value of the rapid test index.

[0019] A rapid field testing device is an integrated portable equipment for enabling rapid field testing. It typically includes a pressure application module (such as an electric actuator), a force sensing module (such as a strain gauge force sensor), a displacement measurement module (such as a linear encoder), and a central processing module (such as an embedded microprocessor). The central processing module has built-in data processing algorithms that can synchronously acquire force and displacement signals in real time, plot pressure-displacement curves, and automatically calculate rapid testing indicators (such as the energy recovery coefficient) through numerical integration and display the results, thereby achieving rapid and automated field testing.

[0020] S102, input the apparent density and the rapid test index into the qualified judgment model corresponding to the type of the foam core mold to be tested, and obtain the qualified judgment result of the foam core mold to be tested; the qualified judgment model includes a first mapping relationship and a second mapping relationship; the first mapping relationship is the mapping relationship between apparent density and compressive strength, and the second mapping relationship is the mapping relationship between rapid test index and standard compression set.

[0021] Here, the qualification assessment model is a set of data processing rules embedded with a first mapping relationship and a second mapping relationship for a specific type of foam core mold. When a set of specific values ​​for apparent density and rapid test indicators are input, the model performs the following key operations based on its two internal mapping relationships: According to the engineering strength requirements associated with the first mapping relationship, it outputs a comparison result for the current input apparent density, such as whether it falls within a preset qualified density range; simultaneously, according to the long-term performance qualification standards associated with the second mapping relationship, it outputs a comparison result for the current input rapid test indicators, such as whether they reach or exceed a preset qualified threshold. These specific, paired comparison results together constitute the qualification assessment result, providing clear, rule-based data support for the final assessment.

[0022] In this embodiment, the model is integrated into a portable judgment device or system as a software algorithm. The operator inputs the measured density value (e.g., 22.5 kg / m³) and the rapid test index value (e.g., 0.68). The model calls pre-stored relevant parameters (e.g., the upper and lower limits of the density acceptable range and the index acceptable threshold for this type of core mold), performs numerical comparison, and outputs structured data pairs such as "density comparison status: within range / outside range" and "index comparison status: reached threshold / not reached threshold", or directly outputs the calculated quantitative comparison information such as "density range compliance" and "index threshold compliance".

[0023] S103, based on the qualification judgment result of the foam core mold to be tested, determine whether the deformation resistance of the foam core mold to be tested is qualified.

[0024] Here, the input received in this step is explicit comparison information generated by the S102 model calculation (such as whether the apparent density is within the preset acceptable range, and whether the rapid test indicators have reached the preset acceptable threshold). This step, based on pre-set judgment rules, transforms the data-driven intermediate results output by the model into clearly directional quality control conclusions required for project acceptance.

[0025] In this embodiment, on-site personnel or an automated judgment system read the comparison results output in step S102. For example, when the system interface or report displays "Apparent density: 20.5 kg / m³, Conclusion: Within the acceptable range (18-30 kg / m³)" and "Rapid test index (energy recovery coefficient): 0.58, Conclusion: Not reaching the acceptable threshold (≥0.65)," according to the above judgment rules, since the rapid test index does not reach the threshold, the system or personnel will ultimately determine that the core mold under test has "unacceptable deformation resistance." Conversely, if the results show that both density and index meet the conditions, it will ultimately be determined as "acceptable deformation resistance." This step is the final decision point for quality acceptance, ensuring that the judgment conclusion comes directly and uniquely from the combination of the model comparison results and the established rules.

[0026] Further, a pass / fail determination model corresponding to the type of the foam core mold to be tested is constructed according to the following steps: Step a1: Obtain multiple batches of foam core sample templates that are the same type as the foam core mold to be tested.

[0027] To ensure that the constructed model accurately reflects the general performance characteristics of this type of foam core molding material, it is necessary to collect multiple batches and samples from multiple sources covering a sufficiently broad performance range (especially key parameters such as apparent density). These samples should come from different production batches or suppliers to encompass the normal fluctuations that may exist in the material itself, thereby enabling the model built based on this sample set to have good generalization ability and be applicable to various similar products that may be encountered during subsequent acceptance testing.

[0028] In this embodiment, core sample samples of the target type (such as polystyrene foam used for precast beams and slabs) can be collected from products from multiple manufacturers or from different production cycles of the same manufacturer. The number of samples should be statistically significant, for example, collecting more than a dozen independent samples, and their apparent density should cover as much as possible the density range commonly used in engineering for this type of material (e.g., from about 15 kg / m³ to 30 kg / m³) to ensure that the established correlation is valid throughout the entire application range.

[0029] Step a2: Test the apparent density, compressive strength, standard compression set, and other rapid test parameters of each foam core sample.

[0030] This step involves conducting comprehensive standardized performance tests on the samples to obtain all the fundamental data needed to establish the two core mapping relationships. The tests for apparent density and compressive strength aim to obtain data reflecting the material's basic mechanical properties; the test for standard compressive set aims to obtain authoritative benchmark values ​​for evaluating the material's long-term resistance to deformation; and the tests for rapid testing indicators aim to obtain field-measurable parameter values ​​for correlation analysis with the aforementioned benchmark values. The simultaneous and accurate testing of these four parameters is a prerequisite for subsequent scientific correlation analysis.

[0031] In this embodiment of the application, under a controlled laboratory environment, four tests are performed on each sample: its apparent density is tested according to national standards (such as GB / T 6343); its compressive strength is tested according to the standard for testing the compressive properties of foamed plastics (such as GB / T 8813); its standard compression set is tested according to the standard accelerated aging compression set test method (such as ASTM D3574 Test D); and at the same time, the sample is rapidly tested using the same or consistent testing methods as those planned for the field to obtain laboratory measurements of its rapid test indicators (such as energy recovery coefficient).

[0032] Step a3: Based on the apparent density and compressive strength of each foam core sample, establish the first mapping relationship, and determine the acceptable range of the apparent density according to the minimum compressive strength requirement and economic requirements of the project.

[0033] First, a quantitative correspondence, the first mapping relationship, is established between the density and compressive strength data of all samples through statistical analysis (such as linear or nonlinear regression). Then, specific engineering requirements are transformed into technical constraints based on this relationship: the minimum compressive strength required for the project is determined based on the lateral concrete pressure that the core mold needs to withstand during the precast beams. Using the established first mapping relationship, the minimum apparent density corresponding to meeting this strength requirement is derived and used as the lower limit of the acceptable range. Simultaneously, a reasonable upper limit for density is set, taking into account economic factors such as material costs, to prevent waste caused by the excessive use of high-density materials. The upper and lower limits together constitute the acceptable range for apparent density.

[0034] In this embodiment, the density (X-axis) and corresponding compressive strength (Y-axis) data of all samples are plotted as a scatter plot and fitted to obtain the fitting equation. Let the minimum compressive strength required for the project be... Substituting into the equation, we can obtain the corresponding density value. This is the lower limit of the acceptable range. Combining the industry-standard upper density limit with cost analysis, an economically reasonable density value is set. This serves as the upper limit. The final acceptable range for apparent density is... .

[0035] For example, a positive correlation between apparent density and compressive strength was established by performing linear regression analysis on test data from 16 polystyrene foam core samples. Based on engineering requirements, the minimum compressive strength was determined to be 150 kPa, from which the lower limit of apparent density was derived to be 18 kg / m³. Considering economic factors, the upper limit of density was set at 30 kg / m³, thus obtaining the acceptable range of apparent density as [18, 30] kg / m³.

[0036] Step a4: Based on the rapid test index and standard compression set test data of each foam core sample, establish the second mapping relationship, and determine the qualified threshold of the rapid test index according to the preset qualified limit of standard compression set.

[0037] Here, statistical analysis is performed on the rapid test index values ​​and corresponding standard compressive settling rate values ​​of all samples to reveal the correlation between the two and establish a statistical model that can be used for prediction, namely the second mapping relationship (e.g., the higher the rapid test index value, the lower the standard compressive settling rate). Then, an acceptable standard compressive settling rate qualification limit (e.g., C≤5%) is preset according to engineering specifications or quality requirements. Based on the established second mapping relationship, the minimum critical value of the rapid test index that can ensure (or ensure with a high probability) that the standard compressive settling rate does not exceed the qualification limit is found. This critical value is determined as the qualification threshold of the rapid test index.

[0038] In this embodiment of the application, all samples' rapid test index values ​​(such as energy recovery coefficient) are included. A correlation analysis was performed between the data and the standard compressive settling rate (C). By observing the data distribution or establishing a regression model, it was found that... There is a negative correlation with C. Setting the acceptable threshold for C to 5%, we filter the dataset to find all samples where C ≤ 5%, and identify the... The minimum value, or the value corresponding to C=5% calculated through a statistical model. The predicted value (or a value slightly higher after considering a certain safety margin) is determined as the pass threshold for the rapid testing indicator. .

[0039] In a specific experiment, analysis of 16 samples revealed that all energy recovery coefficients... For samples with a strength ≥0.65, the standard compressive setpoint C is ≤5%; all For samples with a coefficient of restitution <0.65, all have a C >5%, indicating extremely high discrimination. Therefore, the acceptable threshold for determining the coefficient of restitution K_A is determined. It is 0.65.

[0040] Furthermore, the testing of the apparent density, compressive strength, standard compression set, and rapid test parameters of each foam core sample includes: Step b1: According to the national standard for testing the apparent density of foamed plastics, the apparent density of each foam core sample is obtained by testing.

[0041] Here, this step involves measuring the apparent density of the foam core sample according to national standards. Adopting national standards ensures the authority of the testing methods, consistency of operations, and the comparability and credibility of the test results; this forms the data quality foundation for constructing a reliable performance correlation model. Accurate measurement of apparent density provides crucial input for subsequent analysis of its relationship with compressive strength.

[0042] In this embodiment, the apparent density of foamed plastics is measured according to the national standard for testing apparent density (e.g., GB / T 6343). The mass of the sample is measured using an electronic balance with the required accuracy, and the dimensions and volume are measured using measuring tools such as vernier calipers. Finally, the apparent density of each sample is calculated as the ratio of mass to volume, in kilograms per cubic meter (kg / m³).

[0043] Step b2: According to the national standard for testing the compressibility of foamed plastics, the compressibility strength of each foam core sample is tested and obtained.

[0044] Here, the compressive strength of the foam core sample is tested according to national unified standards. Compressive strength is an important indicator for evaluating the load-bearing capacity of foam materials when they resist external pressure until a certain deformation occurs. The purpose of obtaining this data is to establish and verify the intrinsic correlation (first mapping relationship) between the two, together with the apparent density data, thereby providing a basis for deriving strength performance from density.

[0045] In this embodiment, the compressive properties of rigid foamed plastics are tested using standard equipment such as an electronic universal testing machine, in accordance with the national standard for testing rigid foamed plastics (e.g., GB / T 8813). The specimen is placed on the testing machine platform, and a compressive load is applied at a specified constant rate, and the load-displacement curve is recorded. Typically, the compressive stress value corresponding to the specimen being compressed to 10% of its original thickness is taken as the reported compressive strength value of the sample, in kilopascals (kPa).

[0046] Step b3: According to the standard accelerated aging compression set test method, the standard compression set rate of each foam core pattern is obtained by testing.

[0047] Here, based on internationally or industry-recognized standard accelerated aging test methods, core performance indicators for evaluating the long-term deformation resistance of foam core molds, as well as the standard compression set rate, are obtained. This method simulates the performance degradation of materials under long-term use conditions through accelerated conditions such as high temperature and constant pressure. This indicator is crucial for evaluating whether the core mold can guarantee the long-term structural safety of the slab beam, and it also serves as the benchmark target value for establishing a predictive model through correlation analysis with rapid on-site test indicators.

[0048] In this embodiment, the test is conducted according to a widely accepted standard accelerated aging compression set test method (e.g., Test D in ASTM D3574). The specimen is compressed to a preset deformation (e.g., 50% of the original thickness) at a specific temperature (e.g., 70°C) and held for a specified time (e.g., 22 hours). The pressure is then released, allowing the specimen to recover for a specified time (e.g., 30 minutes) under standard laboratory conditions. Finally, the residual deformation is measured, and the permanent deformation rate relative to the initial deformation is calculated, which is used as the standard compression set rate for the specimen.

[0049] Step b4: Based on the on-site simulation rapid test, obtain the rapid test indicators of each foam core sample.

[0050] Here, a rapid mechanical test simulating field application conditions is used to obtain an index that characterizes the specific response properties of the foam material. The core design of this test is to establish a potential quantifiable correlation between its response (i.e., the rapid test index) and the standard compression set obtained in step b3. This index data is obtained for statistical analysis with the standard compression set data, aiming to discover and establish a second mapping relationship that can be used for rapid prediction of long-term performance in the field.

[0051] In this embodiment, the same testing apparatus or method as that planned for field application is used to test the samples in the laboratory. For example, a compression-unloading cyclic mechanical test is performed on the sample, and sensors are used to record the force and displacement data throughout the test, generating a pressure-displacement curve. By performing specific analysis and calculations on this curve (e.g., calculating the energy recovery ratio, analyzing the slope characteristics of the unloading curve, etc.), a dimensionless or physically meaningful parameter value is derived, which serves as a rapid testing indicator for the sample. This testing process needs to be much faster than standard aging tests, typically completed within a few minutes.

[0052] In a preferred embodiment of this application, when the rapid testing index is the energy recovery coefficient, the step of obtaining the rapid testing index of each foam core sample based on on-site simulated rapid testing includes: Step c1: Perform a compression-unloading cycle test on the sample of the foam core pattern and record the pressure-displacement curve during the test.

[0053] Here, a complete loading-unloading mechanical cycle is performed on a standard specimen to simulate the critical process of the mandrel bearing and releasing the lateral pressure of concrete during casting. Pressure and displacement data are recorded throughout the process to capture the complete mechanical response of the foam material in this dynamic process, providing raw data for subsequent calculations of energy parameters. The pressure-displacement curves can intuitively reflect the material's stiffness, yield characteristics, and elastic recovery ability.

[0054] In this embodiment, the test is performed using an electronic universal testing machine or a dedicated material testing device. A prepared standard specimen (e.g., a cube with dimensions of 50mm × 50mm × 50mm) is placed at the center of the testing machine's pressure plate. The specimen is compressed at a constant rate (e.g., 10 mm / min) until a preset compression displacement is reached (e.g., reducing the specimen height by 25%, i.e., generating 25% compressive strain). Immediately afterwards, the specimen is unloaded by reversing the movement at the same rate until the pressure is significantly reduced. Throughout the process, the device synchronously and continuously records the applied pressure (or load) and the displacement data of the pressure plate, forming a complete pressure-displacement closed curve.

[0055] Step c2: Based on the pressure-displacement curve, determine the loading energy input during the compression of the sample to the preset displacement and the rebound energy released by the sample during the unloading process.

[0056] This step is the core of the quantitative analysis of the test data. Its purpose is to quantify the differences in material behavior from the perspective of macroscopic mechanical work. Loading energy refers to the mechanical work done on the material to compress the sample to a predetermined deformation; it includes the total energy consumed to overcome the material's elasticity, viscosity, and potential plastic deformation. Springback energy refers to the work done by the release of the elastic potential energy stored within the material during unloading. These two energy values ​​are obtained by calculating the area enclosed by the pressure-displacement curve and the displacement axis at the corresponding stages. Their physical meaning is clear, and they are direct inputs for calculating the energy recovery coefficient.

[0057] In this embodiment, the pressure-displacement curve data recorded in step c1 is obtained. In the data processing software or the instrument's built-in program, the starting point (displacement is 0, pressure is 0) and the ending point (preset displacement point) of the loading stage are first determined on the curve. The area under this curve segment is calculated using a numerical integration method (such as the trapezoidal rule), and this area value represents the loading energy. Similarly, by determining the starting point (preset displacement point) and ending point (e.g., pressure dropping to a low threshold point during the initial loading stage) of the unloading phase, the area under the curve segment is calculated; this area value represents the rebound energy. The units for both types of energy are usually millijoules (mJ) or joules (J).

[0058] Step c3: Calculate the ratio of the rebound energy to the loading energy, which is used as the energy recovery coefficient of the foam core pattern.

[0059] Here, the two independent energy values ​​of loading and unloading are combined into a single, dimensionless evaluation index, namely the energy recovery coefficient. This coefficient ( The physical meaning of the energy recovery coefficient (ERC) lies in its representation of the proportion of mechanical energy that a material can store and release as elastic potential energy during a single compression-unloading cycle. A higher ERC indicates stronger elastic recovery properties and less unrecoverable dissipated energy accumulated under the same deformation. As a rapid testing indicator, the validity of this coefficient is based on a significant statistical negative correlation with the standard compressive settling rate (C), meaning that materials with a high ERC generally have stronger long-term resistance to permanent deformation.

[0060] In this embodiment of the application, the rebound energy calculated in step c2 is... Divided by loaded energy That is, the energy recovery coefficient of the sample is obtained. For example, if = 45mJ, =70 mJ, then = 45 / 70≈0.643. This coefficient is a pure number between 0 and 1, which comprehensively reflects the elastic recovery ability of foam materials under specific test conditions and is used as a key rapid parameter for predicting their long-term deformation resistance.

[0061] In a preferred embodiment of this application, the preset displacement is a displacement that causes the specimen to produce a compressive strain of 20% to 30%.

[0062] Here, the preset displacement is defined as the displacement that produces 20% to 30% compressive strain. This is based on a balance between the actual engineering stress characteristics of the foam core mold and the effectiveness of material testing. This strain range ensures that the specimen produces a sufficiently significant and accurately measurable mechanical response, thereby clearly distinguishing the energy recovery characteristics of different samples. At the same time, this range is controlled within the deformation range dominated by the material's typical linear elasticity or viscoelasticity, avoiding the possibility that the material may enter an irreversible plastic yielding stage due to excessive strain, thus ensuring the energy recovery coefficient. The consistency of the physical meaning of the calculations and the stability of the correlation between them and the long-term resistance to permanent deformation (standard compressive settling rate C).

[0063] In this embodiment, the displacement required to generate the target compressive strain is calculated based on the initial height of the prepared standard specimen. For example, for a cubic specimen with an initial height of 50 mm, the preset displacement should be set to 12.5 mm to generate 25% compressive strain. In the actual test setup, the end point of the compression stroke of the testing machine is set to the calculated displacement value. Preferably, testing within this 20% to 30% strain range ensures that effective, comparable, and strongly correlated energy recovery coefficient data with long-term performance can be obtained for foam samples of different batches and densities.

[0064] In a preferred embodiment of this application, the loading rate of the compression-unloading cycle test is the same as the unloading rate, and the rate range is from 5 mm / min to 20 mm / min.

[0065] Here, this step explicitly specifies the motion speed during the test. Specifying that the loading rate and unloading rate are the same ensures the symmetry of the mechanical cycle, allowing the work done on the sample during loading (input energy) and the work released by the sample during unloading (rebound energy) to be converted and compared under the same rate conditions, thus guaranteeing the final calculated energy recovery coefficient. The accuracy and consistency with the physical meaning are ensured. Limiting the rate range to 5 mm / min to 20 mm / min is to keep the test within the quasi-static or low-speed testing range widely recognized in materials mechanics testing standards. Within this rate range, the testing process is smooth, the viscoelastic response of the material is fully demonstrated, and interference from inertial effects or heat accumulation that may be caused by high-speed loading is avoided, ensuring the stability, repeatability, and comparability of data between different laboratories or equipment.

[0066] In this embodiment, when operating the testing machine or dedicated testing equipment, the movement rate of the loading drive unit is set to a specific constant value within the aforementioned range, such as 10 mm per minute. This rate remains constant throughout the loading and unloading phases of a single test. Testing at this rate allows a complete compression-unloading cycle to be completed within a reasonable time (typically a few minutes), while simultaneously obtaining high-quality, low-noise pressure-displacement curve data, laying a reliable foundation for subsequent accurate calculation of the energy recovery coefficient.

[0067] Further, determining whether the deformation resistance of the foam core mold to be tested is qualified based on the qualification judgment result of the foam core mold to be tested includes: Step d1: If the apparent density of the foam core mold to be tested is within the acceptable range of the apparent density, and the rapid test index of the foam core mold to be tested is greater than or equal to the acceptable threshold of the rapid test index, then the deformation resistance of the foam core mold to be tested is determined to be acceptable.

[0068] This step defines the necessary and sufficient conditions and specific logic for determining whether the deformation resistance is qualified. This judgment rule is established in advance through laboratory correlation studies and has clear scientific basis: the apparent density is within the qualified range, ensuring that the mandrel possesses the basic compressive strength required for engineering and can resist the initial lateral pressure during concrete pouring; simultaneously, if the rapid test index reaches or exceeds its qualified threshold, then based on the established statistical relationship, the standard compressive permanent deformation rate of the mandrel under long-term pressure is predicted to meet the preset qualified limit (e.g., C≤5%). Only when both conditions are met simultaneously does it mean that the mandrel under test meets the requirements in both short-term load-bearing capacity and long-term deformation resistance, thus allowing for a final qualified judgment.

[0069] In this embodiment, the operator or the automatic determination system receives the specific comparison results output in step S102. For example, the system interface displays "Apparent density: 24.0 kg / m³, Status: Within the acceptable range (18-30 kg / m³)" and "Rapid test index (energy recovery coefficient): 0.70, Status: Reached the acceptable threshold (≥0.65)". Since both conditions are positive, according to the rules of this step, the deformation resistance of the foam core mold under test is immediately determined to be acceptable.

[0070] Step d2, otherwise, determine that the deformation resistance of the foam core mold to be tested is unqualified.

[0071] Here, this step defines a unified processing rule for all other results besides those described in step d1, which are judged as unqualified. This rule is logically complementary and exclusive. This step is triggered if either of the following conditions is not met: apparent density within the acceptable range or rapid test index greater than or equal to the acceptable threshold. This could be due to insufficient foundation strength caused by excessively low density, or low rapid test index indicating excessive long-term deformation rate, or both. The purpose of making an unqualified judgment is to strictly intercept any mandrel with quality risks in any aspect, thereby eliminating the structural safety hazard of insufficient thickness of the top plate of the beam due to excessive permanent deformation of the mandrel from the source.

[0072] In this embodiment of the application, this step is triggered when the comparison result output in step S102 shows that any condition is not met. For example, if result 1 shows "apparent density: 16.5 kg / m³, status: below the lower limit of the qualified range (18 kg / m³)", or result 2 shows "rapid test index (energy recovery coefficient): 0.58, status: not reaching the qualified threshold (≥0.65)", or both occur simultaneously. Regardless of the specific situation, according to the rules of this step, it will be immediately determined that the deformation resistance of the foam core mold under test is unqualified.

[0073] To verify the effectiveness of the method in this application, two specific examples are provided below.

[0074] Example 1 (Determination of Non-conformity): A rapid on-site evaluation was conducted on a batch of core molds used for the prefabrication of 13m hollow slab beams for a certain highway. After on-site sampling, the average apparent density was measured. kg / m³, average energy recovery coefficient =0.58. The data was input into the polystyrene foam core mold qualification model. The model comparison results showed that the density of 20.5 kg / m³ was within the acceptable range [18,30] kg / m³, but the energy recovery coefficient of 0.58 was less than the acceptable threshold of 0.65. According to the judgment rules, the deformation resistance of this batch of core molds was deemed unqualified. To verify this, the laboratory conducted a verification test according to ASTM D3574 Test D standard, and the measured compression set C = 7.2% > 5%, confirming the unqualified status. The total time for this on-site evaluation was approximately 8 minutes.

[0075] Example 2 (Qualification Judgment): A rapid on-site evaluation was conducted on another batch of core molds arriving for the same project. The average apparent density was measured. =24.0 kg / m³, average energy recovery coefficient =0.70. The model comparison results are: density 24.0 kg / m³ is within the acceptable range, and energy recovery coefficient 0.70 is greater than or equal to the acceptable threshold of 0.65. According to the judgment rules, the deformation resistance of this batch of core molds is judged to be qualified. The laboratory verification test measured C=3.8%<5%, which meets the qualified standard. The total time for this on-site evaluation was approximately 7.5 minutes.

[0076] The above examples demonstrate that the method of this application can complete on-site evaluation within 10 minutes, and the results are consistent with the conclusions of standard long-term aging tests, achieving efficient and accurate on-site screening.

[0077] This application provides a method for determining the deformation resistance of a foam core mold, comprising: acquiring the apparent density and at least one rapid testing index of the foam core mold to be tested; the rapid testing index being a field-measurable parameter statistically correlated with the standard compression set; inputting the apparent density and the rapid testing index into a pre-constructed qualification judgment model corresponding to the type of the foam core mold to be tested, and obtaining a qualification judgment result for the foam core mold to be tested; the qualification judgment model includes a first mapping relationship and a second mapping relationship; the first mapping relationship is a mapping relationship between apparent density and compressive strength, and the second mapping relationship is a mapping relationship between the rapid testing index and the standard compression set; and determining whether the deformation resistance of the foam core mold to be tested is qualified based on the qualification judgment result. Thus, by combining rapid field testing with model-based judgment, the efficiency of determining the deformation resistance of the foam core mold is improved.

[0078] Based on the same application concept, this application also provides a device for determining the deformation resistance of a foam core mold, which corresponds to the method for determining the deformation resistance of a foam core mold provided in the above embodiments. Since the principle of the device in this application is similar to the method for determining the deformation resistance of a foam core mold in the above embodiments of this application, the implementation of the device can refer to the implementation of the method, and the repeated parts will not be described again.

[0079] Please see Figure 2 , Figure 2 This is one of the functional block diagrams of a device for determining the deformation resistance of a foam core mold provided in an embodiment of this application. Figure 2 As shown, the apparatus 200 for determining the deformation resistance of a foam core mold provided in this application embodiment includes: The data acquisition module 210 is used to acquire the apparent density of the foam core mold to be tested and at least one rapid test index; the rapid test index is a field-measurable parameter that has a statistical correlation with the standard compression set.

[0080] The model processing module 220 is used to input the apparent density and the rapid test index into the qualified judgment model corresponding to the type of the foam core mold to be tested, and to obtain the qualified judgment result of the foam core mold to be tested; the qualified judgment model includes a first mapping relationship and a second mapping relationship; the first mapping relationship is the mapping relationship between apparent density and compressive strength, and the second mapping relationship is the mapping relationship between rapid test index and standard compression set.

[0081] The determination output module 230 is used to determine whether the deformation resistance of the foam core mold under test is qualified based on the qualification determination result of the foam core mold under test.

[0082] Further, please refer to Figure 3 , Figure 3 This is a second functional block diagram of a device for determining the deformation resistance of a foam core mold provided in an embodiment of this application. Figure 3 As shown, the device 200 for determining the deformation resistance of foam core molds further includes: The sample acquisition module 240 is used to acquire multiple batches of foam core sample that are the same type as the foam core mold to be tested.

[0083] The sample testing module 250 is used to test the apparent density, compressive strength, standard compression set, and rapid test indicators of each foam core sample.

[0084] The first modeling module 260 is used to establish the first mapping relationship based on the apparent density and compressive strength of each foam core sample, and to determine the acceptable range of the apparent density based on the minimum compressive strength requirement and the economic requirements of the project.

[0085] The second modeling module 270 is used to establish the second mapping relationship based on the rapid test index and standard compression set test data of each foam core sample, and to determine the qualified threshold of the rapid test index based on the preset qualified limit of standard compression set.

[0086] Furthermore, when testing the apparent density, compressive strength, standard compression set, and the aforementioned rapid test indicators of each foam core sample, the sample testing module 250 is specifically used for: The apparent density of each foam core sample was obtained by testing according to the national standard for testing the apparent density of foamed plastics. The compressive strength of each foam core sample was obtained by testing according to the national standard for testing the compressive properties of foamed plastics. The standard compression set rate of each foam core sample was obtained by testing according to the standard accelerated aging compression set test method. Based on on-site simulation rapid testing, rapid test indicators for each foam core sample were obtained.

[0087] In a preferred embodiment of this application, when the rapid test index is the energy recovery coefficient, the sample test module 250, when used to obtain the rapid test index of each foam core sample based on on-site simulation rapid testing, is specifically used for: The foam core pattern specimens were subjected to compression-unloading cycle tests, and the pressure-displacement curves during the test were recorded. Based on the pressure-displacement curve, the loading energy input during the compression of the sample to the preset displacement and the rebound energy released by the sample during the unloading process are determined respectively. The ratio of the rebound energy to the applied energy is calculated and used as the energy recovery coefficient of the foam core pattern.

[0088] Furthermore, when determining whether the deformation resistance of the foam core mold under test is qualified based on the qualification determination result of the foam core mold under test, the determination output module 230 is specifically used for: If the apparent density of the foam core mold to be tested is within the acceptable range of the apparent density, and the rapid test index of the foam core mold to be tested is greater than or equal to the acceptable threshold of the rapid test index, then the deformation resistance of the foam core mold to be tested is determined to be acceptable. Otherwise, the deformation resistance of the foam core mold to be tested is determined to be unqualified.

[0089] This application provides an apparatus for determining the deformation resistance of a foam core mold, comprising: a data acquisition module for acquiring the apparent density and at least one rapid test index of the foam core mold to be tested; the rapid test index is a field-measurable parameter that has a statistical correlation with the standard compression set; a model processing module for inputting the apparent density and the rapid test index into a pre-constructed qualification judgment model corresponding to the type of the foam core mold to be tested, and obtaining a qualification judgment result for the foam core mold to be tested; the qualification judgment model includes a first mapping relationship and a second mapping relationship; the first mapping relationship is a mapping relationship between apparent density and compressive strength, and the second mapping relationship is a mapping relationship between the rapid test index and the standard compression set; and a judgment output module for determining whether the deformation resistance of the foam core mold to be tested is qualified based on the qualification judgment result of the foam core mold to be tested. Thus, by combining rapid field testing with model-based judgment, the efficiency of determining the deformation resistance of the foam core mold is improved.

[0090] Based on the same application concept, please refer to Figure 4 , Figure 4 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. Figure 4 As shown, the electronic device 400 includes a processor 410, a memory 420, and a bus 430.

[0091] The memory 420 stores machine-readable instructions that can be executed by the processor 410. When the electronic device 400 is running, the processor 410 and the memory 420 communicate through the bus 430. When the machine-readable instructions are executed by the processor 410, the steps of the method for determining the deformation resistance of the foam core mold provided in the above embodiment are executed. For specific implementation, please refer to the method embodiment, which will not be repeated here.

[0092] Based on the same concept, this application also provides a computer-readable storage medium storing a computer program. When the computer program is run by a processor, it executes the steps of the method for determining the deformation resistance of the foam core mold provided in the above embodiments. For specific implementation details, please refer to the method embodiments, which will not be repeated here.

[0093] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working process of the above-described apparatus and unit can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0094] In the embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. The apparatus embodiments described above are merely illustrative. For example, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. Furthermore, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Additionally, the displayed or discussed mutual couplings, direct couplings, or communication connections may be through some communication interfaces; indirect couplings or communication connections between devices or units may be electrical, mechanical, or other forms.

[0095] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0096] In addition, the functional units in the embodiments provided in this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0097] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0098] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In addition, the terms "first", "second", "third", etc. are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0099] Finally, it should be noted that the above-described embodiments are merely specific implementations of this application, used to illustrate the technical solutions of this application, and not to limit them. The protection scope of this application is not limited thereto. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the scope of the technology disclosed in this application; and these modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application. All should be covered within the protection scope of this application. Therefore, the protection scope of this application should be determined by the protection scope of the claims.

Claims

1. A method for determining the deformation resistance of a foam core mold, characterized in that, The method includes: Obtain the apparent density and at least one rapid test index of the foam core mold to be tested; the rapid test index is a field-measurable parameter that has a statistical correlation with the standard compression set. The apparent density and the rapid test index are input into the qualified judgment model corresponding to the type of the foam core mold to be tested, and the qualified judgment result of the foam core mold to be tested is obtained. The qualified judgment model includes a first mapping relationship and a second mapping relationship. The first mapping relationship is the mapping relationship between apparent density and compressive strength, and the second mapping relationship is the mapping relationship between rapid test index and standard compression set. Based on the qualification results of the foam core mold to be tested, it is determined whether the deformation resistance of the foam core mold to be tested is qualified.

2. The method for determining the deformation resistance of a foam core mold according to claim 1, characterized in that, Construct a pass / fail determination model corresponding to the type of foam core mold to be tested according to the following steps: Obtain multiple batches of foam core sample specimens that are the same type as the foam core mold to be tested; The apparent density, compressive strength, standard compression set, and other rapid test parameters of each foam core sample were tested. Based on the apparent density and compressive strength of each foam core sample, the first mapping relationship is established, and the acceptable range of the apparent density is determined according to the minimum compressive strength requirement and the economic requirements of the project. Based on the rapid test indicators and standard compression set test data of each foam core sample, a second mapping relationship is established, and the qualified threshold of the rapid test indicators is determined according to the preset qualified limit of standard compression set.

3. The method for determining the deformation resistance of a foam core mold according to claim 2, characterized in that, The tests for the apparent density, compressive strength, standard compression set, and rapid test parameters of each foam core sample include: The apparent density of each foam core sample was obtained by testing according to the national standard for testing the apparent density of foamed plastics. The compressive strength of each foam core sample was obtained by testing according to the national standard for testing the compressive properties of foamed plastics. The standard compression set rate of each foam core sample was obtained by testing according to the standard accelerated aging compression set test method. Based on on-site simulation rapid testing, rapid test indicators for each foam core sample were obtained.

4. The method for determining the deformation resistance of a foam core mold according to claim 3, characterized in that, When the rapid test index is the energy recovery coefficient, the rapid test index for each foam core sample obtained based on on-site simulated rapid testing includes: The foam core pattern specimens were subjected to compression-unloading cycle tests, and the pressure-displacement curves during the test were recorded. Based on the pressure-displacement curve, the loading energy input during the compression of the sample to the preset displacement and the rebound energy released by the sample during the unloading process are determined respectively. The ratio of the rebound energy to the applied energy is calculated and used as the energy recovery coefficient of the foam core pattern.

5. The method for determining the deformation resistance of a foam core mold according to claim 4, characterized in that, The preset displacement is a displacement that causes the sample to produce a compressive strain of 20% to 30%.

6. The method for determining the deformation resistance of a foam core mold according to claim 5, characterized in that, The loading rate and unloading rate of the compression-unloading cycle test are the same, and the rate range is from 5 mm / min to 20 mm / min.

7. The method for determining the deformation resistance of a foam core mold according to claim 2, characterized in that, The step of determining whether the deformation resistance of the foam core mold under test is qualified based on the qualification judgment result of the foam core mold under test includes: If the apparent density of the foam core mold to be tested is within the acceptable range of the apparent density, and the rapid test index of the foam core mold to be tested is greater than or equal to the acceptable threshold of the rapid test index, then the deformation resistance of the foam core mold to be tested is determined to be acceptable. Otherwise, the deformation resistance of the foam core mold to be tested is determined to be unqualified.

8. A device for determining the deformation resistance of a foam core mold, characterized in that, The device for determining the deformation resistance of the foam core mold includes: The data acquisition module is used to acquire the apparent density of the foam core mold to be tested and at least one rapid test index; the rapid test index is a field-measurable parameter that has a statistical correlation with the standard compression set. The model processing module is used to input the apparent density and the rapid test index into the qualified judgment model corresponding to the type of the foam core mold to be tested, and to obtain the qualified judgment result of the foam core mold to be tested; the qualified judgment model includes a first mapping relationship and a second mapping relationship; the first mapping relationship is the mapping relationship between apparent density and compressive strength, and the second mapping relationship is the mapping relationship between rapid test index and standard compression set. The determination output module is used to determine whether the deformation resistance of the foam core mold under test is qualified based on the qualification determination result of the foam core mold under test.

9. An electronic device, characterized in that, include: The device includes a processor, a memory, and a bus. The memory stores machine-readable instructions executable by the processor. When the electronic device is running, the processor communicates with the memory via the bus. The machine-readable instructions are executed by the processor to perform the steps of the method for determining the deformation resistance of a foam core mold as described in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by a processor, performs the steps of the method for determining the deformation resistance of a foam core mold as described in any one of claims 1 to 7.

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