A method, system and electronic device for evaluating anti-penetration performance based on resonance method

Abstract

The present invention relates to a method, system and electronic equipment for evaluating anti-penetration performance based on a resonance method, and belongs to the field of computational materials science and technology. The method comprises: using a resonance method to detect a variety of cement-based materials to obtain dynamic elastic modulus; detecting the normalized penetration depth and pit diameter of cement-based materials; establishing a correlation equation between the dynamic elastic modulus and the normalized penetration depth / pit diameter; substituting the dynamic elastic modulus of the cement-based material to be evaluated into the correlation equation to calculate its normalized penetration depth and pit diameter. The characterization system established by the present invention can accurately evaluate the anti-penetration performance of cement-based materials with different material compositions and complex properties. Compared with traditional penetration experiments, the detection method used in the present invention can not only quickly and accurately evaluate the anti-penetration performance of cement-based materials with unknown components, but also greatly improve the accuracy and repeatability of the test because it basically does not cause damage to the test block.

Description

Technical Field

[0001] The present invention belongs to the technical field of computational materials science and relates to a method, system and electronic equipment for evaluating anti-penetration performance based on a resonance method. Background Art

[0002] The information disclosed in this background technology section is only intended to enhance understanding of the overall background of the invention and should not necessarily be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to those skilled in the art.

[0003] Dynamic elastic modulus refers to the elastic modulus of a material under dynamic load. It is one of the most important mechanical properties of cement-based materials. Methods for measuring the dynamic elastic modulus of cement-based materials include the resonance method and the acoustic pulse method.

[0004] Cement-based materials are the most common building materials used in protective engineering, widely used in the construction of various structures, including buildings, bridges, tunnels, ports, airports, and energy storage facilities. Cement-based materials with high compressive strength also exhibit strong penetration resistance. Furthermore, penetration resistance is primarily studied through light gas gun experiments. A crater is created on a test target, with the crater depth representing the penetration depth. Penetration resistance is then measured using the penetration depth (or normalized penetration depth) and crater diameter. Larger penetration depths and larger crater diameters indicate weaker penetration resistance. This is time-consuming and labor-intensive, so compressive strength is often used to predict a material's penetration resistance. However, with the continuous advancement of concrete materials, compressive strength has gradually increased, and its correlation with penetration resistance has gradually decreased, resulting in a decreasing accuracy in predicting penetration resistance based on compressive strength. Therefore, how to quickly and accurately evaluate the penetration resistance of cement-based materials has become an urgent challenge. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the present invention provides a method, system, and electronic device for evaluating penetration resistance based on a resonance method. The resonance method allows for rapid and convenient dynamic modulus measurement. Based on this dynamic elastic modulus measurement, the penetration resistance of cementitious materials can be rapidly and nondestructively evaluated.

[0006] In order to achieve the above object, the technical solution of the present invention is:

[0007] In a first aspect, a method for evaluating anti-penetration performance based on a resonance method comprises the following steps:

[0008] S1. Use the resonance method to test various cement-based materials and obtain the dynamic elastic modulus;

[0009] S2, testing the normalized penetration depth and pit diameter of the cement-based materials in S1, and the testing method is the same for different cement-based materials;

[0010] S3. Establishing a correlation equation between the dynamic elastic modulus and the normalized penetration depth, and establishing a correlation equation between the dynamic elastic modulus and the crater diameter;

[0011] S4. Perform resonance testing on the cement-based material to be evaluated, substitute the measured dynamic elastic modulus into the correlation equation in S3, and calculate the normalized penetration depth and pit diameter of the cement-based material to be evaluated to evaluate its anti-penetration performance.

[0012] In a second aspect, a resonance-based anti-penetration performance evaluation system for implementing the above-mentioned resonance-based anti-penetration performance evaluation method includes:

[0013] The first calculation module is used to calculate the dynamic elastic modulus of different cement-based materials;

[0014] The second calculation module is used to calculate the normalized penetration depth and pit diameter of cement-based materials;

[0015] A third calculation module is used to obtain a correlation equation between the dynamic elastic modulus and the normalized penetration depth and a correlation equation between the dynamic elastic modulus and the crater diameter;

[0016] A fourth calculation module is used to output the normalized penetration depth and crater diameter of the cement-based material to be evaluated obtained by the anti-penetration performance evaluation method based on the resonance method;

[0017] The fifth calculation module is used to evaluate the anti-penetration performance of the cement-based material to be evaluated based on the normalized penetration depth and the pit diameter output by the fourth calculation module.

[0018] In a third aspect, an electronic device comprises: a memory, a processor, and a program or instruction stored in the memory and executable on the processor, wherein the program or instruction, when executed by the processor, implements the steps of the above-mentioned anti-penetration performance evaluation method based on the resonance method.

[0019] The beneficial effects of the present invention are:

[0020] This invention proposes a resonance-based method for evaluating penetration resistance. The established characterization system can accurately assess the penetration resistance (including normalized penetration depth and pit diameter) of cementitious materials with diverse compositions and complex properties. Compared with traditional penetration tests, the detection method used in this invention can quickly and accurately assess the penetration resistance of cementitious materials. Because it causes minimal damage to the test pieces, it also significantly improves test accuracy and repeatability.

[0021] 2. In the resonance-based anti-penetration performance evaluation method proposed in the present invention, step S1 is used to obtain the dynamic elastic modulus. Both the static elastic modulus and the dynamic elastic modulus can be used to characterize the elastic modulus of cement-based materials. However, the static elastic modulus requires a long test time, its cumbersome test process, and strict requirements on specimen size make it difficult to popularize in industrial production, and its damage to the specimen itself is irreversible. In contrast, the dynamic elastic modulus test method, which has a short measurement time and does not damage the material, largely compensates for the above-mentioned shortcomings and can be widely used for testing in the material production process. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0023] Figure 1 Schematic diagram of the resonance detection device in Example 1 of the present invention.

[0024] Figure 2 Schematic diagram of the relationship between the dynamic elastic modulus and the normalized penetration depth in Example 1 of the present invention.

[0025] Figure 3 Schematic diagram of the relationship between the dynamic elastic modulus and the pit diameter in Example 1 of the present invention.

[0026] Figure 4 Schematic diagram of the relationship between compressive strength and normalized penetration depth in Comparative Example 1 of the present invention.

[0027] Among them, 1. Support block; 2. Test piece; 3. Accelerometer; 4. Oscilloscope; 5. Computer; 6. Beating hammer. DETAILED DESCRIPTION

[0028] It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present invention belongs.

[0029] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0030] A method for evaluating anti-penetration performance based on a resonance method comprises the following steps:

[0031] S1. Use the resonance method to test various cement-based materials and obtain the dynamic elastic modulus;

[0032] S2. Detect the normalized penetration depth and pit diameter of the cement-based material in S1. The detection method is the same for different cement-based materials.

[0033] S3. Establishing a correlation equation between the dynamic elastic modulus and the normalized penetration depth, and establishing a correlation equation between the dynamic elastic modulus and the crater diameter;

[0034] S4. Perform resonance testing on the cement-based material to be evaluated, substitute the measured dynamic elastic modulus into the correlation equation in S3, and calculate the normalized penetration depth and pit diameter of the cement-based material to be evaluated to evaluate its anti-penetration performance.

[0035] Optionally, cement-based materials include cement paste materials, cement mortar materials, concrete materials, high-ductility cement-based composite materials and ultra-high performance concrete. Since the technical solution of the present invention is to non-destructively detect cement-based materials with unknown component ratios, a variety of cement-based materials can use this method to evaluate their anti-penetration performance.

[0036] Optionally, in S1, in the resonance method test, the output frequency of the testing equipment is 100~20000 Hz, and the output power (indicating the striking force of the hammer) can cause the specimen to generate detectable forced vibration, so as to separate the resonant frequency of the specimen from the frequency of the detected forced vibration.

[0037] Optionally, in S1, multiple cement-based materials are made into cylindrical specimens of the same size for testing. Since the resonant frequency is related to the shape of the specimen, using specimens of the same shape and size can eliminate the differences caused by the shape, so that the numerical differences in the obtained dynamic elastic modulus are only related to the material.

[0038] Optionally, in S1, during the test, the accelerometer is pressed against the center of the circular end face of the specimen, and while striking the center of the opposite circular end face of the specimen, the resonant frequency of the specimen is collected and the dynamic elastic modulus is calculated (this process can be achieved through the solution in the technical document "GB / T50082-2019 Standard for Test Methods for Long-term Performance and Durability of Ordinary Concrete").

[0039] Optionally, in S1, at least two samples with different dynamic elastic moduli are taken for each material to improve the accuracy of the subsequently obtained correlation equation for the material.

[0040] Optionally, in S1, a coupling agent is applied to the contact position between the accelerometer and the specimen to ensure close contact between the two and reduce interference caused by the interface.

[0041] Optionally, in S1, the dynamic elastic modulus is calculated as follows:

[0042] ;

[0043] Among them, X DE is the dynamic elastic modulus;

[0044] L is the distance between the two circular end faces of the specimen;

[0045] d is the diameter of the specimen;

[0046] M is the mass of the specimen;

[0047] n' is the resonance frequency measured by the resonance method.

[0048] Optionally, in S2, the detection method includes: preparing a cement-based material as a target body, using a ballistic smoothbore gun to launch an ASSAB XW-42 high-strength alloy steel projectile, the projectile having a conical warhead with a diameter of 6 to 10 mm, and an impact velocity of 400 to 450 m / s; the launch direction is parallel to the ballistic thickness direction of the target body, which is a conventional detection method for anti-penetration performance.

[0049] Optional, in S3, normalized penetration depth Y 侵彻深度 and dynamic elastic modulus X DE The relationship is:

[0050] , .

[0051] Optional, in S3, the pit diameter Y 开坑直径 and dynamic elastic modulus X DE The relationship is:

[0052] , .

[0053] Based on this, the dynamic elastic modulus of the cement-based material to be evaluated is detected and substituted into the above-mentioned correlation equation to obtain the normalized penetration depth and pit diameter of the cement-based material to be evaluated, thereby evaluating its anti-penetration performance.

[0054] A resonance-based anti-penetration performance evaluation system for implementing the above-mentioned resonance-based anti-penetration performance evaluation method comprises:

[0055] The first calculation module is used to calculate the dynamic elastic modulus of different cement-based materials;

[0056] The second calculation module is used to calculate the normalized penetration depth and pit diameter of cement-based materials;

[0057] A third calculation module is used to obtain a correlation equation between the dynamic elastic modulus and the normalized penetration depth and a correlation equation between the dynamic elastic modulus and the crater diameter;

[0058] a fourth calculation module, configured to output the normalized penetration depth and crater diameter of the cement-based material to be evaluated obtained based on the above-mentioned anti-penetration performance evaluation method of the resonance method;

[0059] The fifth calculation module is used to evaluate the anti-penetration performance of the cement-based material to be evaluated based on the normalized penetration depth and the pit diameter output by the fourth calculation module.

[0060] An electronic device comprises: a memory, a processor, and a program or instruction stored in the memory and executable on the processor, wherein the program or instruction, when executed by the processor, implements the steps of the above-mentioned method for evaluating anti-penetration performance based on the resonance method.

[0061] Example 1

[0062] Cement-based materials, including cement paste materials, cement mortar materials, concrete materials, high-ductility cement-based composite materials and ultra-high performance concrete, were prepared using different component ratios.

[0063] The three cement paste materials are numbered CP-1~CP-3, and their preparation raw materials do not contain fine aggregate, coarse aggregate and fiber.

[0064] The six cement mortar materials are numbered CM-1 to CM-6, and their preparation raw materials do not contain coarse aggregate and fiber phase.

[0065] The seven concrete materials are numbered CC-1 to CC-7, and their preparation raw materials include cement mortar, coarse aggregate, with or without fiber.

[0066] The two high-ductility cement-based composite materials are numbered ECC-1 and ECC-2. Their raw materials include water, silica fume, fly ash, fiber, water reducer and river sand. Among them, river sand is fine aggregate and is a component of cement mortar; coarse aggregate is not included.

[0067] The four types of ultra-high performance concrete are numbered UHPC-1 to UHPC-4, and their preparation raw materials include cement mortar, coarse aggregate and fiber.

[0068] In this embodiment, the anti-penetration performance evaluation method based on the resonance method includes the following steps:

[0069] S1. Resonance method for testing dynamic elastic modulus.

[0070] The cement-based material was cast into a φ100*400mm cylindrical specimen. After curing, the circular end faces of the specimen were polished flat and the dust on the surface of the specimen was wiped off with an alcohol solution. The length L, diameter d and weight M of the specimen were measured with an accuracy of 0.01kg and a length of mm.

[0071] like Figure 1 As shown in the figure, the support block 1 is placed at the center of the length direction of the specimen 2, and the contact position is parallel to the cross section of the length direction of the specimen 2, so that both ends of the specimen 2 are suspended. The support block 1 uses a polystyrene foam pad with a thickness of 20mm. Its density is much smaller than that of the specimen 2, which is 17±1kg / m 3 ; Install the accelerometer 3 at the center of one of the end faces of the specimen 2. Before installing the accelerometer 3, apply vaseline on the end face as a coupling agent to ensure close contact between the accelerometer 3 and the specimen 2.

[0072] like Figure 1 As shown, the accelerometer 3 is connected to the oscilloscope 4, the computer 5 and other equipment in sequence to complete the preparation for the experiment. At the beginning of the experiment, the center of the end face of the specimen 2 where the accelerometer 3 is not installed is struck with a hammer 6, the detection frequency of the receiving device (including the oscilloscope 4 and the computer 5) is adjusted, and the waveform is displayed through the oscilloscope 4. When the oscilloscope 4 displays a curve without noise, the corresponding frequency with the highest amplitude is the basic longitudinal frequency, that is, the resonant frequency n' (this process can be achieved through the scheme in the technical document "GB / T50082-2019 Standard for Test Methods for Long-term Performance and Durability of Ordinary Concrete"); and the dynamic elastic modulus of the specimen 2 is calculated; each specimen 2 is tested twice to reduce accidental errors in the experiment.

[0073] According to the measured length L, diameter d, weight M of the specimen and the resonant frequency n' of the specimen, the calculation method for the dynamic elastic modulus is:

[0074] .

[0075] S2. Anti-penetration test.

[0076] The different cement-based materials in S1 were prepared as targets with a target size of 300×170×150 mm. 3 (150mm is the thickness along the ballistic direction).

[0077] The ASSAB XW-42 high-strength alloy steel projectile, with an 8mm diameter conical warhead, was fired from a ballistic smoothbore gun at a target impact velocity of 420m / s. The firing direction was parallel to the target along the thickness of the trajectory, with the penetration crater located at the center of the target plane. A laser velocity measurement system was used to measure the projectile velocity before and after firing, and a high-speed camera was used to monitor whether the trajectory direction was perpendicular to the target to eliminate atypical test results caused by firing angle deviation.

[0078] After the anti-penetration test, the degree of damage to the cement-based material target under the action of high-speed projectiles was measured, including the normalized penetration depth (i.e., the distance from the projectile penetrating the target to the deepest point) and the crater diameter (the diameter of the equivalent circle with the same area as the crater). The normalized penetration depth was calculated from the normalized penetration depth (normalized penetration depth = normalized penetration depth / target impact velocity), and the results are summarized in Table 1.

[0079] Table 1 Test results of cement-based materials

[0080]

[0081] S3. Establish a correlation equation between the dynamic elastic modulus and anti-penetration performance.

[0082] According to the dynamic elastic modulus and normalized penetration depth data of CC-8 in Table 1, the following are obtained: Figure 2 As shown in the relationship diagram, it can be seen that there is an obvious correlation between the dynamic elastic modulus and the normalized penetration depth. The anti-penetration performance can be evaluated based on the dynamic elastic modulus. The normalized penetration depth Y 侵彻深度 and dynamic elastic modulus X DE The relationship is:

[0083] , .

[0084] According to the dynamic elastic modulus and pit diameter data of CC-8 in Table 1, the following are obtained: Figure 3 As shown in the relationship diagram, it can be seen that there is an obvious correlation between the dynamic elastic modulus and the pit diameter. The anti-penetration performance can be calculated and evaluated based on the dynamic elastic modulus. The pit diameter Y 开坑直径 and dynamic elastic modulus X DE The relationship is:

[0085] , .

[0086] S4. Evaluation of the anti-penetration performance of cement-based materials with unknown properties.

[0087] A cement-based material with unknown specific component ratio and anti-penetration performance was selected, numbered CC-8, and a dynamic elastic modulus of 114.5 GPa was obtained according to the method of Example 1. This dynamic elastic modulus was substituted into the calculation method of the normalized penetration depth and the pit diameter in Example 1 to obtain the normalized penetration depth Y obtained by evaluation. 侵彻深度 20.35mm; pit diameter Y 开坑直径 It is 48.98mm.

[0088] The anti-penetration performance of the cement-based material in this embodiment was actually measured according to the method of Example 1. The actual normalized penetration depth was measured to be 20.2 mm, and the error of the evaluation data relative to the measured data was: |100%-20.35 / 20.2|=0.7%; the actual pit diameter was measured to be 49.2 mm, and the error of the evaluation data relative to the measured data was: |100%-48.98 / 49.2|=0.45%; indicating that the obtained normalized penetration depth Y 侵彻深度 and the pit diameter Y 开坑直径 The results are in good agreement with the actual measured data, that is, the anti-penetration performance evaluation method obtained in Example 1 can be applied to cement-based composite materials with unknown performance.

[0089] Example 2

[0090] A resonance-based anti-penetration performance evaluation system for implementing the resonance-based anti-penetration performance evaluation method in Example 1, comprising:

[0091] The first calculation module is used to calculate the dynamic elastic modulus of different cement-based materials;

[0092] The second calculation module is used to calculate the normalized penetration depth and pit diameter of cement-based materials;

[0093] The third calculation module is used to obtain the correlation equation between the dynamic elastic modulus and the normalized penetration depth and the correlation equation between the dynamic elastic modulus and the crater diameter.

[0094] A fourth calculation module is used to output the normalized penetration depth and pit diameter of the cement-based material to be evaluated obtained based on the anti-penetration performance evaluation method of the resonance method obtained in Example 1;

[0095] The fifth calculation module is used to evaluate the anti-penetration performance of the cement-based material to be evaluated based on the normalized penetration depth and the pit diameter output by the fourth calculation module.

[0096] Example 3

[0097] An electronic device comprises: a memory, a processor, and a program or instruction stored in the memory and executable on the processor, wherein the program or instruction, when executed by the processor, implements the steps of the above-mentioned method for evaluating anti-penetration performance based on the resonance method.

[0098] Comparative Example 1

[0099] The compressive strength of each cement-based material in Example 1 was tested separately, and the results are summarized in Table 1.

[0100] According to the compressive strength, normalized penetration depth and pit diameter data in Table 1, the following Figure 4 The relationship between compressive strength and normalized penetration depth is shown in the graph. It can be seen that the dispersion of the points in the graph is high, indicating that the correlation between compressive strength and the anti-penetration performance of cement-based materials is poor and difficult to accurately evaluate.

[0101] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A method for evaluating anti-penetration performance based on a resonance method, characterized in that: The following steps are involved: S1. Use the resonance method to test various cement-based materials and obtain the dynamic elastic modulus; In S1, during the test, the accelerometer is pressed against the center of the circular end face of the specimen, and while striking the center of the opposite circular end face of the specimen, the resonance frequency of the specimen is collected and the dynamic elastic modulus is calculated; S2, testing the normalized penetration depth and pit diameter of the cement-based materials in S1, and the testing method is the same for different cement-based materials; S3. Establishing a correlation equation between the dynamic elastic modulus and the normalized penetration depth, and establishing a correlation equation between the dynamic elastic modulus and the crater diameter; In S3, the normalized penetration depth Y 侵彻深度 and dynamic elastic modulus X DE The relationship is: ， ； Pit diameter Y 开坑直径 The relationship with the dynamic elastic modulus XDE is: ， ； S4. Perform resonance testing on the cement-based material to be evaluated, substitute the measured dynamic elastic modulus into the correlation equation in S3, and calculate the normalized penetration depth and pit diameter of the cement-based material to be evaluated to evaluate its anti-penetration performance.

2. The method for evaluating anti-penetration performance based on the resonance method according to claim 1, wherein: In S1, cement-based materials include cement paste materials, cement mortar materials, ordinary concrete materials, high-ductility cement-based composite materials and ultra-high performance concrete materials.

3. The method for evaluating anti-penetration performance based on the resonance method according to claim 1, wherein: In S1, during the resonance method test, the output frequency of the testing equipment is 100~20000Hz, and the output power can cause the test piece to produce detectable forced vibration.

4. The method for evaluating anti-penetration performance based on the resonance method according to claim 1, wherein: In S1, various cement-based materials were made into cylindrical specimens of the same size for testing.

5. The method for evaluating anti-penetration performance based on the resonance method according to claim 1, wherein: In S1, at least two samples with different dynamic elastic moduli are taken for each material.

6. The method for evaluating anti-penetration performance based on the resonance method according to claim 1, wherein: In S2, the detection method includes: preparing a cement-based material as a target body, using a ballistic smoothbore gun to launch an ASSAB XW-42 high-strength alloy steel projectile with a conical warhead of 6 to 10 mm in diameter and an impact velocity of 400 to 450 m / s; the launch direction is parallel to the target body along the ballistic thickness direction.

7. A system for evaluating anti-penetration performance based on a resonance method for implementing the method for evaluating anti-penetration performance based on a resonance method according to any one of claims 1 to 6, characterized in that: include: The first calculation module is used to calculate the dynamic elastic modulus of different cement-based materials; The second calculation module is used to calculate the normalized penetration depth and pit diameter of cement-based materials; A third calculation module is used to obtain a correlation equation between the dynamic elastic modulus and the normalized penetration depth and a correlation equation between the dynamic elastic modulus and the crater diameter; A fourth calculation module is used to output the normalized penetration depth and pit diameter of the cement-based material to be evaluated obtained by the anti-penetration performance evaluation method based on the resonance method; The fifth calculation module is used to evaluate the anti-penetration performance of the cement-based material to be evaluated based on the normalized penetration depth and the pit diameter output by the fourth calculation module.

8. An electronic device, characterized in that: include: A memory, a processor, and a program or instruction stored in the memory and executable on the processor, wherein the program or instruction, when executed by the processor, implements the steps of the anti-penetration performance evaluation method based on the resonance method as described in any one of claims 1 to 6.

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