Anti-penetration performance evaluation method and system based on resonance method and electronic equipment

Abstract

The invention relates to an anti-penetration performance evaluation method and system based on a resonance method and electronic equipment, and belongs to the technical field of computational material science. The method comprises the following steps: detecting various cement-based materials by using a resonance method to obtain a dynamic elastic modulus; the normalized penetration depth and the pit opening diameter of the cement-based material are detected; establishing an incidence relation equation of the dynamic elastic modulus and the normalized penetration depth / digging diameter; and substituting the dynamic elastic modulus of the to-be-evaluated cement-based material into the incidence relation equation, and calculating the normalized penetration depth and the pit digging diameter of the to-be-evaluated cement-based material. The characterization system established by the invention can accurately evaluate the anti-penetration performance of cement-based materials with different material compositions and complex performance. Compared with a traditional penetration experiment, the detection method used by the invention not only can quickly and accurately evaluate the anti-penetration performance of the cement-based material with unknown components, but also can greatly improve the accuracy and repeatability of the test due to the fact that the test block is basically not damaged.

Description

Technical Field

[0001] The invention belongs to the technical field of computational material 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 the 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 a person skilled in the art.

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

[0004] Cement-based materials are the most common building materials in protective engineering and are widely used in the construction of various engineering structures such as buildings, bridges, tunnels, ports, airports and energy storage facilities. Since cement-based materials with high compressive strength also have strong anti-penetration performance, and the anti-penetration performance of materials is mainly studied through light gas gun experiments, a crater is punched on the test target, and the depth of the crater is the penetration depth. Then the penetration depth (or normalized penetration depth) and the crater diameter are used to characterize the anti-penetration performance. The larger the penetration depth and the larger the crater diameter, the weaker the anti-penetration performance of the material. It is time-consuming and labor-intensive, so the compressive strength is often used to predict the anti-penetration performance of the material. However, with the continuous updating of concrete materials, the compressive strength gradually increases, and its correlation with anti-penetration performance gradually decreases, resulting in the accuracy of predicting anti-penetration performance by compressive strength becoming lower and lower. Therefore, how to quickly and accurately evaluate the anti-penetration performance of cement-based materials has become an urgent problem to be solved. Summary of the invention

[0005] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a method, system and electronic device for evaluating anti-penetration performance based on the resonance method. The resonance method can quickly and conveniently obtain the measurement results of the dynamic modulus, and based on the measurement results of the dynamic elastic modulus, the anti-penetration performance of cement-based materials can be non-destructively and quickly evaluated.

[0006] In order to achieve the above object, the technical solution of the present invention is: In a first aspect, a method for evaluating anti-penetration performance based on a resonance method comprises the following steps: S1. Use the resonance method to test various cement-based materials and obtain the dynamic elastic modulus; S2, detecting the normalized penetration depth and the pit diameter of the cement-based materials in S1, and the detection method of different cement-based materials is the same; 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 pit diameter; S4. Perform resonance testing on the cement-based material to be evaluated, substitute the measured dynamic elastic modulus into the correlation equation in S3, calculate the normalized penetration depth and pit diameter of the cement-based material to be evaluated, so as to evaluate its anti-penetration performance.

[0007] In a second aspect, a resonance-based anti-penetration performance evaluation system for implementing the above-mentioned resonance-based anti-penetration performance evaluation method comprises: A 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 the pit diameter of the cement-based material; 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 pit diameter; A fourth calculation module is used to output the normalized penetration depth and the 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 according to the normalized penetration depth and the pit diameter output by the fourth calculation module.

[0008] In a third aspect, an electronic device includes: 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 in the above-mentioned anti-penetration performance evaluation method based on the resonance method.

[0009] The beneficial effects of the present invention are: 1. The present invention proposes a method for evaluating the anti-penetration performance based on the resonance method. The established characterization system can accurately evaluate the anti-penetration performance (including normalized penetration depth and pit diameter) of cement-based materials with different material compositions and complex performance. Compared with traditional penetration experiments, the detection method used in the present invention can quickly and accurately evaluate the anti-penetration performance of cement-based materials. Since the test block is basically not damaged, the accuracy and repeatability of the test can also be greatly improved.

[0010] 2. In the anti-penetration performance evaluation method based on the resonance 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, but the static elastic modulus requires a long test time, and its cumbersome test process and strict requirements on the 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 makes up for the above defects of being difficult to popularize, and can be widely used in detection in the material production process. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The accompanying drawings in the specification, 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.

[0012] Figure 1 Schematic diagram of the resonance detection device in Example 1 of the present invention.

[0013] Figure 2 Schematic diagram of the relationship between the dynamic elastic modulus and the normalized penetration depth in Example 1 of the present invention.

[0014] Figure 3 Schematic diagram of the relationship between the dynamic elastic modulus and the pit diameter in Example 1 of the present invention.

[0015] Figure 4 Schematic diagram of the relationship between compressive strength and normalized penetration depth in Comparative Example 1 of the present invention.

[0016] Among them, 1. support block; 2. test piece; 3. accelerometer; 4. oscilloscope; 5. computer; 6. striking hammer. DETAILED DESCRIPTION

[0017] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0018] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0019] A method for evaluating anti-penetration performance based on a resonance method comprises the following steps: S1. Use the resonance method to test various cement-based materials and obtain the dynamic elastic modulus; S2, detecting the normalized penetration depth and pit diameter of the cement-based materials in S1, and the detection method of different cement-based materials is the same; 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 pit diameter; S4. Perform resonance testing on the cement-based material to be evaluated, substitute the measured dynamic elastic modulus into the correlation equation in S3, calculate the normalized penetration depth and pit diameter of the cement-based material to be evaluated, so as to evaluate its anti-penetration performance.

[0020] 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.

[0021] Optionally, in S1, in the resonance method test, the output frequency of the test equipment is 100~20000 Hz, and the output power (indicating the striking force of the hammer) can cause the specimen to produce detectable forced vibration, so as to separate the resonant frequency of the specimen from the frequency of the detected forced vibration.

[0022] Optionally, in S1, a variety of cement-based materials are made into cylindrical specimens of the same size for testing. Since the resonance frequency is related to the shape of the specimen, using specimens of the same shape and size can eliminate the difference caused by the shape, so that the numerical difference of the dynamic elastic modulus obtained is only related to the material.

[0023] 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 scheme in the technical document "GB / T50082-2019 Standard for Test Methods for Long-term Performance and Durability of Ordinary Concrete").

[0024] Optionally, in S1, at least two samples with different dynamic elastic moduli are taken for each material to improve the accuracy of the correlation equation obtained subsequently for the material.

[0025] 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.

[0026] Optionally, in S1, the calculation method of the dynamic elastic modulus is: ; Among them, X DE is the dynamic elastic modulus; L is the distance between the two circular end faces of the specimen; d is the diameter of the specimen; M is the mass of the specimen; n' is the resonance frequency measured by the resonance method.

[0027] 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 is a conical warhead with a diameter of 6~10mm, and the target impact speed is 400~450m / 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.

[0028] Optional, in S3, the normalized penetration depth Y 侵彻深度 and dynamic elastic modulus X DE The relationship is: , .

[0029] Optional, in S3, the pit diameter Y 开坑直径 and dynamic elastic modulus X DE The relationship is: , .

[0030] 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.

[0031] A resonance-based anti-penetration performance evaluation system for implementing the above-mentioned resonance-based anti-penetration performance evaluation method comprises: A 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 the pit diameter of the cement-based material; 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 pit diameter; A fourth calculation module is used to output the normalized penetration depth and the pit diameter of the cement-based material to be evaluated obtained by the anti-penetration performance evaluation method based on the above-mentioned resonance method; The fifth calculation module is used to evaluate the anti-penetration performance of the cement-based material to be evaluated according to the normalized penetration depth and the pit diameter output by the fourth calculation module.

[0032] 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 in the above-mentioned anti-penetration performance evaluation method based on the resonance method.

[0033] Example 1 Cement-based materials, including cement paste materials, cement mortar materials, concrete materials, high-ductility cement-based composite materials and ultra-high performance concrete, are prepared by adopting different component ratios.

[0034] The three cement paste materials are numbered CP-1~3, and their preparation raw materials do not contain fine aggregate, coarse aggregate and fiber.

[0035] The six cement mortar materials are numbered CM-1~6, and their preparation raw materials do not contain coarse aggregate and fiber phase.

[0036] The seven types of concrete materials are numbered CC-1 to CC-7, and their preparation raw materials include cement mortar, coarse aggregate, with or without fiber.

[0037] The two high-ductility cement-based composite materials are numbered ECC-1 and ECC-2 respectively. Their preparation 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; and coarse aggregate is not included.

[0038] The four types of ultra-high performance concrete are numbered UHPC-1~4, and their preparation raw materials include cement mortar, coarse aggregate and fiber.

[0039] In this embodiment, the anti-penetration performance evaluation method based on the resonance method includes the following steps: S1. Resonance method for testing dynamic elastic modulus.

[0040] The cement-based material was cast into a φ100*400mm cylindrical test block. After curing, the circular end faces at both ends of the test piece were polished and smoothed, and the dust on the surface of the test piece was wiped off with an alcohol solution. The length L, diameter d and weight M of the test piece were measured, and the measured weight was accurate to 0.01kg and the length was accurate to millimeters.

[0041] 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 20 mm, and its density is much smaller than that of the specimen 2, which is 17±1kg / m 3An accelerometer 3 is installed at the center of one of the end faces of the specimen 2. Before installing the accelerometer 3, vaseline is applied to the end face as a coupling agent to ensure close contact between the accelerometer 3 and the specimen 2.

[0042] 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 of the experiment. At the beginning of the experiment, a hammer 6 is used to knock the center of the end face of the specimen 2 where the accelerometer 3 is not installed, 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 resonance 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.

[0043] According to the measured length L, diameter d, weight M of the specimen and the resonant frequency n' of the specimen, the calculation method of the dynamic elastic modulus is: .

[0044] S2. Anti-penetration test.

[0045] 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).

[0046] A ballistic smoothbore gun was used to fire the ASSAB XW-42 high-strength alloy steel projectile, which had a conical warhead with a diameter of 8 mm and an impact velocity of 420 m / s. The firing direction was parallel to the target along the thickness direction of the trajectory, and the penetration pit was located at the center of the target plane. During the process, a laser speed 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, in order to eliminate atypical test results caused by firing angle deviation.

[0047] 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 through the normalized penetration depth (normalized penetration depth = normalized penetration depth / target impact speed), and the results are summarized in Table 1.

[0048] Table 1 Test results of cement-based materials

[0049] S3. Establish the correlation equation between dynamic elastic modulus and anti-penetration performance.

[0050] 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: , .

[0051] According to the dynamic elastic modulus and pit diameter data other than 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. 开坑直径 and dynamic elastic modulus X DE The relationship is: , .

[0052] S4. Evaluation of the anti-penetration performance of cement-based materials with unknown properties.

[0053] A cement-based material with unknown specific component ratio and anti-penetration performance is selected, numbered CC-8, and a dynamic elastic modulus of 114.5 GPa is obtained according to the method of Example 1. This dynamic elastic modulus is 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; the pit diameter Y 开坑直径 It is 48.98mm.

[0054] According to the method of Example 1, the anti-penetration performance of the cement-based material in this embodiment is actually measured, and the actual normalized penetration depth is measured to be 20.2 mm, and the error of the evaluation data relative to the measured data is: |100%-20.35 / 20.2|=0.7%; the actual pit diameter is measured to be 49.2 mm, and the error of the evaluation data relative to the measured data is: |100%-48.98 / 49.2|=0.45%; It shows that the normalized penetration depth Y 侵彻深度 and the pit diameter Y 开坑直径 The data is 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.

[0055] Example 2 A resonance-based anti-penetration performance evaluation system for implementing the resonance-based anti-penetration performance evaluation method in Embodiment 1, comprising: A 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 the pit diameter of the cement-based material; 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 pit diameter.

[0056] A fourth calculation module is used to output the normalized penetration depth and the 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; The fifth calculation module is used to evaluate the anti-penetration performance of the cement-based material to be evaluated according to the normalized penetration depth and the pit diameter output by the fourth calculation module.

[0057] Example 3 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 in the above-mentioned anti-penetration performance evaluation method based on the resonance method.

[0058] Comparative Example 1 The compressive strength of each cement-based material in Example 1 was tested separately, and the results are summarized in Table 1.

[0059] According to the compressive strength, normalized penetration depth and pit diameter data in Table 1, the following Figure 4 The relationship diagram between compressive strength and normalized penetration depth shown in the figure shows that the discrete degree of each point in the figure 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.

[0060] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for evaluating anti-penetration performance based on 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; S2, detecting the normalized penetration depth and the pit diameter of the cement-based materials in S1, and the detection method of different cement-based materials is the same; 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 pit diameter; S4. Perform resonance testing on the cement-based material to be evaluated, substitute the measured dynamic elastic modulus into the correlation equation in S3, calculate the normalized penetration depth and pit diameter of the cement-based material to be evaluated, so as to evaluate its anti-penetration performance.

2. The method for evaluating anti-penetration performance based on the resonance method according to claim 1, characterized in that: 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, characterized in that: In S1, in the resonance method test, the output frequency of the test equipment is 100~20000Hz, and the output power can make the test piece produce detectable forced vibration.

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

5. The method for evaluating anti-penetration performance based on the resonance method as claimed in claim 4, characterized in that: 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.

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

7. The method for evaluating anti-penetration performance based on the resonance method according to claim 1, characterized in that: 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 is a conical warhead with a diameter of 6~10mm, and the target impact speed is 400~450m / s; the launch direction is parallel to the ballistic thickness direction of the target body.

8. The method for evaluating anti-penetration performance based on the resonance method according to claim 1, characterized in that: 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: ， 。 9. 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 as claimed in any one of claims 1 to 8, characterized in that: include: A 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 the pit diameter of the cement-based material; 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 pit diameter; A fourth calculation module, for outputting the normalized penetration depth and the 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 according to the normalized penetration depth and the pit diameter output by the fourth calculation module.

10. 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 in the anti-penetration performance evaluation method based on the resonance method as described in any one of claims 1 to 8.

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