1. A method for acquiring a strain-life characteristic curve of a rubber material is characterized by comprising the following steps:

obtaining the static strength parameter and the critical tearing energy T of 3 rubber pure shear samples after the quasi-static tensile property test_c；

Acquiring fatigue crack propagation test data of the other 3 rubber pure shear samples under the loading of constant strain rate amplitude variation values; the fatigue crack propagation test data comprise the crack length a and the corresponding cycle number N of the pure rubber shear test sample, and stress and strain data in an effective area of the pure rubber shear test sample;

establishing a crack propagation life model according to the fatigue crack propagation test data of the 3 rubber pure shear samples;

according to the crack propagation model of the rubber material and the equivalent initial crack size a in the rubber blank material₀And acquiring a strain-life characteristic curve of the rubber material under the condition of a preset strain epsilon.

2. The method for acquiring the strain-life characteristic curve of the rubber material according to claim 1, wherein a crack propagation life model is established according to fatigue crack propagation test data of 3 pure shear samples of the rubber, specifically:

performing data fitting on local test data of the fatigue crack propagation test data scatter diagram of the 3 rubber pure shear samples based on a function polynomial method, and obtaining corresponding crack propagation rate by derivationFurther, different cycle numbers N are obtained_iCorresponding crack propagation rate

Based on different cycle numbers N_iDetermining the strain energy density W by an integral mode according to a stress and strain data curve in the effective area of the rubber pure shear sample, and further determining the tearing energy T (Wh) of the rubber pure shear sample₀；

Based on the crack propagation rate obtainedAnd tear energy T, based on the number of cycles N, paired to form a crack propagation rateDetermining source data related to the tearing energy T;

AT based on the power law of crack propagation model^FDetermining parameters A and F of a crack propagation model based on the source data and a least squares fit;

based on the crack propagation model with the determined model parameters A and F, the calculation formula of the crack propagation life obtained through integration is as follows:wherein, a₀To equivalent initial crack size, a_fThe maximum allowable crack size for the material at which fatigue fracture occurs.

3. The method for obtaining the strain-life characteristic curve of a rubber material as claimed in claim 2, wherein the initial crack size a is equivalent in the rubber material according to the crack propagation model and the rubber blank material₀Before obtaining the strain-life characteristic curve of the rubber material under the condition of the preset strain epsilon, the method further comprises the following steps:

adopting a dumbbell-shaped test sample in the standard ASTM D412 to carry out a tensile fatigue failure test, measuring 3 data points, and combining the crack propagation life calculation formula to calibrate the equivalent initial crack size a in the rubber blank material₀*。

4. The method for obtaining the strain-life characteristic curve of a rubber material as claimed in claim 1, wherein the method is based on the crack propagation model of the rubber material and the equivalent initial crack size a in the rubber blank material₀Acquiring a strain-life characteristic curve of the rubber material under a preset strain epsilon condition, specifically:

according to the crack propagation model of the rubber material and the equivalent initial crack size a in the rubber blank material₀Under the condition of preset strain epsilon, according to the formulaAnd calculating the corresponding fatigue life N to obtain a strain-life characteristic curve of the rubber material.

5. The method for acquiring the strain-life characteristic curve of the rubber material according to claim 1, further comprising:

preparing 6 rubber pure shear samples; wherein each of the rubber pure shear samples is a rubber material with a geometric shape which is manufactured according to an aspect ratio of at least 5.

6. An apparatus for obtaining a strain-life characteristic curve of a rubber material, comprising:

a first acquiring unit for acquiring 3 rubber materialsStatic strength parameter and critical tearing energy T of shear sample after quasi-static tensile property test_c；

The second acquisition unit is used for acquiring fatigue crack propagation test data of the other 3 rubber pure shear samples under the loading of the constant strain rate amplitude variation value; the fatigue crack propagation test data comprise the crack length a and the corresponding cycle number N of the pure rubber shear test sample, and stress and strain data in an effective area of the pure rubber shear test sample;

the model acquisition unit is used for establishing a crack propagation life model according to the fatigue crack propagation test data of the 3 rubber pure shear samples;

a strain-life characteristic curve obtaining unit for obtaining the equivalent initial crack size a according to the crack propagation model of the rubber material and the rubber blank material₀And acquiring a strain-life characteristic curve of the rubber material under the condition of a preset strain epsilon.

7. The device for acquiring the strain-life characteristic curve of the rubber material according to claim 6, wherein the model acquiring unit is specifically configured to:

performing data fitting on local test data of the fatigue crack propagation test data scatter diagram of the 3 rubber pure shear samples based on a function polynomial method, and obtaining corresponding crack propagation rate by derivationFurther, different cycle numbers N are obtained_iCorresponding crack propagation rate

Based on different cycle numbers N_iDetermining the strain energy density W by an integral mode according to a stress and strain data curve in the effective area of the rubber pure shear sample, and further determining the tearing energy T (Wh) of the rubber pure shear sample₀；

Based on the crack propagation rate obtainedAnd tear energy T, based on the number of cycles N, paired to form a crack propagation rateDetermining source data related to the tearing energy T;

AT based on the power law of crack propagation model^FDetermining parameters A and F of a crack propagation model based on the source data and a least squares fit;

based on the crack propagation model with the determined model parameters A and F, the calculation formula of the crack propagation life obtained through integration is as follows:wherein, a₀To equivalent initial crack size, a_fThe maximum allowable crack size for the material at which fatigue fracture occurs.

8. The apparatus for acquiring a strain-life characteristic curve of a rubber material according to claim 6, wherein the strain-life characteristic curve acquiring unit is specifically configured to:

according to the crack propagation model of the rubber material and the equivalent initial crack size a in the rubber blank material₀Under the condition of preset strain epsilon, according to the formulaAnd calculating the corresponding fatigue life N to obtain a strain-life characteristic curve of the rubber material.

9. A computer terminal device, comprising:

one or more processors;

a memory coupled to the processor for storing one or more programs;

when the one or more programs are executed by the one or more processors, the one or more processors implement the method for acquiring a strain-life characteristic curve of a rubber material according to any one of claims 1 to 5.

10. A computer-readable storage medium on which a computer program is stored, the computer program, when being executed by a processor, implementing the method for acquiring a strain-life characteristic curve of a rubber material according to any one of claims 1 to 5.

Background

In a conventional rubber material epsilon-N fatigue test, the prior technical scheme is to directly test the combination of the fatigue life and the strain amplitude of the rubber material with the aid of a dumbbell-shaped rubber sample, wherein the fatigue life of the rubber material is 1-1000 ten thousand times. However, the prior experimental technical solutions have significant disadvantages: in the early stage, a large number of material samples are required to be manufactured, and each sample is subjected to a fatigue failure test, so that the time consumption is long; in addition, the inherent dispersibility of fatigue test data and the required number of basic data points are considered, the combination of the fatigue times of the fatigue life of 1-1000 thousands of times and the corresponding strain amplitude is directly tested, the accumulated total times of the fatigue tests reach hundreds of millions of times, the test workload is huge, a large number of rubber test samples need to be prepared, test equipment is occupied for a long time, the development of other projects is influenced, and the development and design efficiency of rubber vibration reduction products and systems is seriously influenced.

Disclosure of Invention

The purpose of the invention is: the method and the device for acquiring the strain-life characteristic curve of the rubber material, the computer terminal equipment and the computer readable storage medium are provided, the acquisition of the original data of the fatigue characteristic test can be completed only by 6 pure rubber shear samples and 3 standard dumbbell type samples, the acquisition of the strain-life (epsilon-N) characteristic curve can be completed by processing the original experimental data by combining a fracture mechanics related theoretical formula and a rubber fatigue damage mechanism, and the problems of long test period and large number of samples of a conventional strain-life (epsilon-N) curve can be solved.

In order to achieve the above object, the present invention provides a method for obtaining a strain-life characteristic curve of a rubber material, comprising:

obtaining the static strength parameter and the critical tearing energy T of 3 rubber pure shear samples after the quasi-static tensile property test_c；

Acquiring fatigue crack propagation test data of the other 3 rubber pure shear samples under the loading of constant strain rate amplitude variation values; the fatigue crack propagation test data comprise the crack length a and the corresponding cycle number N of the pure rubber shear test sample, and stress and strain data in an effective area of the pure rubber shear test sample;

establishing a crack propagation life model according to the fatigue crack propagation test data of the 3 rubber pure shear samples;

according to the crack propagation model of the rubber material and the equivalent initial crack size a in the rubber blank material₀And acquiring a strain-life characteristic curve of the rubber material under the condition of a preset strain epsilon.

In one embodiment, the establishing a crack propagation life model according to the fatigue crack propagation test data of the 3 rubber pure shear samples specifically comprises:

performing data fitting on local test data of the fatigue crack propagation test data scatter diagram of the 3 rubber pure shear samples based on a function polynomial method, and obtaining corresponding crack propagation rate by derivationFurther, different cycle numbers N are obtained_iCorresponding crack propagation rate

Based on different cycle numbers N_iDetermining the strain energy density W by an integral mode according to a stress and strain data curve in the effective area of the rubber pure shear sample, and further determining the tearing energy T (Wh) of the rubber pure shear sample₀；

Based on the crack propagation rate obtainedAnd tear energy T, based on the number of cycles N, paired to form a crack propagation rateDetermination of the tear energy TThe source data of (1);

AT based on the power law of crack propagation model^FDetermining parameters A and F of a crack propagation model based on the source data and a least squares fit;

based on the crack propagation model with the determined model parameters A and F, the calculation formula of the crack propagation life obtained through integration is as follows:wherein, a₀To equivalent initial crack size, a_fThe maximum allowable crack size for the material at which fatigue fracture occurs.

In one embodiment, the rubber material crack propagation model and the rubber blank material are used as the basis of the equivalent initial crack size a₀Before obtaining the strain-life characteristic curve of the rubber material under the condition of the preset strain epsilon, the method further comprises the following steps:

adopting a dumbbell-shaped test sample in the standard ASTM D412 to carry out a tensile fatigue failure test, measuring 3 data points, and combining the crack propagation life calculation formula to calibrate the equivalent initial crack size a in the rubber blank material₀*。

In one embodiment, the crack propagation model is determined according to the rubber material and the equivalent initial crack size a in the rubber blank material₀Acquiring a strain-life characteristic curve of the rubber material under a preset strain epsilon condition, specifically:

according to the crack propagation model of the rubber material and the equivalent initial crack size a in the rubber blank material₀Under the condition of preset strain epsilon, according to the formulaAnd calculating the corresponding fatigue life N to obtain a strain-life characteristic curve of the rubber material.

In one embodiment, the method further comprises the following steps:

preparing 6 rubber pure shear samples; wherein each of the rubber pure shear samples is a rubber material with a geometric shape which is manufactured according to an aspect ratio of at least 5.

The embodiment of the invention also provides a device for acquiring the strain-life characteristic curve of the rubber material, which comprises the following components:

the first acquisition unit is used for acquiring the static strength parameters and the critical tearing energy T of the 3 rubber pure shear samples after the quasi-static tensile property test_c；

The second acquisition unit is used for acquiring fatigue crack propagation test data of the other 3 rubber pure shear samples under the loading of the constant strain rate amplitude variation value; the fatigue crack propagation test data comprise the crack length a and the corresponding cycle number N of the pure rubber shear test sample, and stress and strain data in an effective area of the pure rubber shear test sample;

the model acquisition unit is used for establishing a crack propagation life model according to the fatigue crack propagation test data of the 3 rubber pure shear samples;

a strain-life characteristic curve obtaining unit for obtaining the equivalent initial crack size a according to the crack propagation model of the rubber material and the rubber blank material₀And acquiring a strain-life characteristic curve of the rubber material under the condition of a preset strain epsilon.

In one embodiment, the model obtaining unit is specifically configured to:

performing data fitting on local test data of the fatigue crack propagation test data scatter diagram of the 3 rubber pure shear samples based on a function polynomial method, and obtaining corresponding crack propagation rate by derivationFurther, different cycle numbers N are obtained_iCorresponding crack propagation rate

Based on different cycle numbers N_iDetermining the strain energy density W by an integral mode according to a stress and strain data curve in the effective area of the rubber pure shear sample, and further determining the tearing energy T (Wh) of the rubber pure shear sample₀；

Based on the crack propagation rate obtainedAnd tear energy T, based on the number of cycles N, paired to form a crack propagation rateDetermining source data related to the tearing energy T;

AT based on the power law of crack propagation model^FDetermining parameters A and F of a crack propagation model based on the source data and a least squares fit;

based on the crack propagation model with the determined model parameters A and F, the calculation formula of the crack propagation life obtained through integration is as follows:wherein, a₀To equivalent initial crack size, a_fThe maximum allowable crack size for the material at which fatigue fracture occurs.

In one embodiment, the strain-life characteristic curve obtaining unit is specifically configured to:

according to the crack propagation model of the rubber material and the equivalent initial crack size a in the rubber blank material₀Under the condition of preset strain epsilon, according to the formulaAnd calculating the corresponding fatigue life N to obtain a strain-life characteristic curve of the rubber material.

The embodiment of the invention also provides computer terminal equipment which comprises one or more processors and a memory. A memory coupled to the processor for storing one or more programs; when the one or more programs are executed by the one or more processors, the one or more processors implement the method for obtaining a strain-life characteristic curve of a rubber material as in any one of the above embodiments.

Embodiments of the present invention further provide a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the method for acquiring the strain-life characteristic curve of the rubber material according to any one of the above embodiments is implemented.

Compared with the prior art, the method and the device for acquiring the strain-life characteristic curve of the rubber material, the computer terminal equipment and the computer readable storage medium have the advantages that:

according to the invention, the acquisition of the original data of the fatigue characteristic test can be completed only by 6 rubber pure shear samples and 3 standard dumbbell-shaped samples, and the acquisition of the strain-life (epsilon-N) characteristic curve can be completed by processing the original test data by combining a fracture mechanics related theoretical formula and a rubber fatigue damage mechanism, so that the problems of long test period, large number of samples and the like of a conventional strain-life (epsilon-N) curve are solved. Therefore, compared with the traditional strain-life (epsilon-N) curve test scheme, the method has the advantages of small investment time and low test investment cost, and the method is greatly improved in both cost time and data precision.

Drawings

In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic diagram of a basic flow chart of a method for obtaining a strain-life characteristic curve of a rubber material according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a rubber pure shear sample provided in an embodiment of the present invention;

FIG. 3 is a schematic diagram of the loads applied in a fatigue crack growth test of a rubber material according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be understood that the step numbers used herein are for convenience of description only and are not used as limitations on the order in which the steps are performed.

It is to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the specification of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

The terms "comprises" and "comprising" indicate the presence of the described features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.

The term "and/or" refers to and includes any and all possible combinations of one or more of the associated listed items.

The embodiment of the invention provides a method for acquiring a strain-life characteristic curve of a rubber material, which comprises the following steps:

obtaining the static strength parameter and the critical tearing energy T of 3 rubber pure shear samples after the quasi-static tensile property test_c；

Acquiring fatigue crack propagation test data of the other 3 rubber pure shear samples under the loading of constant strain rate amplitude variation values; the fatigue crack propagation test data comprise the crack length a and the corresponding cycle number N of the pure rubber shear test sample, and stress and strain data in an effective area of the pure rubber shear test sample;

establishing a crack propagation life model according to the fatigue crack propagation test data of the 3 rubber pure shear samples;

according to the crack propagation model of the rubber material and the equivalent initial crack size a in the rubber blank material₀And acquiring a strain-life characteristic curve of the rubber material under the condition of a preset strain epsilon.

As can be seen from the above, the efficient test method and the data processing method for the strain-life (e-N) characteristic curve of the rubber material provided in the embodiment of the present invention, as shown in fig. 1, may have the following steps as a whole:

1) preparing 6 pure rubber shear samples;

2) obtaining static strength parameters of the rubber material;

3) performing a rubber material fatigue crack propagation test and data recording under the loading of a constant strain rate variable amplitude value;

4) analyzing rubber crack propagation actual measurement data and establishing a crack propagation life model;

5) determining the size of the equivalent initial crack of the blank;

6) and (3) determining a strain-life (epsilon-N) curve of the rubber material.

Referring to fig. 2, fig. 2 is a schematic structural diagram of a rubber pure shear sample according to an embodiment of the present invention.

In one embodiment, 6 rubber pure shear samples are prepared for step 1); wherein each rubber pure shear sample is a rubber material with a geometric shape and manufactured according to an aspect ratio of at least 5, and the rubber pure shear sample specifically comprises the following components:

for a rubber material with a specific formula, 6 pure shear samples with proper geometric shapes are prepared according to the required width-height ratio (the minimum is 5), and the mark distance height of the sample is marked as h₀Length l, thickness t.

In one embodiment, the obtaining of the static strength parameter of the rubber material in the step 2) specifically comprises:

taking any 3 pure shear samples in the step 1) as test samples, and carrying out quasi-static tensile property test to obtain the static strength parameter and the critical tearing energy T of the material_cAnd providing a reference for determining the range of the applied load of the subsequent fatigue test.

Referring to fig. 3, fig. 3 is a schematic view of a load applied in a fatigue crack propagation test of a rubber material according to an embodiment of the present invention. In one embodiment, the rubber material fatigue crack propagation test and data recording under the constant strain rate amplitude loading in the step 3) specifically include:

taking the rest 3 pure shear samples in the step 1), setting a certain initial crack (namely forming a prefabricated gap), taking the initial crack as a test sample, and adopting a strain loading mode with constant strain rate to cover a typical load working condition. And recording the crack length a and the corresponding cycle number N of the sample in the test process in real time, and the stress and strain data in the effective area of the sample.

In one embodiment, for the analysis of the actually measured data of the rubber crack growth and the establishment of the crack growth life model in the step 4), namely, the crack growth life model is established according to the fatigue crack growth test data of 3 pure shear samples of the rubber, specifically:

performing data fitting on local test data of the fatigue crack propagation test data scatter diagram of the 3 rubber pure shear samples based on a function polynomial method, and obtaining corresponding crack propagation rate by derivationFurther, different cycle numbers N are obtained_iCorresponding crack propagation rate

Based on different cycle numbers N_iDetermining the strain energy density W by an integral mode according to a stress and strain data curve in the effective area of the rubber pure shear sample, and further determining the tearing energy T (Wh) of the rubber pure shear sample₀；

Based on the crack propagation rate obtainedAnd tear energy T, based on the number of cycles N, paired to form a crack propagation rateDetermining source data related to the tearing energy T;

AT based on the power law of crack propagation model^FDetermining parameters A and F of a crack propagation model based on the source data and a least squares fit;

based on the crack propagation model with the determined model parameters A and F, the calculation formula of the crack propagation life obtained through integration is as follows:wherein, a₀Is the equivalent initial crack size (as shown in FIG. 2), a_fThe maximum allowable crack size for the material at which fatigue fracture occurs.

In one embodiment, for the step 5) of determining the equivalent initial crack size of the blank, specifically:

adopting a dumbbell-shaped test sample in the standard ASTM D412 to carry out a tensile fatigue failure test, measuring 3 data points, and combining the crack propagation life calculation formula to calibrate the equivalent initial crack size a in the rubber blank material₀*。

Wherein, for the dumbbell type test specimen, a_f＝T_c2kW, T2 kWa, where W is the strain energy density,T_ccritical tearing energy.

In one embodiment, for the step 6), the strain-life (epsilon-N) curve of the rubber material is determined according to the crack propagation model of the rubber material and the equivalent initial crack size a in the rubber blank material₀Acquiring a strain-life characteristic curve of the rubber material under a preset strain epsilon condition, specifically:

when determining the equivalent initial crack size a in the rubber blank material based on the test data and the data processing method of the steps 1) to 5)₀After the model of the crack propagation of the rubber material, according to the crack propagation model of the rubber material and the equivalent initial crack size a in the rubber blank material₀At a predetermined strain epsilon conditionIs expressed by the following formulaAnd calculating the corresponding fatigue life N to obtain a strain-life characteristic curve of the rubber material.

In summary, the invention provides a method for acquiring a strain-life (epsilon-N) characteristic curve of a rubber material, which comprises the following steps: for a rubber material with a specific formula, 6 pure shear samples with proper geometric shapes are manufactured according to the required width-to-height ratio (the minimum is 5) and are used for carrying out acquisition of static strength parameters of the rubber material and fatigue crack propagation tests; selecting 3 samples to carry out a quasi-static breaking test so as to obtain static strength parameters and critical tearing energy values of the rubber material; selecting 3 pure shear samples with prefabricated notches, carrying out a rubber material fatigue crack propagation test by adopting a constant strain rate variable amplitude loading mode, and recording the length of cracks on the samples, the corresponding cycle times and stress and strain data in an effective area on the samples in the test process in real time; establishing a crack propagation life model based on the analysis of the actually measured data of the rubber crack propagation; calibrating the equivalent initial crack size of the blank based on 3 fatigue failure test data points of the dumbbell-shaped test sample; and determining a strain-life (epsilon-N) curve of the rubber material.

Therefore, the method for acquiring the strain-life (epsilon-N) characteristic curve of the rubber material can acquire the original data of the fatigue characteristic test by only needing 6 pure rubber shear samples and 3 standard dumbbell-shaped samples, and can acquire the strain-life (epsilon-N) characteristic curve by processing the original test data by combining a fracture mechanics related theoretical formula and a rubber fatigue damage mechanism, so that the problems of long test period, large number of samples and the like of the conventional strain-life (epsilon-N) curve are solved. Therefore, compared with the traditional strain-life (epsilon-N) curve test scheme, the method for acquiring the strain-life (epsilon-N) characteristic curve of the rubber material has the advantages of small investment time and low test investment cost, and the cost time and the data precision are greatly improved.

The embodiment of the invention also provides a device for acquiring the strain-life characteristic curve of the rubber material, which comprises the following components:

the first acquisition unit is used for acquiring the static strength parameters and the critical tearing energy T of the 3 rubber pure shear samples after the quasi-static tensile property test_c；

The second acquisition unit is used for acquiring fatigue crack propagation test data of the other 3 rubber pure shear samples under the loading of the constant strain rate amplitude variation value; the fatigue crack propagation test data comprise the crack length a and the corresponding cycle number N of the pure rubber shear test sample, and stress and strain data in an effective area of the pure rubber shear test sample;

the model acquisition unit is used for establishing a crack propagation life model according to the fatigue crack propagation test data of the 3 rubber pure shear samples;

a strain-life characteristic curve obtaining unit for obtaining the equivalent initial crack size a according to the crack propagation model of the rubber material and the rubber blank material₀And acquiring a strain-life characteristic curve of the rubber material under the condition of a preset strain epsilon.

For the specific definition of the device for acquiring the strain-life characteristic curve of the rubber material, reference may be made to the above definition of the method for acquiring the strain-life characteristic curve of the rubber material, and details are not repeated here. The modules in the device for acquiring the strain-life characteristic curve of the rubber material can be wholly or partially realized by software, hardware and a combination thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.

In one embodiment, the model obtaining unit is specifically configured to:

performing data fitting on local test data of the fatigue crack propagation test data scatter diagram of the 3 rubber pure shear samples based on a function polynomial method, and obtaining corresponding crack propagation rate by derivationFurther, different cycle numbers N are obtained_iCorrespond toCrack propagation rate of

Based on different cycle numbers N_iDetermining the strain energy density W by an integral mode according to a stress and strain data curve in the effective area of the rubber pure shear sample, and further determining the tearing energy T (Wh) of the rubber pure shear sample₀；

Based on the crack propagation rate obtainedAnd tear energy T, based on the number of cycles N, paired to form a crack propagation rateDetermining source data related to the tearing energy T;

AT based on the power law of crack propagation model^FDetermining parameters A and F of a crack propagation model based on the source data and a least squares fit;

based on the crack propagation model with the determined model parameters A and F, the calculation formula of the crack propagation life obtained through integration is as follows:wherein, a₀To equivalent initial crack size, a_fThe maximum allowable crack size for the material at which fatigue fracture occurs.

In one embodiment, the strain-life characteristic curve obtaining unit is specifically configured to:

according to the crack propagation model of the rubber material and the equivalent initial crack size a in the rubber blank material₀Under the condition of preset strain epsilon, according to the formulaAnd calculating the corresponding fatigue life N to obtain a strain-life characteristic curve of the rubber material.

The embodiment of the invention also provides computer terminal equipment which comprises one or more processors and a memory. The memory is coupled to the processor and is configured to store one or more programs, and when the one or more programs are executed by the one or more processors, the one or more processors implement the method for obtaining the strain-life characteristic curve of the rubber material in any of the above embodiments.

The processor is used for controlling the overall operation of the computer terminal equipment so as to complete all or part of the steps of the method for acquiring the strain-life characteristic curve of the rubber material. The memory is used to store various types of data to support the operation at the computer terminal device, which data may include, for example, instructions for any application or method operating on the computer terminal device, as well as application-related data. The Memory may be implemented by any type of volatile or non-volatile Memory device or combination thereof, such as Static Random Access Memory (SRAM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Erasable Programmable Read-Only Memory (EPROM), Programmable Read-Only Memory (PROM), Read-Only Memory (ROM), magnetic Memory, flash Memory, magnetic disk, or optical disk.

In an exemplary embodiment, the computer terminal Device may be implemented by one or more Application Specific 1 integrated circuits (AS 1C), a Digital Signal Processor (DSP), a Digital Signal Processing Device (DSPD), a Programmable Logic Device (PLD), a Field Programmable Gate Array (FPGA), a controller, a microcontroller, a microprocessor or other electronic components, and is configured to perform the above-mentioned method for obtaining the strain-life characteristic curve of the rubber material, and achieve the technical effects consistent with the above-mentioned method.

In another exemplary embodiment, there is also provided a computer readable storage medium including program instructions, which when executed by a processor, implement the steps of the method for acquiring a strain-life characteristic curve of a rubber material in any one of the above embodiments. For example, the computer readable storage medium may be the above-mentioned memory including program instructions, which can be executed by a processor of a computer terminal device to implement the above-mentioned method for obtaining the strain-life characteristic curve of the rubber material, and achieve the technical effects consistent with the above-mentioned method.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.