CN-121835216-B - True triaxial stress environment crack propagation simulation method of intelligent sensing element

CN121835216BCN 121835216 BCN121835216 BCN 121835216BCN-121835216-B

Abstract

The invention relates to the technical field of intelligent sensing element performance test, in particular to a true triaxial stress environment crack propagation simulation method of an intelligent sensing element, which comprises the following steps of collecting service environment characteristics and body characteristic parameters of the intelligent sensing element, establishing a true triaxial stress simulation basic information base of the sensing element, wherein the service environment characteristics comprise triaxial stress coupling parameters, stress dynamic change parameters and service medium influence parameters, and the body characteristic parameters comprise mechanical characteristics, configuration parameters, initial sensing performance and background data; based on a true triaxial stress simulation basic information base, a multi-field coupling association rule base integrating a stress field, a deformation field and a sensing field is integrated. The true triaxial stress environment crack propagation simulation method for the intelligent sensing element provided by the invention greatly improves the coincidence degree of the crack propagation rule and the actual situation, and provides a reliable basis for accurately reflecting the element failure mechanism.

Inventors

LIU YANG
An Zhihai
PENG CHAO
WU QINZHENG
LIU XINGQUAN
LI GUILIN
LUO YIFAN

Assignees

山东黄金矿业科技有限公司深井开采实验室分公司

Dates

Publication Date: 20260508
Application Date: 20260313

Claims (8)

1. The true triaxial stress environment crack propagation simulation method of the intelligent sensing element is characterized by comprising the following steps of: Acquiring service environment characteristics and body characteristic parameters of an intelligent sensing element, and establishing a true triaxial stress simulation basic information base of the sensing element, wherein the service environment characteristics comprise triaxial stress coupling parameters, stress dynamic change parameters and service medium influence parameters, and the body characteristic parameters comprise mechanical characteristics, configuration parameters, initial sensing performance and background data; based on a true triaxial stress simulation basic information base, integrating a stress field, a deformation field and a multi-field coupling association rule base of a sensing field, and generating an initial crack expansion simulation scheme of the sensing element; Based on an initial crack extension simulation scheme, accurate clamping and stress loading are carried out on a sensor element sample, and full-dimension monitoring, real-time stress and deformation detection and sensing performance dynamic obtaining simulation interaction data are acquired; performing feature extraction and error judgment on the simulation interaction data, and feeding the features of the simulation interaction data back to a multi-field coupling association rule base to obtain a secondary crack expansion simulation scheme; generating a multi-dimensional crack-resistant lifting scheme based on a crack evolution rule and a sensing performance failure mechanism of the secondary crack extension simulation scheme; And verifying the anti-cracking lifting scheme based on the simulation data to output a final scheme of simulation optimization.
2. The method for simulating the true triaxial stress environment crack propagation of the intelligent sensing element according to claim 1 is characterized by collecting service environment characteristics and body characteristic parameters of the intelligent sensing element and establishing a true triaxial stress simulation basic information base of the sensing element, and specifically comprises the following steps: Acquiring triaxial stress amplitude, stress loading rate, cyclic loading and unloading times, stress coupling proportion and environmental characteristic parameters of temperature, humidity and corrosiveness of a service medium of an actual service scene of a sensing element, and establishing a service environment characteristic sub-library; Acquiring the mechanical characteristics of material elastic modulus, poisson ratio and fracture toughness of a sensing element, and background data of structural geometric dimensions, structural parameters of microstructure distribution and the position, size, shape and distribution density of initial micro defects; The acquisition equipment measures initial sensing performance parameters of resistance, capacitance, sensitivity and signal output stability in the stress-free state of the sensing element, and integrates mechanical characteristics, configuration parameters, initial sensing performance and background data into a body characteristic parameter sub-library; And constructing a true triaxial stress simulation basic information base based on the service environment characteristic sub-base and the body characteristic parameter sub-base.
3. The true triaxial stress environment crack propagation simulation method of the intelligent sensing element according to claim 2, wherein the method comprises the following steps of: based on a true triaxial stress simulation basic information base, a multi-field coupling association rule base integrating a stress field, a deformation field and a sensing field is adopted to generate an initial crack expansion simulation scheme of the sensing element, and the method specifically comprises the following steps: stress field data, deformation field simulation data, sensing field simulation data and crack evolution data are collected, and a multi-field coupling association rule base is constructed; Digging a multi-field coupling association rule base based on association data of a true triaxial stress simulation basic information base to generate a basic standard base; And judging the synergistic effect of the basic standard libraries in the multi-field coupling association rule library to generate an initial crack extension simulation scheme.
4. The true triaxial stress environment crack propagation simulation method of the intelligent sensing element according to claim 3 is characterized by comprising the following steps of accurately clamping and loading the sensing element sample based on an initial crack propagation simulation scheme, collecting full-dimension monitoring of cracks, real-time detection of stress and deformation and dynamic acquisition of simulation interaction data of sensing performance: Establishing a simulation test standard library based on a true triaxial stress loading unit, a multidimensional monitoring unit, a sensing performance acquisition unit and a central control unit, and comparing the true triaxial stress of a parameter sample of an initial crack expansion simulation scheme according to the simulation test standard library to obtain a target stress value; carrying out full-dimension monitoring on the crack based on a multi-dimension monitoring unit, and obtaining micro-crack evolution characteristics, a crack penetration process and integral deformation of a sample to obtain a sample characteristic change value; acquiring dynamic change data in a true triaxial stress loading unit and the deformation quantity and deformation rate of a sample in a sensing performance acquisition unit to obtain a stress change rate value; establishing a real-time data interaction rule of a simulation test standard library based on a central control unit; And comparing the target stress value, the sample characteristic change value and the stress change rate value with the real-time data interaction rule to obtain simulation interaction data.
5. The method for simulating the crack propagation of the true triaxial stress environment of the intelligent sensing element according to claim 4, wherein the method is characterized by performing feature extraction and error judgment on simulated interaction data, and feeding the features of the simulated interaction data back to a multi-field coupling association rule base to obtain a secondary crack propagation simulation scheme, and specifically comprises the following steps: Comparing the extracted characteristic parameters with real-time calculation results of a multi-field coupling association rule base to obtain characteristic deviation values, and determining characteristic parameter error points of stress fields, deformation fields and crack evolution in the multi-field coupling association rule base based on the characteristic deviation values; Correcting and iterating related parameters of the multi-field coupling association rule base according to the characteristic deviation value and the characteristic parameter error point to obtain a characteristic optimization value; Comparing the feature optimization value with a preset simulation precision threshold value to obtain a simulation optimization library; and generating a secondary crack extension scheme based on the full-flow simulation of the crack extension of the sensor element in the true triaxial stress environment by the simulation optimization library.
6. The method for simulating the crack propagation of the true triaxial stress environment of the intelligent sensing element according to claim 5, wherein the method is characterized in that a simulated optimization library is obtained by comparing a characteristic optimization value with a preset simulated precision threshold value, and specifically comprises the following steps: If the feature optimization value is smaller than the simulation precision threshold value, generating a simulation optimization library; And if the characteristic optimization value is larger than or equal to the simulation precision threshold value, correcting, iterating and optimizing the related parameters of the multi-field coupling association rule base according to the characteristic deviation value and the characteristic parameter no-difference point until the characteristic optimization value is smaller than the simulation precision threshold value, and generating a simulation optimization base.
7. The method for simulating crack propagation in a true triaxial stress environment of an intelligent sensing element according to claim 6, wherein the method is characterized by generating a multi-dimensional crack-resistant lifting scheme based on a crack evolution rule and a sensing performance failure mechanism of a secondary crack propagation simulation scheme, and specifically comprises the following steps: judging a crack initiation mechanism and an expansion rule of the sensing element under the coupling action of true triaxial stress and the influence of different stress characteristics on crack evolution based on a secondary crack expansion simulation scheme to obtain a crack evolution rule; obtaining a sensing performance failure mechanism based on the corresponding relation between each stage of crack expansion and sensing performance attenuation; Generating a multi-dimensional optimization scheme from four dimensions of structural design optimization, material modification strengthening, sensing unit protection and stress adaptation regulation and control according to a crack evolution rule and a sensing performance failure mechanism: and comparing and verifying the multidimensional optimization scheme with the simulation optimization library, and screening out the optimization scheme with the optimal verification effect to obtain the anti-cracking lifting scheme.
8. The method for simulating the crack propagation in the true triaxial stress environment of the intelligent sensing element according to claim 7, further comprising: Basic information base data, simulation schemes, test data, simulation results and effective optimization schemes of sensing elements of different types and different specifications are collected, and an intelligent database for simulating the true triaxial stress crack propagation of the intelligent sensing element is constructed; and generating a simulation preselection scheme based on the intelligent database matching the service environment characteristics and the body characteristic parameters of the sensing element.

Description

True triaxial stress environment crack propagation simulation method of intelligent sensing element Technical Field The invention relates to the technical field of performance test of intelligent sensing elements, in particular to a true triaxial stress environment crack propagation simulation method of an intelligent sensing element. Background The intelligent sensing element is used as a core device for sensing external physical quantity and is widely applied to the fields of aerospace, geotechnical engineering, precision instruments and biomedical science. In the actual service process, the intelligent sensing element is always in a complex three-dimensional stress environment, for example, the sensing element on an aeroengine blade needs to bear the coupling effect of multidirectional thermal stress and mechanical stress, the buried sensing element in geotechnical engineering needs to bear the true triaxial pressure exerted by surrounding soil, and the complex stress is extremely easy to cause microcracks to be generated in the sensing element and gradually expand, so that the sensing precision is finally reduced, signal distortion and even device failure are finally caused, and the stability and safety of the whole detection system are seriously influenced. However, the existing simulation method for the crack propagation in the true triaxial stress environment mostly adopts uniaxial or biaxial stress loading simulation, ignores the coupling effect of the three-dimensional stress in actual service, is difficult to truly restore the complex stress state born by the sensing element, causes larger deviation between the simulated crack propagation rule and the actual condition, and is difficult to accurately reflect the actual failure mechanism of the element. Disclosure of Invention The invention aims to overcome the defects in the prior art and provides a true triaxial stress environment crack propagation simulation method of an intelligent sensing element. In order to solve the technical problems, the invention provides a true triaxial stress environment crack propagation simulation method of an intelligent sensing element, which comprises the following steps: Acquiring service environment characteristics and body characteristic parameters of an intelligent sensing element, and establishing a true triaxial stress simulation basic information base of the sensing element, wherein the service environment characteristics comprise triaxial stress coupling parameters, stress dynamic change parameters and service medium influence parameters, and the body characteristic parameters comprise mechanical characteristics, configuration parameters, initial sensing performance and background data; based on a true triaxial stress simulation basic information base, integrating a stress field, a deformation field and a multi-field coupling association rule base of a sensing field, and generating an initial crack expansion simulation scheme of the sensing element; Based on an initial crack extension simulation scheme, accurate clamping and stress loading are carried out on a sensor element sample, and full-dimension monitoring, real-time stress and deformation detection and sensing performance dynamic obtaining simulation interaction data are acquired; performing feature extraction and error judgment on the simulation interaction data, and feeding the features of the simulation interaction data back to a multi-field coupling association rule base to obtain a secondary crack expansion simulation scheme; generating a multi-dimensional crack-resistant lifting scheme based on a crack evolution rule and a sensing performance failure mechanism of the secondary crack extension simulation scheme; And verifying the anti-cracking lifting scheme based on the simulation data to output a final scheme of simulation optimization. Preferably, service environment characteristics and body characteristic parameters of the intelligent sensing element are collected, and a true triaxial stress simulation basic information base of the sensing element is established, and the method specifically comprises the following steps: Acquiring triaxial stress amplitude, stress loading rate, cyclic loading and unloading times, stress coupling proportion and environmental characteristic parameters of temperature, humidity and corrosiveness of a service medium of an actual service scene of a sensing element, and establishing a service environment characteristic sub-library; Acquiring the mechanical characteristics of material elastic modulus, poisson ratio and fracture toughness of a sensing element, and background data of structural geometric dimensions, structural parameters of microstructure distribution and the position, size, shape and distribution density of initial micro defects; The acquisition equipment measures initial sensing performance parameters of resistance, capacitance, sensitivity and signal output stability in the stress-free state of the