CN-121997622-A - Composite material strength parameter inversion method considering in-situ effect in ultralow temperature environment

CN121997622ACN 121997622 ACN121997622 ACN 121997622ACN-121997622-A

Abstract

The invention provides a composite material strength parameter inversion method considering an in-situ effect in an ultralow temperature environment, which is used for obtaining elastic section test data of a composite material unidirectional plate and a composite material laminated plate in the ultralow temperature environment, adopting a composite material finite element model and a particle swarm PSO optimization algorithm, taking a response value of composite material finite element simulation and an elastic section strain response measured by a test as targets, inverting to obtain composite material constitutive parameters, establishing a composite material progressive failure model by combining a composite material failure criterion and a rigidity degradation model, and finally inverting to obtain the composite material strength parameter by adopting the composite material progressive failure model and the PSO optimization algorithm according to the composite material unidirectional plate and the composite material laminated plate failure section test data. The method solves the problem that the strength parameters of the composite material considering the in-situ effect are difficult to obtain accurately in the ultralow temperature environment, is convenient to operate, accurate in parameter obtaining and repeatable to apply, and is used for simulation modeling, strength evaluation and the like of the composite material.

Inventors

LIU BO
PAN JUNMING
YI GUO
CHEN YI
WANG XIAOWEI
SUN ZIQIANG
LIU YIHUI
QIAN JIAN
QI ZHONGCHENG

Assignees

上海航天精密机械研究所

Dates

Publication Date: 20260508
Application Date: 20241107

Claims (9)

1. A composite material strength parameter inversion method considering in-situ effect in ultralow temperature environment is characterized by adopting a composite material finite element model and particle swarm PSO optimization algorithm according to composite material unidirectional plate test data and composite material laminated plate test data in ultralow temperature environment, taking the response value of composite material finite element simulation and elastic section strain response measured by test as targets, inverting to obtain composite material constitutive parameters, establishing a composite material progressive failure model by combining composite material intrinsic parameters with a composite material failure criterion and a rigidity degradation model, and finally adopting a composite material progressive failure model and PSO optimization algorithm according to the composite material unidirectional plate and composite material laminated plate failure section test data in ultralow temperature environment, taking the response value of composite material progressive failure model simulation and the failure section strain response measured by test as targets, inverting to obtain composite material strength parameters.
2. The method for inverting the strength parameters of the composite material taking into account the in-situ effect in the ultra-low temperature environment according to claim 1, wherein the method comprises the following specific steps: S1, acquiring mechanical test data of composite materials in ultralow temperature environment The composite material test data comprise composite material unidirectional plate test data and composite material laminated plate test data; S2 inversion of constitutive parameters of composite material Inverting the elastic section test data of the composite unidirectional plate and the composite laminated plate to obtain material constitutive parameters, firstly establishing a finite element model of a composite test piece, wherein the finite element model has the same boundary and load condition as the test piece in an actual test, and calculating to obtain an elastic section strain response value or data; s3, building a composite material progressive failure model and performing simulation calculation Establishing a composite progressive failure model by utilizing the composite constitutive parameters of S2 and combining an improved Hashin failure criterion and a stiffness degradation model based on energy damage evolution, updating a composite constitutive equation according to stiffness degradation, and calculating a strain response value or data of a failure section of each load step from the beginning of the stiffness degradation to the complete failure; S4, inversion of composite material strength parameters Setting the position information of each particle in the PSO optimization algorithm in S2 as a composite material strength parameter to be inverted, calculating elastic section strain response data of a test piece input by the PSO optimization algorithm and a finite element model of the test piece of the composite material to obtain elastic section strain response data, changing the strain response of a damaged section calculated by the damaged section test data in the ultralow temperature environment in S1 and the progressive failure model of the composite material in S3, and inverting according to the PSO optimization algorithm implementation step in S2 to obtain a composite material strength parameter result.
3. The method for inverting the strength parameters of the composite material taking the in-situ effect into consideration in an ultralow temperature environment according to claim 2, wherein the test data of the unidirectional plate of the composite material comprise a longitudinal stretching and compression test and a transverse compression test.
4. The method for inverting the strength parameters of the composite material taking the in-situ effect into consideration in an ultralow temperature environment according to claim 2, wherein the test data of the composite material laminated plate comprise a longitudinal stretching and compression test, a transverse compression test and a shearing test.
5. The method of inversion of composite strength parameters taking into account in-situ effects in an ultra-low temperature environment according to claim 2, wherein the composite test data comprises elastic segment test data and failure segment test data.
6. The inversion method of composite material strength parameters considering in-situ effect under ultra-low temperature environment according to claim 1, wherein the inversion specific method of the S2 composite material constitutive parameters is as follows: S2.1, obtaining elastic section data of test pieces of the composite unidirectional plate and the laminated plate through the composite mechanical test under the ultralow temperature environment of S1, namely strain response of each test piece (Elastic segment); S2.2, establishing a finite element model of the composite material test piece, wherein the finite element model has the same boundary and load condition as those of the test piece in the actual test, and calculating to obtain the strain response (Elastic segment); S2.3, taking the minimum strain deviation between the finite element calculation strain response and the measurement point as a target, establishing a PSO optimization algorithm, initializing the PSO optimization algorithm, setting a search space of the optimization target, and initializing a particle swarm, a particle velocity and a position vector; S2.4, each particle searches for a target according to the initial position and the speed direction, and the position information of each particle is recorded as Wherein, the Representing coordinates of a search space in which the kth particle is located after the jth iteration; s2.5, calculating response data by using finite element simulation according to the optimal value of the constitutive parameters of the material obtained in the current iteration step; Comparing the simulation response value with the test actual measurement response data, and carrying out matching degree analysis, wherein the matching degree delta match adopts percentage normalization root mean square error definition: wherein ε exp is the experimentally measured strain data, Is the average value of the measured strain data, epsilon sim is the finite element simulation response value; In (a) and (b) a value), Is specifically shown as (M is the number of data sequences, ε i ), Respectively testing the values of the measured strain data in the ultralow temperature tests of different test pieces and the average value of the measured strain data; The particle in the optimal position in the particle swarm is judged by the minimum target of the matching degree delta match and is recorded as the optimal value of the current iteration step S2.6, judging PSO termination conditions, and judging whether the matching degree delta match value is within an error allowable threshold range or not; s2.7, if the value of the inertia factor is not satisfied, calculating the inertia factor, wherein the value of the inertia factor is associated with the iteration times, and the expression is as follows: Wherein J is the current iteration number, J is the total iteration number, s j is the inertia factor corresponding to the jth iteration, s max is the maximum inertia factor initially set, J is smaller when iteration is started, s j is larger at the moment, J gradually approaches to the total iteration number J along with the increase of the iteration number, s j is reduced, so that the PSO optimization algorithm has both rapid convergence speed and high convergence precision, And updating the speed and position information of each particle according to the formula (3): Wherein, the And Velocity and position vectors of particles, j=1, 2,..j, r 1 , and r 2 are random amounts with values in the range of [0,1], and α 1 and α 2 are non-negative acceleration factors, respectively; repeating S2.4 to S2.7 to continuously optimizing the material parameters; And S2.8, stopping iteration when the PSO termination condition criterion is met, and obtaining a material constitutive parameter inversion result.
7. The method for inverting a composite strength parameter taking into account in-situ effects in an ultra-low temperature environment according to claim 6, wherein the allowable threshold range is adjusted according to the parameter inversion accuracy requirement, and is typically 99%.
8. The method for inverting the strength parameter of the composite material taking into account the in-situ effect in the ultra-low temperature environment according to claim 1 or 2, wherein the strength parameter of the composite material comprises the transverse tensile strength and the shear strength of the composite material taking into account the in-situ effect.
9. The method for inverting the strength parameters of the composite material taking the in-situ effect into consideration in an ultralow temperature environment according to claim 1, wherein the test data of the composite material are obtained by loading with a vertical mechanical tester.

Description

Composite material strength parameter inversion method considering in-situ effect in ultralow temperature environment Technical Field The invention relates to the field of composite material mechanical tests and strength evaluation, in particular to a composite material strength parameter inversion method considering in-situ effect in an ultralow temperature environment. Background Along with the continuous improvement of the lightweight requirement of the spacecraft, the composite material has the advantages of high specific strength, light weight, high specific modulus, good fatigue resistance, good vibration damping performance and the like, and is widely applied to the structural members of the spacecraft such as storage tanks, gas cylinders and the like. However, the mass ratio of the composite material storage tank and the composite material gas cylinder in the structural system is high, and the use load environment is extreme, so that the strength evaluation and the design optimization are important factors influencing the overall performance of the spacecraft. At present, only unidirectional plate strength test data are applied to evaluate the laminated plate in the strength evaluation of the composite material, and the mechanical property result of the middle layer often has larger error because the strength of the composite material depends on the thickness of the composite material and the adjacent layering angle, namely an in-situ effect exists. Therefore, the method has the problem that the transverse tensile strength parameter and the shear strength parameter of the composite material considering the in-situ effect cannot be directly obtained only by a test method under the ultralow temperature environment. Disclosure of Invention The invention provides a composite strength parameter inversion method considering in-situ effect in ultralow temperature environment, which adopts a composite finite element model and Particle Swarm (PSO) optimization algorithm according to test data of a composite unidirectional plate and a composite laminated plate in ultralow temperature environment, takes a response value of composite finite element simulation and an elastic section strain response measured by a test as targets, inverts to obtain composite constitutive parameters, then utilizes the composite constitutive parameters and combines a composite failure criterion and a rigidity degradation model to establish a composite progressive failure model, finally adopts the composite progressive failure model and a PSO optimization algorithm according to test data of a failure section of the composite unidirectional plate and the laminated plate in ultralow temperature environment, and inverts to obtain composite strength parameters by taking a response value simulated by the composite progressive failure model and a failure section strain response measured by the test as targets, wherein the composite transverse tensile strength and the shear strength of the composite are considered in-situ effect, and the method comprises the following specific steps: S1, acquiring mechanical test data of composite materials in ultralow temperature environment The composite material test data comprise unidirectional plate test data and laminated plate test data, wherein the unidirectional plate test data comprise longitudinal stretching and compression tests and transverse compression tests; the laminate test data comprises a longitudinal tensile and compression test, a transverse compression test and a shear test, wherein the composite test data comprises elastic section test data and breaking section test data. S2 inversion of constitutive parameters of composite material Inversion is carried out by utilizing the elastic section test data of the composite unidirectional plate and the laminated plate in the S1 to obtain the constitutive parameters of the material; Establishing a finite element model of the composite material test piece, wherein the finite element model has the same boundary and load condition as those of the test piece in the actual test, and calculating to obtain an elastic section strain response value or data; And establishing a PSO optimization algorithm by taking minimum strain deviation between finite element calculation strain response and a measurement point as a target, setting particle position information as a material constitutive parameter to be inverted, carrying out matching degree analysis, judging whether PSO termination conditions are met, and obtaining a material constitutive parameter result through optimization iteration convergence. S3, building a composite material progressive failure model and performing simulation calculation And (3) establishing a composite material progressive failure model by utilizing the material constitutive parameters in the step (S2) and combining an improved Hashin failure criterion and a stiffness degradation model based on energy damage evolution, updatin