Study on Muti-Scale Simulation Methods for Damage and Failure of Two-Phase Composite Materials

Author:Zhao Shuai

Supervisor:wang xiao gui xu yang jian

Database:Doctor

Degree Year:2019

Download:10

Pages:136

Size:5380K

Keyword:

With the rapid development of science and technology,composite materials in industrial production have gradually occupied an important position.At the same time,"Made in China 2025" promulgated by the State Council has also provided strategic support and security for composite materials.Two-phase composite materials are the foundation of manufacturing industry.It has important significance and engineering value for the research of multi-scale simulation methods.At the same time,damage and failure studies have been always a concern of the industry.Therefore,the multi-scale simulation methods for damage and failure of two-phase composite materials are the important research topic in the characterization of material reliability.Due to large differences in material properties between macroscale and mesoscale,it has become increasingly difficult to accurately simulate and predict the damage and failure of two-phase composite materials using traditional macroscopic methods.Mesoscale and two-scale analysis are effective ways to solve the above problems.In this paper,a variety of model construction methods for approximating the real organizational structure were proposed.Through analyses of mesoscale and two-scale between macroscale and mesoscale,related experimental tests and analytical solution verification,the damage and failure processes of two-phase composite materials were studied.The main researches carried out in this paper are as follows:Accurate model parameter characterization is essential for multi-scale simulation.Inverse analysis is an important method for parameter characterization.In this paper,a novel inverse analysis method was proposed based on the Kalman filtering algorithm(KFA)and the response surface interpolation technique.The response surface interpolation technique can quickly improve the computational efficiency,but at the same time introduce a large error.For this problem,this paper further proposed a narrow-scale inverse analysis method to predict the parameters of cohesive zone model(CZM).The simulation and inverse analyses based on the mode I and II fracture pseudo-experiment and real experiment of SAC-Cu solder interface proved that the method has high robustness and accuracy,and can better solve the cohesive parameter identification problem of complex interface failure.They laid the foundation for multiscale damage and failure simulation analyses of composite materials.Aiming at the network material with non-uniform distribution of reinforcement phase,a set of mesoscopic modeling methods were proposed,which can generate geometric models that better approximates the real organizational structure.Combined with the constitutive relationship of strain gradient hardening with scale effect and quench hardening,the elastoplastic analysis of representative volume element(RVE)was carried out,and the reliability of the method was verified.The meso-mechanical properties of the network structure materials were revealed by the study of the simplification,strengthening mechanism and distribution of the reinforcement phase.Secondly,aiming at the damage and failure of particle reinforced materials with uniform distribution of reinforcement phase,a mesoscopic modeling method combining image method and parameter method,a scheme for building aggregate library and a method for rapidly embedding cohesive element were proposed,which can randomly generate aggregates with different contents and different distributions.Based on the secondary development of ABAQUS and the derivation of related formulas,the research strategy of combining CZM and explicit dynamics analysis was proposed.Using the above methods,the mechanical behaviors of concrete material damage and failure were accurately predicted.The construction methods of these two mesoscopic models can provide reference for other similar composite material simulation.Based on the computational homogenization theory,an efficient two-scale computational method based on commercial finite element software ABAQUS and parallel computing technology was proposed.This method broke the limitation of the ABAQUS/Standard non-parallel computing framework and effectively solved the problem of low computational efficiency of the customary two-scale simulation method.The feasibility and efficiency of the parallel method were verified by the two-scale analysis of particle reinforced materials through the comparison of computational efficiency of different methods.Finally,based on the computational homogenization theory and CZM,the two-scale computational formulas with interface were derived,and the double cantilever beam(DCB)experiment with holes was used to study the two-scale damage and failure based on the real mesostructure.The debonding evolution law of the interface and the influence of cohesive parameters on the material properties were analyzed.