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Numerical Simulation for Ratcheting of Particle Reinforced Metal Matrix Composites Based on Periodical Boundary Condition

Author: JiaoWenWen
Tutor: KangGuoZheng
School: Southwest Jiaotong University
Course: Solid Mechanics
Keywords: Particle reinforced metal matrix composites Ratcheting Random distribution Statistical average Periodic boundary conditions
CLC: TB331
Type: Master's thesis
Year: 2011
Downloads: 97
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Abstract


Material in an asymmetric stress cyclic loading , due to the presence of mean stress , resulting in an average plastic strain along the direction of stress accumulation, which is called ratcheting strain accumulation or ratchet effect (ratcheting). Since the internal structure of the composite material of the complexity of their research conducted ratchet effect becomes difficult and hot , and there have been many experimental and theoretical research. In recent years , thanks to the rapid development of the computer that will be applied to the finite element software ratchet effect on the composite numerical simulation study, not only greatly improve the computational efficiency , and accelerate the progress of experimental and theoretical research . In this paper, 3D elastic-plastic finite element model SiCp/6061Al ratcheting composites studied : ( 1 ) by means of the finite element constitutive already circulating achieve , using a random sequence of adsorption (RSA) and statistical averaging methods , the establishment of three - D multi- particle single- cell model of SiC particle reinforced composites 6061A1 alloy single pull behavior , uniaxial ratcheting finite element analysis, the results showed that: a single numerical simulation results tend to have greater dispersion, statistical averaging method reduces the simulation results dispersed resistance, the resulting regular high credibility. ( 2 ) By Hypermesh software supporting the establishment of periodic boundary conditions may be imposed a three-dimensional finite element model of a single cell . With periodic boundary conditions were used to simplify the boundary conditions on the SiC particle reinforced 6061Al alloy composites uniaxial cyclic deformation behavior simulation results show that : The two boundary conditions have a greater difference calculation results ; compared with the experimental results , the cycle boundary conditions is more reasonable than the simplified boundary conditions . ( 3 ) impose periodic boundary conditions using a three-dimensional finite element unit cell model to simulate the SiC particulate reinforced 6061A1 alloy composites under uniaxial loading and ratcheting single pull , to discuss enhanced particle shape and particle size distribution methods microstructural effects on mechanical properties of composite materials . That: the more the number of particles , the smaller the size , the composite material to resist deformation capability; sharper grain boundaries , the composite materials to enhance the better ; accumulation of particles distribution , the higher the flow stress of the composite material .

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CLC: > Industrial Technology > General industrial technology > Materials science and engineering > Composite materials > Metal composite materials
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