Fracture toughness behavior of metal matriz composites by continuum damage modeling
Short fiber reinforced metal-matrix composites (MMCs) have been widely adopted as structural materials and many experimental researches have been performed to study fracture toughness of the composite.Fracture toughness is often referred as the plane strain(maximum constraint) fracture toughness KIc determined by the well-established standard test method,such as ASTM E399.But the application for dynamic fracture toughness KId has not been popular yet,because of reliance in capturing the crack propagating time.This paper deals with dynamic fracture toughness test and simulation using finite element method to evaluate fracture behaviors of MMCs manufactured by squeeze casting process when material combination is varied with the type of reinforcement (appearance,size),volume fraction and combination of reinforcements,and the matrix alloy.The instrumented Charphy impact test was used for KId determination and continuum damage model embedded in commercial FE program is used to investigate the dynamic fracture toughness with the influence of elasto-visco-plastic constitutive relation of quasi-brittle fracture that is typical examples of ceramics and some fibre reinforced composites.By comparing results between experimental method and FE simulation,the determination process for KId is presented.FE simulation coupled with continuum damage model is emphasized with single shot simulation which can predict the dynamic fracture toughness,KId and real time evolution of that directly.
Static and dynamic fracture toughness Continuum damage mechanics Metal-matriz composites Reinforcements Volume fraction Finite element method Charpy impact test
Y.Shi I.T.Lee J.I.Song
Department of Mechanical Engineering,Changwon National University,9 Sarim-Dong,Changwon 641-773,Gyeo Department of Mechanical Engineering & Intelligent Systems,University of Electro-Communication Chofu
国际会议
成都
英文
139-144
2009-10-16（万方平台首次上网日期，不代表论文的发表时间）