학술논문
基于孪晶强化Johnson-Cook本构宏细观仿真模型的镁合金高速冲击变形机理 / High-speed impact deformation mechanism of magnesium alloy based on twin strengthening Johnson-Cook constitutive macro-meso simulation model
Document Type
Academic Journal
Author
Source
中国有色金属学报 / The Chinese Journal of Nonferrous Metals. 33(11):3650-3661
Subject
Language
Chinese
ISSN
1004-0609
Abstract
基于孪晶强化Johnson-Cook本构(J-C本构)构建有限元(Finite element method,FEM)耦合黏塑性自洽模型(Visco-plastic self-consistent model,VPSC)宏细观仿真模型,研究预孪晶AZ31镁合金高速冲击过程的力学响应、变形机制和织构演变.结果表明:基于孪晶强化的J-C本构构建的宏细观仿真模型更能准确地预测高速冲击过程中次要变形机制及织构组分;引入孪晶强化的J-C本构不会对主要变形机制产生影响,主要影响次要变形机制;在次要变形机制中,棱柱面滑移活性的变化影响基面滑移的汇聚效应与锥面滑移的分离效应之间的竞争关系,导致织构的组分和极密度发生变化.该宏细观仿真模型的构建,为研究高速冲击过程中潜在的变形机理提供了参考.
Based on the twin strengthening Johnson-Cook constitutive(J-C constitutive),the finite element method(FEM)coupled visco-plastic self-consistent model(VPSC)macro-meso simulation model was constructed to study the mechanical response,deformation mechanism,and texture evolution of pre-twinned AZ31 magnesium alloy during high-speed impact.The results show that the macro-meso simulation model based on the twin strengthening J-C constitutive model can predict the secondary deformation mechanism and texture components during high-speed impact more accurately.The effect of J-C constitutive strengthened by twinning on the main deformation mechanism could be neglected,while J-C constitutive strengthened by twinning causes a significant influence on the secondary deformation mechanism.In the secondary deformation mechanism,the change of prism slip activity affects the competitive relationship between the convergence effect of basal slip and the separation effect of pyramidalslip,resulting in the change of texture composition and pole density.The construction of the macro-meso simulation model provides a reference to study the potential deformation mechanism during high-speed impact.
Based on the twin strengthening Johnson-Cook constitutive(J-C constitutive),the finite element method(FEM)coupled visco-plastic self-consistent model(VPSC)macro-meso simulation model was constructed to study the mechanical response,deformation mechanism,and texture evolution of pre-twinned AZ31 magnesium alloy during high-speed impact.The results show that the macro-meso simulation model based on the twin strengthening J-C constitutive model can predict the secondary deformation mechanism and texture components during high-speed impact more accurately.The effect of J-C constitutive strengthened by twinning on the main deformation mechanism could be neglected,while J-C constitutive strengthened by twinning causes a significant influence on the secondary deformation mechanism.In the secondary deformation mechanism,the change of prism slip activity affects the competitive relationship between the convergence effect of basal slip and the separation effect of pyramidal