LS-DYNA中混凝土损伤模型(K&C)的基本力学行为分析
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摘要
混凝土构件在冲击动力作用下的损伤模拟一直以来都是一个难题,制约其发展的最重要因素之一便是材料本构模型的合理选择.基于通用动力有限元分析软件LS-DYNA对其中常用的混凝土损伤模型(K&C)的基本力学行为进行分析,包括全过程拉压应力应变关系、网格敏感性和应变率效应等.研究结果有利于进一步理解该材料模型的特性,并为混凝土构件的有限元分析奠定一定的理论基础.
The damage simulation of the concrete members subjected to impact loads has always been a difficult problem,and one of the most important factors that limit its development is the rational selection of the material constitutive model.In this paper,based on the general dynamic finite element analysis software LS-DYNA,the basic mechanical behavior of a commonly used concrete damage model(K&C)is analyzed,including the whole process stress-strain relationships under uniaxial tension and compression,grid sensitivity and the strain rate effect and so on.The results of this study are helpful to further understand the characteristics of this material model,and lay a certain theoretical basis for the finite element analysis of concrete member under impact loads.
The damage simulation of the concrete members subjected to impact loads has always been a difficult problem,and one of the most important factors that limit its development is the rational selection of the material constitutive model.In this paper,based on the general dynamic finite element analysis software LS-DYNA,the basic mechanical behavior of a commonly used concrete damage model(K&C)is analyzed,including the whole process stress-strain relationships under uniaxial tension and compression,grid sensitivity and the strain rate effect and so on.The results of this study are helpful to further understand the characteristics of this material model,and lay a certain theoretical basis for the finite element analysis of concrete member under impact loads.
引文
[1]Ls-Dyna.LS-DYNA Keyword User’s Manual.Version971[R].Livermore:Livermore Software Technology Corporation,2010.
[2]Magallanes J M,Wu Y,Malvar L J,et al.Recent Improvements to Release III of the K&C Concrete Model[Z].Dearborn,Michigan:2010:37-48.
[3]Malvar L J,Crawford J E,Wesevich J W,et al.A Plasticity Concrete Material Model for DYNA3D[J].International Journal of Impact Engineering,1997,19(9-10):847-873.
[4]Malvar L J,Crawford J E.Dynamic Increase Factors for Concrete[Z].Orlando:1998.
[2]Magallanes J M,Wu Y,Malvar L J,et al.Recent Improvements to Release III of the K&C Concrete Model[Z].Dearborn,Michigan:2010:37-48.
[3]Malvar L J,Crawford J E,Wesevich J W,et al.A Plasticity Concrete Material Model for DYNA3D[J].International Journal of Impact Engineering,1997,19(9-10):847-873.
[4]Malvar L J,Crawford J E.Dynamic Increase Factors for Concrete[Z].Orlando:1998.