混凝土HJC动态本构模型的研究

Research on the HJC dynamic constitutive model for concrete

文章运用显式非线性动力分析软件LS-DYNA,选用HJC动态本构模型对混凝土SHPB试验进行了一系列的数值模拟,对HJC动态本构模型的理论框架以及材料参数的力学特点进行了探讨和研究。研究表明,HJC动态损伤本构模型服从塑性形变理论,但静水压力的影响不能忽略。HJC模型反映了混凝土材料横向效应导致的非力学行为的增强效应,但其大小与材料的失效方式和失效应变数值相关,不能简单地将混凝土材料的应变率效应解释为完全的横向效应。

By using the software LS-DYNA, the numerical simulation of the SHPB test of concrete is carried out with the HJC dynamic constitutive model. The theoretical framework of the HJC dynamic constitutive model as well as the mechanical characteristics of the material parameters is discussed. The results show that the HJC dynamic constitutive model subjects to the theory of plastic deforma- tion, but the influence of hydrostatic pressure can not be ignored. The HJC model reflects the non-mechanical behavior of the enhancement effect, which is caused by transverse effect of concrete materials, and the strength is interrelated with the material failure mode and the value of the failure strain. The strain rate effect of concrete materials cannot be simply explained as the full transverse effect.