混凝土动态冲击问题的一种欧拉数值方法  

An Eulerian Numerical Method on Dynamic Impact Problem of Concrete

作　　者：何长江[1] 于志鲁[1] 范中波[1] 

机构地区：[1]北京应用物理与计算数学研究所,北京100088

出　　处：《爆炸与冲击》2002年第2期152-157,共6页Explosion and Shock Waves

基　　金：中国工程物理研究院行业预研基金项目 (2 0 0 0 0 6 6 2 )

摘　　要：针对混凝土的动态冲击问题给出了混凝土的Holmquist Johnson Cook本构关系 ,本构关系中的等效强度作为压力、应变率和损伤的函数 ;压力表示为体积应变的函数 ,并考虑了永久破碎的效应 ;积累损伤作为等效塑性应变、塑性体积应变和压力的函数。结合三维弹塑性流体力学欧拉数值方法 ,提出了混凝土的Holmquist Johnson Cook本构关系与欧拉程序相结合的计算方法。介绍了带混凝土Holmquist Johnson Cook本构关系的三维弹塑性流体力学欧拉程序。In this paper, aim at the dynamic impact problem of concrete, the constitutive relation of Holmquist Johnson Cook’s type of concrete is given. In this constitutive relation, the equivalent strength model is viewed as the function of pressure,strain rate and damage. The pressure is deoted by the volumetric strain, and the effect of perfect crush is considered. The accumulated damage model is viewed as the function of equivalent plastic strain, plastic volumetric strain and pressure. Combining the Eulerian numerical method of 3D elastic plastic hydrodynamics, the computational method of coupling Holmquist Johnson Cook constitutive model and the Eulerian method is introduced. The Eulerian code of 3D elastic plastic hydrodynamics containing Holmquist Johnson Cook constitutive relation of concrete is also introduced.

关 键 词：混凝土 本构模型 欧拉方法 动态冲击 等效强度 积累损伤 三维弹塑性流 体力学 

分 类 号：TU528[建筑科学—建筑技术科学]