颗粒金属材料冲击压缩细观数值模拟  

Meso-Scale Numerical Simulation of the Shock Compression of Particle Metal Materials

作　　者：乔良[1,2] 张先锋[1] 何勇[1] 史安顺[1,3] 张将[1,4] 

机构地区：[1]南京理工大学智能弹药国防重点学科实验室,江苏南京210094 [2]北京航天长征飞行器研究所,北京100076 [3]中国兵器科学研究院烟台分院,山东烟台264003 [4]中国兵器科学研究院宁波分院,浙江宁波315103

出　　处：《高压物理学报》2013年第6期863-871,共9页Chinese Journal of High Pressure Physics

基　　金：国家自然科学基金(10902053);爆炸科学与技术国家重点实验室开放基金(KFJJ10-6M)

摘　　要：颗粒金属材料的细观特性对其宏观力学性能有着重要影响。为进一步分析颗粒直径、分布、形态、孔隙率等细观特性对宏观冲击响应行为的影响规律,从颗粒金属材料的细观结构入手,经合理简化,建立了能够反映材料细观分布特性的有限元模型。基于AUTODYN有限元计算程序,对颗粒金属材料冲击压缩细观行为进行了数值模拟,确定了典型颗粒金属材料冲击Hugoniot参数,并与已有的实验结果进行了对比。获取了材料细观特性(颗粒粒径、材料密实度)对材料宏观冲击压缩特性的影响规律,并从细观尺度上获取了材料冲击压缩过程中颗粒冲击变形演化及冲击温升情况。结果表明,数值仿真结果与已有实验数据吻合良好,颗粒金属材料的细观特性对其宏观响应行为有较为显著的影响。Meso-scale characteristics of particle metal materials （PMM） play an important role in deter- mining its macro-scale mechanical property. In order to investigate relationship between meso-scale characters （particle size, distribution, morphology, porosity） and macro-scale mechanical property, a FEM meso-scale model which can follow the distribution of real structure was built with reasonable simplification. By exploiting AUTODYN FEM software, shock compression process of PMM was simulated and Hugoniot parameters of typical PMM were extracted. Based on the simulated results, conclusion was made on how the meso-scale characteristics （e. g. theoretical mass density, particle size） make impact on the macro-scale shock compression mechanical property. Deformation morphologies and temperature rise during shock compression were also acquired by simulations. It is shown that the simulated result shows a good agreement with the experiment and the meso-scale char- acteristics of PMM play an important role on its macro-scale property.

关 键 词：颗粒金属材料 冲击压缩 细观模型 Hugoniot参数 数值模拟 

分 类 号：O383[理学—流体力学]