延性金属材料中损伤分布的统计方法  

Statistic Analysis of Damage Distribution in Ductile Metals under Dynamic Impact

作　　者：祁美兰[1] 贺红亮[2] 

机构地区：[1]武汉理工大学理学院,武汉430070 [2]中国工程物理研究院流体物理研究所冲击波物理与爆轰物理实验室,绵阳621900

出　　处：《武汉理工大学学报》2008年第8期23-26,共4页Journal of Wuhan University of Technology

基　　金：国家自然科学基金NSAF项目(10476027);冲击波物理与爆轰物理重点实验室基金(9140C67010100701)

摘　　要：基于体视金相学中的Schwartz-Saltykov方法,讨论了动态冲击下延性金属材料中的损伤分布,对微孔洞的面密度、体密度以及损伤度等特征物理量进行了分析。针对层裂损伤试样微孔洞统计子样少等问题,对Schwartz-Saltykov方法计算的损伤统计进行了修正。统计结果较好地描述了延性金属材料内部微损伤的分布及演化特征,为层裂损伤的理论建模、数值模拟提供了物理依据。Statistic analyses of the void characters, such as two-dimensional size distribution, three-dimensional size distribu- tion and damage, etc. for the spall damage of ductile metals under the dynamic impact loading has been established in terms of the Schwartz-Saltykov method. Given that the counted number of voids from the spall fracture sample was a few, its influence on the statistic analysis has been discussed, and a modification was proposed to compensate the three-dimensional size distribu- tion being underestimated. Results indicated that the damage distribution obtained by the modified calculation had well described the evolution characteristic of micro-voids inside the ductile sample; it therefore provided a physical basis for the theory modeling and numerical simulation of spall fracture.

关 键 词：冲击波 延性金属 损伤 统计分析 

分 类 号：O346.1[理学—固体力学]