首页> 美国政府科技报告 >Phenomenology and Numerical Analysis of Relaxation Properties and Failure of Materials with Defects under Dynamic Loading
【24h】

Phenomenology and Numerical Analysis of Relaxation Properties and Failure of Materials with Defects under Dynamic Loading

机译:动载作用下缺陷材料松弛特性及破坏的现象学与数值分析

获取原文

摘要

Statistically based phenomenology of materials with typical mesoscopic defects is developed with the aim to link the behavior of defect ensembles with relaxation ability and failure of materials under dynamic loading and the elaboration of numerical codes for the simulation of fracture and plasticity dynamically loaded materials. Statistical approach allowed the definition of nonlinearity of thermodynamic potential and the description of plastic instability and damage localization as the generation of collective modes in defects ensemble. Experimental study was carried out to confirm the responsibility of these modes for the plastic relaxation and damage localization in dynamically loaded materials. These experiments included the framing and high speed recording of dynamics of crack propagation in PMMA, the investigation of strain-rate sensitivity of copper in the Hopkinson-bar tests, the scaling analysis of failure surfaces with the usage of the high-resolution interferometer. Original finite element code was developed and applied for the simulation of plate impact tests. The applicability of proposed phenomenology was estimated in the course of comparative analysis of plane wave propagation in copper in the framework of developed model, Bodner-Partom and Follansbee models. The analysis revealed the principal limitation of last models for the description of dynamically loaded materials due to the subjective role of the variables responsible for the defect evolution to the stress-strain variables.

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号