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多层和多相结构材料的防弹性能数值模拟研究

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        安全与防护协同创新中心

报告题目:多层和多相结构材料的防弹性能数值模拟研究

报告人:郭翔  副教授

             天津大学

报告题目:岩石与岩石类材料在动态载荷和高温作用下的力学性质

报告人:姚伟  博士后

加拿大多伦多大学

时间:2018年1月12日下午14:30

地点:北京理工大学9号教学楼510

个人简介:

郭翔,2006年获香港城市大学博士学位,2011年加入天津大学机械工程学院力学系,副教授,博导。主要从事纳米力学和计算断裂力学研究,发表SCI论文33篇,其中18篇在一区和二区期刊。负责国家自然科学基金青年和面上项目、天津大学“北洋学者”青年骨干教师计划项目,任中国材料研究学会疲劳分会理事,中国材料研究学会镁合金分会青年委员会委员,天津市力学学会复合材料专业委员会副秘书长,进入天津市高校“131”创新型人才计划。2016年获杜庆华力学与工程优秀青年学者奖。

报告摘要:

      In the first part of this talk, a theoretical framework and numerical scheme, based on the combination of a strain gradient plasticity theory, micromechanics of composite model, the Johnson–Cook failure model, and the extended Drucker–Prager plasticity model, are employed to investigate a two-layered structure of nanostructured (NS) metal and ceramic.

In the second part of this talk, the strain gradient plasticity and the Johnson–Cook failure criterion are employed to uncover the effects of twin spacing, microstructural attributes, and the volume fraction of the NT regions on the overall ballistic performance of coarse-grained metals strengthened by nanotwinned (NT) regions. Their ballistic performance is quantified by the limit velocity and the limit displacement.

个人简介:

姚伟2017年在加拿大多伦多大学土木工程系做博士后,2017年获多伦多大学哲学博士,2008年和2006年分别获得北京理工大学工程力学硕士和学士。主要研究方向为材料动力学,岩土工程,断裂力学,水压致裂,地球物理。

报告摘要:

Rocks and rock-like materials may be failed due to high temperatures and inevitable dynamic loading. The understanding of damage and failure of rocks and rock-like materials subjected to thermal and dynamic loadings is thus important in many engineering applications. The failure parameters (uniaxial compressive strength (UCS), tensile strength and fracture toughness), the failure criterion and the damage evolution of rocks and rock-like materials are investigated over a wide range of loading rates at different heat-treatment temperatures. The influence of thermally induced damage on the dynamic failure parameters of rock-like materials is investigated. The formulas for describing the dependence of the dynamic failure parameters on the thermal effect and the loading rate effect are established using the damage variable.