国际应用力学中心邀请,新加坡国立大学助理教授Leong Hien Poh(傅勇宪)来访我院并作学术报告
报告时间:2019年1月8日
报告地点:航天航空学院第二会议室10:30
报告题目:A localizing gradient damage model for the fracture of materials
报告人简介
Leong Hien Poh(傅勇宪)新加坡国立大学土木与环境工程系助理教授,2011年获得新加坡国立大学与埃因霍芬理工大学双博士学位。致力于材料力学、损伤力学、高阶连续介质、多尺度方法和均匀化方法的研究。2016-2017年获得新加坡国立大学工程学院教学荣誉奖;2015-2016年获得新加坡国立大学年度教学优秀奖与新加坡国立大学工程学院教学荣誉奖;2013-2014年获得新加坡国立大学工程学院教学优秀奖; 2004年获得新加坡工程师学会金质奖章。2017年担任ASCE EMI计算力学委员会委员,以及ASCE电磁干扰建模非弹性和多尺度行为委员会担任;2012年成为新加坡计算力学协会会员。2016年新加坡国立大学硕士(土木)项目经理。在力学领域旗舰期刊Journal of the Mechanics and Physics of Solids(6篇) 、International Journal of Solids and Structures(3篇) 、International Journal of Impact Engineering(1篇)及其他国际知名期刊上共发表论文31篇。Computational Materials Science v94 2013年特约编辑;
报告内容:
Standard continuum models are mesh sensitive during strain softening. To this end, the nonlocal integral or gradient enhancement is commonly adopted to regularize the numerical results. With the ‘conventional’ nonlocal enhancement, whereas the structural response is made mesh independent, a spurious damage growth phenomenon is observed. Consequently, the development of a macroscopic crack cannot be well represented. In this presentation, a micromechanical analysis is first carried out to study the nature of interactions between microcracks, and their propagation onto the macro scale. Based on this understanding, the micromorphic framework is adopted to formulate a localizing nonlocal gradient enhancement, where the interaction domain decreases with damage. It is shown that the localizing gradient enhancement regularizes the softening response with sharp damage profiles. Good performance in quasi-static and dynamic fracture of materials will be demonstrated.