报告题目：Modified cohesive zone models for high speed dynamic fracture of ductile materials

报告人:                Dr. Chongqing RU

Professor, Department of Mechanical Engineering

University of Alberta, Edmonton, Canada T6G 2G8

时间：2014年10月10日(周五)   9:00                    

地点：中国科学院力学研究所主楼344会议室

报告摘要：

In this presentation, a new cohesive zone model is proposed to study the inertia effect of cohesive zone which has not been considered in existing cohesive zone models. This new model predicts a terminal limiting crack speed comparable to the observed terminal crack speed of some ductile materials. On the other hand, a strain rate-dependent cohesive zone model and related finite element model (FEM) are developed to analyze speed-dependent dynamic fracture of pipeline steels observed in recent tests. The FEM results showed that the strain rate-effects could be largely responsible for the observed speed-dependent dynamic fracture phenomena of pipeline steels. The presented theoretical and numerical models can be used to simulate high speed fracture of pipeline steels especially when the related experiments are difficult or too expensive.

报告人简介：

Dr. Ru is currently a Professor in department of mechanical engineering, University of Alberta, Canada. Dr. Ru received his doctorate in solid mechanics at Peking University (China), and then worked in the Institute of Mechanics, Chinese Academy of Science and held a number of visitor/research positions in several universities in Italy, USA and Canada. He joined the University of Alberta in 1997 and became a Professor in 2004. Dr. Ru’s past research areas include plastic buckling of structures, mechanics of elastic inclusions, electroelastic mechanics, and some applied mathematics problems related to solid mechanics. Besides traditional areas of solid mechanics, his recent research interests include solid mechanics at micro/nano scales, cell biomechanics, and dynamic ductile fracture. Dr. Ru’s publications received more than 3600 SCI citations (without self-citations, from “Web of Science”).

Email : cru@ualberta.ca

报告联系人：沈楠  (office@lnm.imech.ac.cn 82543935)