报告内容摘要

In first part of this presentation, a new cohesive zone model is proposed to study the inertia effect of cohesive zone which has not been considered in all existing cohesive zone models. This new model predicts a terminal limiting crack speed which is comparable to the observed terminal crack speed of some ductile materials. In second part of this presentation, a strain rate-dependent cohesive zone model and related finite element model are developed to analyze speed-dependent dynamic fracture of pipeline steels observed in recent tests. The results suggested 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 ductile materials especially when the related experiments are difficult or too expensive.

报告人简介

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 3500 SCI citations (without self-citations, from “Web of Science”).

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