Analysis of meso-scale damage and crack for CuW alloys induced by thermal shock

详细信息    查看全文

• 作者：Yanlong Wang^a ; Shuhua Liang^a ; ^{liangxaut@yahoo.cn} ; Jianting Ren^b
• 关键词：CuW alloys ; Meso-scale ; Finite element method ; GTN model ; Crack
• 刊名：Materials Science and Engineering: A
• 出版年：2012
• 出版时间：1 February 2012
• 年：2012
• 卷：534
• 期：Complete
• 页码：542-546
• 全文大小：1438 K

文摘

Considering the mismatch of coefficient of thermal expansion (CTE) of Cu and W phase and temperature gradient, internal and external thermal load are applied on meso-scale 2D representative volume element (RVE) of CuW alloys under thermal shock, respectively. Void volume fraction (VVF) and VVF induced crack are determined by finite element method (FEM) utilizing Gurson-Tvergaard-Needleman (GTN) model, and the driving forces for damage nucleation and growth are analyzed with normal and shear stress as well. The simulation results show that damage and damage induced crack initiate from the vertex of W grain and grow along W/Cu interface, then propagate into Cu phase. After thermal shock experiment on CuW specimen by high voltage arc, micro cracks present along W/Cu interfaces and inside Cu phase, which is in good agreement with simulation results.