文献类型：期刊文献

英文题名：Thermo-elasto-plastic phase-field modelling of mechanical behaviours of sintered nano-silver with randomly distributed micro-pores

作者：Su, Yutai[1,2];Fu, Guicui[2];Liu, Changqing[1];Zhang, Kun[1,4];Zhao, Liguo[1];Liu, Canyu[1];Liu, Allan[1];Song, Jianan[1,3]

机构：[1]Loughborough Univ, Wolfson Sch Mech Elect & Mfg Engn, Loughborough LE11 3TU, Leics, England;[2]Beihang Univ, Sch Reliabil & Syst Engn, Beijing 100191, Peoples R China;[3]Beihang Univ, Sch Energy & Power Engn, Beijing 100191, Peoples R China;[4]East China Univ Sci & Technol, Sch Mech & Power Engn, MOE Key Lab Pressure Syst & Safety, Shanghai 200237, Peoples R China

年份：2021

卷号：378

外文期刊名：COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING

收录：;EI(收录号：20210910017344);WOS:【SCI-EXPANDED(收录号:WOS:000659480300001)】；

基金：The authors acknowledge the funding supports provided by the China Scholarship Council (CSC) (Reference No. 201906020125), and the EPSRC research grants (UK): (i) Underpinning Power Electronics 2017 - Heterogeneous Integration (HI) project (Grant No. EP/R004501/1), and (ii) Quasi-ambient bonding to enable cost-effective high temperature Pb-free solder interconnects (QAB) project (Grant No. EP/R032203/1). The authors thank Dr Stuart Robertson and Dr Zhaoxia Zhou of Loughborough University for their thoughtful discussions and suggestions in this study.

语种：英文

外文关键词：Phase field model; Thermo-elasto-plastic behaviour; Sintered nano-silver; Random micro-porous structure

摘要：Nano-silver paste is an emerging lead-free bonding material in power electronics, and has excellent mechanical properties, thermal conductivity and long-term reliability. However, it is extremely challenging to model the mechanical and failure behaviours of sintered nano-silver paste due to its random micro-porous structures and the coupled thermomechanical loading conditions. In this study, a novel computational framework was proposed to generate the random micro-porous structures and simulate their effects on mechanical properties and fracture behaviour based on the one-cut gaussian random field model and the thermo-elasto-plastic phase-field model. The elastic modulus, ultimate tensile strength and strain to failure are computed statistically, showing good agreement with the experimental results. Further, the framework was applied to model the fracture of sintered nano-silver paste under thermal cyclic conditions, demonstrating the formation of distinctive crack patterns and complex crack networks. The cracking behaviours observed in the experiments and simulations are remarkably similar to each other. The framework was implemented within Abaqus via a combination of subroutines and Python scripts, automating the process of model generation and subsequent computation. This study provides an efficient and reliable approach to simulate the mechanical and failure behaviours of sintered nano-silver paste with random micro-porous structures. (C) 2021 Elsevier B.V. All rights reserved.