广西科学院学报2018，Vol.34Issue(4)：298-303,6.DOI:10.13657/j.cnki.gxkxyxb.20181204.008
纳观尺度下不同晶向取向对裂纹萌生和扩展的影响
Study on the Effect of Different Crystal Orientations on Crack Initiation and Propagation at Nano Scale
摘要
Abstract
[Objective]To understand the growth characteristics and expansion laws of cracks can help to reveal the mechanism of nano scale crack propagation and its effect on material fracture.[Methods]The crystal phase field (PFC)method is used to study the crack propagation evolution diagram, the corresponding stress distribution diagram and the stress curve diagram of different initial crystal tilt angles under uniaxial tension in the y direction.[Results]When the tensile strain reaches a critical value, the cracking mode of the sample without prestrain is different.The crack of the sample with a 5°and 20°crystal tilt angle directly cracks and is accompanied by dislocations.The crack of the sample with a 10°and 15°crystal tilt angle first emits dislocations, and the crack is ready to crack.After crack formation, the cracks of the sample with 5°and 20°crystal tilt angles mainly expand in the brittle fracture mode.The samples with 10°and 15°crystal orientation were typical ductile fracture mode.[Conclusion]Different crystal orientation angles have an important influence on crack initiation time, propagation direction and ductile-brittle expansion.关键词
微裂纹/晶向取向/裂纹萌生/裂纹扩展/晶体相场Key words
micro crack/crystal orientation/crack initiation/crack propagation/crystal phase field分类
资源环境引用本文复制引用
卢昱江,刘哲源,李依轩,黄宗吉,高英俊..纳观尺度下不同晶向取向对裂纹萌生和扩展的影响[J].广西科学院学报,2018,34(4):298-303,6.基金项目
国家自然科学基金项目(51161003)和广西自然科学重点基金项目(2018GXNSFAA138150)资助. （51161003）
