纳观尺度裂纹扩展微观机理的晶体相场法研究

计算物理 ›› 2017, Vol. 34 ›› Issue (4): 453-460.

纳观尺度裂纹扩展微观机理的晶体相场法研究

高英俊¹, 杨瑞琳¹, 黄礼琳^1,2, 刘瑶¹

1. 广西大学物理科学与工程技术学院, 广西高校新能源材料及相关技术重点实验室, 南宁 530004;
2. 玉林师范学院物理科学与工程技术学院, 玉林 537000

收稿日期:2016-04-22 修回日期:2016-06-12 出版日期:2017-07-25 发布日期:2017-07-25
作者简介:高英俊(1962-),男,教授,博士生导师,主要从事材料微结构计算模拟实验研究,E-mail:gaoyj3239478@163.com
基金资助:
国家自然科学基金（51161003和50661001）及广西自然科学基金重点项目（2012GXNSFDA053001）资助

Phase Field Crystal Simulation in Nano-scale for Crack Extension with Pre-deformation

GAO Yingjun¹, YANG Ruilin¹, HUANG Lilin^1,2, LIU Yao¹

1. Guangxi Colleges and Universities Key Laboratory of Novel Energy Materials, College of Physics Science and Engineering, Guangxi University, Nanning 530004, China;
2. Institute of Physics Science and Engineering Technology, Yulin Normal University, Yulin 537000, China

Received:2016-04-22 Revised:2016-06-12 Online:2017-07-25 Published:2017-07-25

摘要/Abstract

摘要： 采用晶体相场方法模拟不同预变形量的样品在单轴拉应变作用下的纳观裂纹扩展行为.观察纳观尺度的裂纹演化过程，结果表明：对于无预变形的样品，在拉应变作用下，由于裂口处应变集中，当应变量达到临界值时，裂口开始起裂并伴随位错出现，随着裂尖的前进位错伴随着裂尖而滑移.对于预变形的样品，在较小的临界应变值裂口起裂，且预变形量越大，裂纹越易起裂和扩展.在裂纹扩展早期阶段呈现出扩展-转向-扩展的长大特征，其本质是裂纹扩展由于裂尖附近的位错滑移受阻引起应变集中，造成主次原子晶面方向的原子键交替断裂，使得裂尖扩展沿[√3,1]和[√3,-1]方向交替改变而前进，裂纹边缘呈锯齿形状.样品的裂纹扩展后期出现显著的类似解理裂纹扩展行为，解理方向沿[√3,1]和[√3,-1]方向，且预变形量大的样品裂纹解理扩展更明显且扩展较快.

关键词: 微裂纹, 预变形, 晶体相场, 模拟实验

Abstract: Crack propagation under tensile strain in samples with pre-deformation is simulated using phase field crystal(PFC) method. It shows that crack of sample without pre-deformation, under tensile strain, begins to crack due to strain concentration as strain reaches a critical value. For pre-deformed samples, crack starts to propagate at a less critical strain value, and the larger the pre-deformation, the faster and more obvious the crack growth. For samples with pre-deformation during early process of crack propagation, growth characteristics of expansion-turning direction-expansion are presented. The essence is that crack growth is extended by atomic bond alternative fracture in directions[√3,1] and[√3,-1] of primary and secondary atomic arrangement direction, which leads to zigzag edge of the crack. For samples with pre-deformation at later stage crack propagation present longer cleavage crack extension in directions along[√3,1] and[√3,-1]. And the larger the pre-deformation of sample, the quicker the expansion of cleavage crack.

Key words: micro crack, pre-deformation, phase field crystal, simulation experiment

中图分类号:

TG111

高英俊, 杨瑞琳, 黄礼琳, 刘瑶. 纳观尺度裂纹扩展微观机理的晶体相场法研究[J]. 计算物理, 2017, 34(4): 453-460.

GAO Yingjun, YANG Ruilin, HUANG Lilin, LIU Yao. Phase Field Crystal Simulation in Nano-scale for Crack Extension with Pre-deformation[J]. CHINESE JOURNAL OF COMPUTATIONAL PHYSICS, 2017, 34(4): 453-460.

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