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满海,胡绪志,宁岁婷,黄礼琳,罗志荣,高英俊.晶界萌生裂纹扩展的晶体相场模拟[J].广西科学院学报,2017,33(4):246-249,260. [点击复制]
- MAN Hai,HU Xuzhi,NING Suiting,HUANG Lilin,LUO Zhirong,GAO Yingjun.Phase field crystal Simulation of Crack Nucleation and Extension from Grain Boundary[J].Journal of Guangxi Academy of Sciences,2017,33(4):246-249,260. [点击复制]
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| 晶界萌生裂纹扩展的晶体相场模拟 |
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满海1, 胡绪志1, 宁岁婷1, 黄礼琳1,2, 罗志荣2, 高英俊1
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| (1.广西大学物理科学与工程技术学院, 广西高校新能源重点实验室, 广西南宁 530004;2.玉林师范学院物理科学与工程技术学院, 广西玉林 537000) |
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| 摘要: |
| [目的]研究双晶样品在单轴拉伸应变作用下所发生的纳米微观尺度裂纹扩展运动,观察裂纹扩展特征,揭示位错对裂纹扩展的作用规律。[方法]应用晶体相场(PFC)方法模拟裂纹扩展演化及其位错运动。[结果]在位错没有发射之时,裂纹沿位错对柏氏矢量方向解理扩展,发射位错后裂尖沿顺时针旋转60°继续扩展。[结论]晶界滑移出的位错由于周围应力集中,萌生出微裂纹。在裂纹扩展中,裂纹与位错相互作用,可以有多种形式。 |
| 关键词: 位错运动 裂纹扩展 晶体相场 |
| DOI：10.13657/j.cnki.gxkxyxb.20171129.001 |
| 投稿时间：2017-05-10 |
| 基金项目:国家自然科学基金项目(51161003,51561031),广西自然科学基金重点项目(2012GXNSFDA053001)和广西大学大创项目(201610593220,201610593218)资助。 |
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| Phase field crystal Simulation of Crack Nucleation and Extension from Grain Boundary |
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MAN Hai1, HU Xuzhi1, NING Suiting1, HUANG Lilin1,2, LUO Zhirong2, GAO Yingjun1
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| (1.Guangxi Key Laboratory of Novel Energy Materials of College and University, College of Physics Science and Engineering, Guangxi University, Nanning, Guangxi, 530004, China;2.Institute of Physics Science and Engineering Technology, Yulin Normal University, Yulin, Guangxi, 537000, China) |
| Abstract: |
| [Objective] The crack propagation movement of nano crystalline microscopic scale under the uniaxial tensile strain is investigated,and the characteristics of crack propagation are observed to reveal the mechanism of dislocation on the crack propagation.[Methods] The phase field crystal (PFC) method is used to simulate the evolution of crack propagation and dislocation motion.[Results] When the dislocations are not emitted,the crack cleaves along the direction of Burgers vector along the dislocations.After the dislocations are cracked,the crack tip continues to rotate clockwise by 60°.[Conclusion] Dislocations that slip out of the grain boundaries initiate micro-cracks due to the stress concentration around them.There are four modes of interaction between cracks and dislocations during the crack propagation. |
| Key words: dislocation motion crack propagation phase field crystal |
