| 引用本文： |
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温振川,宁岁婷,张睿,高英俊.纳米级缺口起裂临界条件的晶体相场模拟[J].广西科学,2016,23(5):448-453. [点击复制]
- WEN Zhenchuan,NING Suiting,ZHANG Rui,GAO Yingjun.Phase-field-crystal Simulation of Critical Conditions for the Crack Initiation of Nanoscale Notch[J].Guangxi Sciences,2016,23(5):448-453. [点击复制]
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| 摘要: |
| [目的]研究初始缺口大小对裂纹起裂的影响。[方法]采用晶体相场(phase-field-crystal,PFC)模型研究单轴拉伸应力作用下,材料裂纹起裂的动态演化过程,并结合自由能分析裂纹起裂与扩展过程中,不同缺口尺寸对裂纹起裂的影响。[结果]沿x方向施加恒应变,初始缺口y方向尺寸较小时,改变缺口x方向尺寸,缺口并不起裂;当y方向尺寸达到一定值时,初始缺口会起裂。当y方向尺寸接近起裂临界值时,x方向尺寸的增大会延缓缺口的起裂。当x方向尺寸改变量较小时,裂纹并不起裂,当增大到x方向尺寸临界值时,缺口开始起裂并扩展。[结论]在应力大小一定的情况下,缺口起裂与应力作用方向垂直的缺口尺寸密切相关,只有与应变作用方向垂直的尺寸达到临界值,缺口才会发生起裂。 |
| 关键词: 晶体相场模型 临界缺口尺寸 缺口起裂 |
| DOI：10.13656/j.cnki.gxkx.20161121.014 |
| 投稿时间：2016-07-25 |
| 基金项目:国家自然科学基金项目(51161003,50661001),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 Critical Conditions for the Crack Initiation of Nanoscale Notch |
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WEN Zhenchuan, NING Suiting, ZHANG Rui, GAO Yingjun
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| (College of Physical Science and Technology, Guangxi University, Nanning, Guangxi, 530004, China) |
| Abstract: |
| [Objective] To study the effect of initial crack size on crack initiation.[Methods] The dynamic of process crack propagation under the uni-axial tension deformation in single crystals is simulated by the phase-field-crystal (PFC) model.The free energy is used to analyze the influence of different initial crack size on the crack initiation in the process of crack initiation and crack propagation.[Results] When the initial crack of y direction size is smaller,there is no initiation of crack under the uniaxial tension in the x axis,although the notch size in x direction changes.when the y direction size reaches a certain value,the initial cracks will expand.The time of crack initiation is delayed with the increase of x direction size.When the initial crack of x direction size changes less,there is no initiation of crack,and the initial cracks will expand when the x direction size reaches a certain value.[Conclusion] The initiation of crack is closely related to the crack size of vertical stress direction.The crack extension occurs,if only the size of notch reaches a certain value. |
| Key words: phase-field-crystal model critical notch size notch initiation |
