东北大学学报（自然科学版）

东北大学学报(自然科学版) ›› 2004, Vol. 25 ›› Issue (2): 167-170.DOI: -

• 论著 • 上一篇    下一篇

裂纹连续度对非均质材料中雁行裂纹扩展的影响

徐涛;唐春安;王善勇;赵兴东   

  1. 东北大学资源与土木学院;东北大学资源与土木学院;东北大学资源与土木学院;东北大学资源与土木学院 辽宁沈阳　110004
  • 收稿日期:2013-06-24 修回日期:2013-06-24 出版日期:2004-02-15 发布日期:2013-06-24
  • 通讯作者: Xu, T.
  • 作者简介:-
  • 基金资助:
    国家自然科学基金资助项目(50174013,50134040,50204003)

Influence of crack continuity on propagation of en echelon cracks in heterogeneous materials

Xu, Tao (1); Tang, Chun-An (1); Wang, Shan-Yong (1); Zhao, Xing-Dong (1)   

  1. (1) Sch. of Resources and Civil Eng., Northeastern Univ., Shenyang 110004, China
  • Received:2013-06-24 Revised:2013-06-24 Online:2004-02-15 Published:2013-06-24
  • Contact: Xu, T.
  • About author:-
  • Supported by:
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摘要： 应用材料破裂过程分析(MFPA2D)系统,通过对非均质材料试样中预置的雁行裂纹在单轴压缩下裂纹扩展、演化过程的数值模拟,研究了裂纹连续度的变化对裂纹尖端邻域应力场及裂纹扩展模式的影响,同时分析了连续度变化对裂纹起裂应力及强度所造成的影响·数值模拟结果表明随裂纹连续度的减小,裂纹内尖端的应力场逐渐由拉应力场过渡为压应力场,裂纹的扩展模式相应地经历拉模式(T)、拉剪模式(T S)及压模式(C),裂纹扩展的起始角度与最大压应力之间的角度也逐渐增大·此外,数值模拟结果还表明裂纹尖端的起裂应力大致为试样极限强度的1/2～1/3·

关键词: 裂纹连续度, 雁行裂纹, 非均匀介质, 单轴压缩, 裂纹扩展, 数值模拟

Abstract: Using a Material Failure Process Analysis (MFPA2D) code, the influence of crack continuity in heterogeneous materials containing two existing parallel flaws under uniaxial loading is numerically studied. The numerical simulation reproduces the stress field in the vicinity of cracks and the processes of propagation and coalescence of cracks during compression. The numerical simulation results showed that, with the decrease of the crack continuity, the stress field between the tips of internal cracks gradually changes from tensile stress to compression stress and the propagation mode of cracks also changes from tensile mode(T), tensile-shear mode(T-S) to compressive mode(C), and the initiation angle between the flaw and the direction of the maximum compression increases gradually as well. In addition, the initiation stress on the tips of cracks is about l/2-1/3 of the failure strength of the specimens.

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