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动态裂纹扩展中的裂纹滞留现象

CRACK TRAPPING PHENOMENA IN DYNAMIC CRACK PROPAGATION

  • 摘要: 借助于J.R.Wilis等(1995)的动态权函数和Rice等(1994)的模拟方法,本文研究了裂纹前方开始环绕和穿透介质中各种粗糙微粒而形成粗糙的裂纹表面等非稳定现象.数值结果表明:在Ⅰ型情形,振荡性裂纹前缘运动源于应力强度波的建设性—破坏性相互作用.这些波包括膨胀波、剪切波和瑞利波系,彼此相互干涉且与裂纹运动边界相互作用,导致了裂纹前方扩展路径和扩展速度的连续波动.

     

    Abstract: Using the mode I weight function of Willis et al. (1995)for a moving crack in combination with the model method of Rice et al. the instabilityphenomena of the crack front, how does it begin to surround andpenetratevarious arrays of asperities are investigated. The numerical results showthat the oscillatory crack tip motion through brittle, locallyheterogeneous materials results from constructive destructiveinterference of stress waves that can lead to continuing fluctuation of the crack front and propagat...

     

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