正交各向异性功能梯度材料Ⅲ型裂纹尖端动态应力场

基金项目: 国家自然科学基金资助项目(19772029);国家自然科学基金资助重大项目(19891180)

Dynamic Stress Field Around the Mode Ⅲ Crack Tip in an Orthotropic Functionally Graded Material

1.
Department of Architectural Engineering, Shijiazhuang Railway Institute, Shijiazhuang 050043, P R China;
2.
Department of Communication Engineering, Shijiazhuang Railway Institute, Shijiazhuang 050043, P R China;
3.
LNM, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100080, P R China

摘要: 研究了无限大正交各向异性功能梯度材料Griffith裂纹受反平面剪切冲击作用的问题.材料两个方向的剪切模量假定为成比例按特定梯度变化.通过采用积分变换-对偶积分方程方法,获得了裂纹尖端动态应力场.动态应力强度因子计算结果显示:增加剪切模量梯度或增加垂直于裂纹面方向的剪切模量可以抑制动态应力强度因子的幅值.
- 各向异性材料 /
- 功能梯度材料 /
- 动态应力强度因子 /
- 裂纹 /
- 冲击
Abstract: The problem of a Griffith crack in an unbounded orthotr opic functionally graded material subjected to antiplane shear impact was studied.The shear moduli in two directions of the functionally graded material were assumed to vary proportionately as definite gradient.By using integral transforms and dualimtegral equations,the local dynamic stress field was obtained.The results of dynamic stress intensity factor show that increasing shear moduli's gradient of FGM or increasing the shear modulus in direction perpendicular to crack surface can restrain the magnitude of dynamic stress intensity factor.
- aniso tropic media /
- functionally graded materials /
- dynamic stress intensity factor /
- crack /
- impact

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