【摘要】 假设剪切模量和密度沿厚度方向连续且为指数形式模型,研究了含有限长裂纹的无限长条功能梯度材料在反平面剪应力荷载作用下的运动裂纹问题。利用非局部线弹性理论和Fourier积分变换方法,将混合边界值问题简化为对偶积分方程,最后通过Schmidt方法对裂纹尖端的应力场和位移场进行了求解。与经典理论的解答不同,裂纹尖端应力为有限值,其最大值随长条高度和裂纹的运动速度的增加而增加。更多还原

【Abstract】 It is assumed that the shear moduli and mass density vary continuously in the thickness direction and is to be of exponential form.The study involves the moving crack problem in an infinite strip of FGM between free boundary subjected to an anti-plane shear loading in an infinite strip of functionally graded material(FGM).The mixed boundary value problem is reduced to a dual integral equation by means of nonlocal linear elasticity theory and Fourier integral transform method.The stress field and displacement field for an infinite strip of FGM are solved near the tip of a crack by using Schmidt’s method.Unlike the classical elasticity solution,the magnitude of stress at the crack tip is finite,and it is found that the maximum stress at the crack tip increase as the strip length and crack moving speed are increased.更多还原