复合材料层合板三维分层问题的断裂力学分析

对复合材料层板中椭圆分层的断裂力学问题进行了研究。根据层板平面剪切型分层和反平面剪切型分层尖端附近位移场、应力场与应力强度因子的关系,利用法向切片法,得到椭圆分层前缘应力强度因子与能量释放率的关系。结合由附加位移所确定的总位能,确定了能量释放率和应力强度因子沿分层前缘分布的表达形式。数值计算给出了二者随分层区形状、载荷以及各层厚度比等参数变化的分布情况。

ANALYSIS OF FRACTURE MECHANICS ON DELAMINATION IN COMPOSITE LAMINATE

The fracture mechanics feature of elliptical delaminations in a composite laminate is studied. Using the method of normal slices, the relationship between stress intensity factors and energy release rate was established, based on the stress and displacement fields in the vicinity of the delamination tip of a plane shear delamination and anti plane shear delamination in a composite laminate. The distribution expression of the energy release rate along the front of the elliptical delamination area was obtained, combining with the total potential energy determined by the additional displacements. Computational results show the distribution of energy release rate and stress intensity factors with respect to the shape of delamination, load and thickness ratio of the laminate.