A simple estimation method of stress intensity factors for through-cracks in angle-ply laminates

In the present paper a simple method of estimation of stress intensity factors for through-cracks in angle-ply laminates is developed. In this procedure, Savin's elasticity solution for an elliptical hole in two-dimensional infinite plate is used as a basic solution for the stress distribution in each ply of laminate. The present method is applied to the problems of through cracks in a $\text{(}\text{0°}\text{90}\text{)}$_s laminate and a $\text{(}\text{?45°}\text{+ 45°}\text{)}$_s laminate. Comparison with existing numerical solutions obtained by three-dimensional finite element analysis shows good agreement. The simplicity of the present method gives the design engineer a useful tool for estimating stress concentration due to the presence of a hole or a crack.