A method is presented for calculating the failure strengths and failure modes of composite structures containing a mechanically fastened hole for materials exhibiting nonlinear elastic behavior. The effects of fastener elasticity, clearance and friction on the stresses around the hole edge are considered. An efficient numerical procedure is developed for the solution of the two-dimensional contact problems with Coulmb friction between the fastener and the hole based on a complementarity problem formulation. The nonlinear analysis is composed of the combination of Lagrangian formulation of the contact problem, the nonlinear shear stress-shear strain relation in each ply and the nonlinear failure criterion. Numerical results are compared to experimental data and linear analysis results. These comparisons show that the present analysis provides the failure strengths and failure modes more accurately than the previous method employing a linear analysis.
展开▼
