ANALYTICAL-GENERALIZED VARIATIONAL METHOD OF SOLUTION FOR DELAMINATION OF LAMINATES IN PLANE WARPING

In this paper,the delamination solution of the angularly and symmetrically stacked composite laminates is given for the plane warping condition.First of all,the eigen function expansions of stress and displacement.fields are derived,for which all of the basic equations,boundary conditions on crack surfaces and conditions of continuities between different plies are satisfied.Furthermore,the govcring parameters of the singular stress fields as the coefficient of singular terms in the above expansions are determined by the generalized variational principle for multi-regions,to satisfy the boundary conditions.,excluding those along the craclt surfaces.There are only line integrals in the variational equations duc to the previous satisfactions of all basic equations.The computations show that this method of solution has the advantages of simple preparation,rapid convergerrcy aid time-saving.