This paper presents the simple method to determine the complex stress intensity factor of interface crack problem by the finite element method. The proportional method is extended to the interface crack problem. In the present method, the stress values at the crack tip calculated by FEM are used and the stress intensity factors of interface crack are evaluated from the ratio of stress values be...

A unified approach based on convex optimization is proposed for finding equilibrium configurations of structures consisting of no-tension or no-compression isotropic material in small strain and deformation. The semidefinite programming (SDP) problem is formulated so as to give the same optimizer as that of the minimization problem of total potential energy. An equilibrium configuration is obta...