Upper Bound Solution for Weld Anisotropic Cracked Plates InBending

摘要

Metallic sheets after forming processes such as rolling are usually anisotropic (orthotropic), and the anisotropy of plasticproperties may have a significant effect of the limit load.For several typical cracked specimens, it has been demonstrated in [1– 3].In all of these papers, welded overmatched specimens have been considered assuming that the base material isorthotropic and the weld material is isotropic.Also, the kinematically admissible velocity fields assumed consisted of velocitydiscontinuity lines with no plastic zone of finite size.In particular, an upper bound solution for welded cracked specimensubject to pure bending has been obtained in [3].That solution generalizes the solution for isotropic specimen proposed in [4].The present solution improves the solution given in [3].