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Plane strain elastic-plastic finite element analyses are used to study the stress,strain fieldsaround a straight crack in power hardening plastic material.Center crack panel (CCP),single edge crackpanel (SECP) and double edge crack panel (DECP) tension specimens are analyzed with various cracklengths.Two local constraint parameters,i.e.in-plane stress ratio T_x and out-of-plane constraint T_x are an-alyzed,which are defined as tangential stress dividing normal (open) stress and out-of-plane stress dividingthe sum of tangential stress and nonnal stress respectively.Numerical analyses indicate that the two localconstraint parameters are nearly independent of the specimen geometry and the loading level in the plasticzone.Methods of estimating two constraint parameters and ways to define the boundary of the blunt zone aregiven.By using these parameters,the stress distributions in the plastic:zone,especially in the blunt zone canbe accurately predicted.
Plane strain elastic-plastic finite element analyzes are used to study the stress, strain fields of a straight crack in power hardening plastic material. Center crack panel (CCP), single edge crackpanel (SECP) and double edge crack panel (DECP) Tlx and out-of-plane constraints T_x are an-alyzed, which are defined as tangential stress dividing normal (open) stress and out-of-plane stress dividingthe sum of tangential stress and nonnal stress respectively. Numerical analysis of that two localconstraint parameters are nearly independent of the specimen geometry and the loading level in the plastic zone. Methods of estimating two constraint parameters and ways to define the boundary of the blunt zone aregiven. By using these parameters, the stress distributions in the plastic: zone, especially in the blunt zone canbe precisely predicted.