Mode III crack tip fields in couple stress elastic materials with two characteristic lengths

摘要: The asymptotic fields near the tip of a stationary crack in strain gradient elastic material under Mode III loading conditions are investigated by adopting indeterminate theory couple stress elasticity with two characteristic lengths. adopted constitutive model is able to account for underlying microstructure as well strong size effects arising at small scales. on mainly consist substantial increase singularities skew-symmetric and thus resulting significant tractions level ahead crack-tip. Correspondingly, symmetric field turns out be nonsingular. These results agree findings analysis performed single length. However, angular variations energy release rate turn strongly influenced ratio between