Investigation Of Constraint Effect And Fracture Mode For Mixed Mode Inclination Surface Crack In Infinite Plate Under Compression

Abstract

The stress field, constraint effect and fracture mode transition at crack tip of mixed mode I-II-III inclination surface crack under compression have been investigated. The effects of geometrical configurations (relative crack depth and aspect ratio), friction coefficient and biaxial scale factor on stress intensity factor (KII and KIII) and in-plane constraint parameter T-stress are quantitatively studied, the stress field at different crack inclination angles under tension and compression are compared, and the failure mode at special locations along crack front of inclination surface crack are analyzed according to the generalized maximum tangential stress criterion(GMTS). The relative crack depth has slight effect on stress intensity factor and T-stress, and aspect ratio has significant effect on stress intensity factor and T-stress. The friction coefficient decreases the magnitude of stress intensity factor and increases the magnitude of T-stress, the greater the crack inclination angle is, the more pronounced the effect is when crack inclination angle greater than 30°. The stress distribution around crack tip under tension and compression is completely different. At free surface, the crack will failure in-plane shear mode II sliding crack, and at the deepest part of crack, the crack will start as an out-plane shear mode III tearing crack under compression.