Stress Intensity Factors and T-Stress Solutions for 3D Asymmetric Four-Point Shear Specimens

In this paper, extensive three-dimensional finite element analysis is conducted to study an asymmetric four-point shear (AFPS) specimen: a widely used mixed-mode I/II fracture test specimen. Complete solutions of mechanics parameters KI, KII, KIII, T11, and T33 have been obtained for wide range a/W t/W geometry combinations. It demonstrated that the thickness specimen has significant effect on variation parameter values. Their effects crack tip plastic zone are also investigated. The results presented here will be very useful toughness testing materials under loading conditions.