Determination of crack tip parameters for ASCB specimen under mixed mode loading using finite element method

In this paper, a new asymmetric semicircular bend specimen (ASCB) is presented. Having more geometric parameters in asymmetric bend elements gives the opportunity of covering a wider range of KІ, KІІ and T-stress in comparison with classical SCB specimens. Finite element method is used to obtain these parameters from pure mode I to pure mode II. Extensive numerical calculations are made to get a wide range data for crack tip parameters of this specimen. It is observed that for ASCB specimens with specified geometries under pure mode II loading, one of the bottom supports can move horizontally without significant variation in YI. The complete sets of numerical results are obtained and can be used for verification and interpretation of future experimental results.

Research highlightsCrack tip parameters for ASCB specimen are obtained for various conditions. ASCB specimen can provide both negative and positive T-stress. ASCB specimen is able to provide wider range of mode mixities. Suitable boundary conditions for providing pure mode II are found.