Effect of Crack Length to Plate Width Ratio on Stress Intensity Distribution at the Crack Tip

Abstract

To start the comprehending of the materials fracture, first must understand the stress fields and deformation distribution at the crack tips. Analysis the behavior of crack for a solid plate may be extensive importance of the plate design to evade the failure. The crack is small when rivalled to the dimension of solid plate and the smallest crack ligament to the exterior plate region is greatly than the crack can be estimated for an infinite plate with finite crack. The variant of the stress field and stress intensity distribution is not great in profile compared with the variation in values. The result evaluated using finite element method to analysis by using Ansys Parametric Design Language (APDL) code in Ansys v.11 with static analysis at two different cases for carbon steel material alloy. In the first case, tension load applied at the upper edge of the plate model and in the second case, shear load applied at the upper edge. The results extracted from the current study show increasing the crack length to width ratio (a/b) from 0.1 to 0.9, increases the Von Misses stress and stress intensity values especially at the crack tip. The Von Misses stress increasing to 369 MPa while the increasing to 1650 MPa in the first case which represent the maximum values from two cases. The extracted results appear that the elastic stress intensity under static load is above the yield strength of the two cases load take into account in the current study.

Keywords: Crack length, Crack tip, Stress Intensity, Tension Load, Shear Load.