Evaluating MTS criterion in predicting mixed-mode crack extension under
different loading conditions
Abstract
The maximum tangential stress (MTS) criterion is one of the most widely
used criteria for predicting the direction of crack extension. The
suitability of this criterion is examined under different loading
conditions using extended finite element method (XFEM). Experimental and
numerical results reported in the literature are considered to evaluate
the validity and accuracy of the criterion. The results demonstrate that
the MTS criterion evaluated by stress intensity factors (SIF) can
accurately predict the direction of crack propagation in specimens under
direct tensile loading. This criterion overestimates the angle of crack
initiation in the specimen under indirect tensile loading, but
underestimates the angle in the specimen subjected to three-point
bending. It is concluded that the MTS criterion based on SIF could not
accurately predict the direction of the crack initiation, which could,
however, be determined properly based on the stress distribution around
the crack tip obtained by XFEM numerical models.