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In this paper we examined the influence of T-stress on crack tip plastic zones under mixed mode I and mode II loading conditions. The crack-tip stress field is defined in terms of the mixed mode stress intensity factors (SIFs) and the T-stress using the William’s series expansion. The crack-tip stress field is incorporated into the Von Mises yield criteria to develop an expression that models the crack-tip plastic zone. Using the obtained plastic zone expression, the plastic zone is mapped and analyzed for various combinations of mode II to mode I SIF ratios and T-stress. The properties of plastic zone affected by T-stress are discussed.