The effect of T-stress on crack-tip plastic zones under mixed-mode loading conditions
In this paper, the influence of T-stress on crack-tip plastic zones under mixed-mode I and II loading conditions is examined. The crack-tip stress field is defined in terms of the mixed-mode stress intensity factors and the T-stress using William's series expansion. The crack-tip stress field is incorporated into the Von Mises yield criteria to develop an expression that determines the crack-tip plastic zone. Using the resultant expression, the plastic zone is plotted for various combinations of mode II to mode I stress intensity factor ratios and levels of T-stress. The properties of the plastic zone affected by T-stress and mixed-mode phase angle are discussed. The observations obtained on plastic zones variations are important for further fatigue and fracture analyses for defects in engineering structures under mixed-mode loading conditions.
|Keywords||constraint effect, mixed-mode loading, plastic zone, T-stress|
|Journal||Fatigue and Fracture of Engineering Materials and Structures|
Nazarali, Q., & Wang, X. (2011). The effect of T-stress on crack-tip plastic zones under mixed-mode loading conditions. Fatigue and Fracture of Engineering Materials and Structures, 34(10), 792–803. doi:10.1111/j.1460-2695.2011.01573.x