Abstract
The minimum plastic zone radius (MPZR) criterion is one of the recent criterions to estimate crack initiation direction under mixed mode loading. The MPZR theory is based on the theoretical computations of plastic zone size (PZS). In this investigation, the shape and size of crack-tip plastic zones have been estimated by analytical and the elastic finite element computations in a Compact Tensile Shear (CTS) specimen under mixed mode (I/II) loading according to von Mises yield criteria. The theoretical and the finite element analysis results are compared to analyze the minimum plastic zone radius (MPZR) criterion for crack-initiation angle with reference to the loading angle and stress intensity factor.
Highlights
P rediction of crack initiation and orientation with its propagation path under mixed-mode loading is desirable for life prediction of engineering materials [1,2,3]
minimum plastic zone radius (MPZR) theory states that the crack initiates in the direction where the radius of plastic zone takes either a local or global minimum depending on the loading direction
D ifferent load steps were applied to the specimen to estimate the stress intensity factor and to study the plastic zone shape and size ahead of the crack-tip
Summary
P rediction of crack initiation and orientation with its propagation path under mixed-mode loading is desirable for life prediction of engineering materials [1,2,3]. Sharanaprabhu and Kudari [10] have studied size and shape of plastic zone under mixed mode loading condition using finite element analysis.
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