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Abstract
The effects of anisotropy during mixed mode fatigue crack growth were studied in single crystal 316L stainless steel. An anisotropic least-squares regression algorithm using displacements from digital image correlation was developed to find the effective stress intensity factors, KI and KII, and the T-stress. Crack tip plastic zones were determined using an anisotropic yield criterion. Strains in the plastic zone obtained from digital image correlation showed a dependence on the crystallography and load ratio. Crack tip slip irreversibility was measured and showed an increasing trend with increasing crack length; this information is critical for describing crack growth behavior.
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