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Three-Orthogonal-Direction Stress Mapping around a Fatigue-Crack Tip Using Neutron Diffraction
Authors:E-Wen Huang  Soo Yeol Lee  Wanchuck Woo  Kuan-Wei Lee
Affiliation:1. Department of Chemical and Materials Engineering and Center for Neutron Beam Applications, National Central University, Jhongli City, 32001, Taiwan, ROC
2. Department of Materials Engineering, The University of British Columbia, Vancouver, BC, V6T 1Z4, Canada
3. Canadian Neutron Beam Centre, National Research Council Canada, Chalk River, ON, K0J 1J0, Canada
4. Neutron Science Division, Korea Atomic Energy Research Institute, Daejeon, 305-353, South Korea
Abstract:Quantitative determination of the stress fields around the crack tip is a challenging and important subject to understand the fatigue crack-growth mechanism. In the current study, we measured the distribution of residual stresses and the evolution of the stress fields around a fatigue crack tip subjected to the constant-amplitude cyclic loading in a 304L stainless steel compact-tension (CT) specimen. The three orthogonal stress components (i.e., crack growth, crack opening, and through thickness) of the CT specimen were determined as a function of distance from the crack tip with 1-mm spatial resolution along the crack-propagation direction. In-situ neutron-diffraction results show that the enlarged tensile stresses were developed during loading along the through-thickness direction at a localized volume close to the crack tip, resulting in the lattice expansion in all three orthogonal directions during P max. The current study suggests that the atypical plane strainlike behavior observed at the midthickness position might be the reason for the mechanism of the faster crack-growth rate inside the interior than that near the surface.
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