Abstract
A combined Moiré-Sagnac interferometry method is developed for in-plane (u andv) and out-of-plane (w) surface deformation measurement. The combined optical setup is used to measure three-dimensional crack tip deformations of AI 2024-0 and AI 2024-T4 specimens at room temperature and an inconel 909 specimen at 570°C. Measured displacements near the crack tip region of the AI 2024-T4 specimen are used as input nodal displacements to determine stress intensity factors based on two-dimensional and three-dimensional Jacobian derivative method. The values compare favorably with theoretical calculations. The extent of the three-dimensional crack tip deformation zone is also discussed.
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Kang, B.SJ., Anderson, S.M. Three-dimensional crack tip deformation measurement using combined Moiré-Sagnac interferometry. Experimental Mechanics 41, 84–91 (2001). https://doi.org/10.1007/BF02323109
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DOI: https://doi.org/10.1007/BF02323109