Abstract
Crack tip deformation fields in an aluminum single crystal are quantitatively obtained by applying three-dimensional moire interferometry technique. Tensile specimen made of aluminum single crystal has an edge crack on (223) plane with its tip along [10,7,2] direction. Specimen with this specific orientation undergoes power-law hardening with hardening index n being 3.1. The experimental arrangement for moire interferometry results in a displacement sensitivity of 0.47 μm/fringe. Displacement fields at the free surface near the crack tip are mapped with moire fringe patterns. Both effective strain and maximum shear strain within a small region of less than 2 mm from the crack tip have been evaluated. In partial agreement with earlier analytical and numerical solutions, the results of this experiment show that the deformation fields near the crack tip are divided into several different angular sectors, and concentrated shears are found at these sector boundaries where displacements are continuous. The experimental results also show that the effective strain and maximum shear strain remain constant (independent of angle θ) within certain angular sectors.
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