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Page count: 22

A study of stress wave propagation around localized crack-tip regions in engineering materials is presented. The principal tool of this initial investigation is dynamic moiré interferometry, which yields full-field continuum boundary conditions of surface displacement in a real-time optical processing manner. The displacement sensitivity employed for this study is 3.3 ?m; however, the displacement sensitivity can be as high as 0.2 ?m. The spatial resolution developed is less than 1 mm. After a brief review of the technique of dynamic moiré interferometry, the study of a longitudinal pulse, interacting with an artificial crack in a finite steel bar, is presented. Equations for the near-tip elastic dynamic crack displacements will be reexamined to extract localized elastic dynamic stress-intensity factors in light of the capabilities of dynamic moiré interferometry.