SYMPOSIA PAPER Published: 01 January 1988
STP33090S

Dynamic Moiré Interferometry Studies of Stress Wave and Crack-Tip Diffraction Events in 1018 Steel

Source

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 μm; however, the displacement sensitivity can be as high as 0.2 μm. 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.

Author Information

Epstein, JS
Materials Science Div., Idaho National Engineering Laboratory, Idaho Falls, ID
Deason, VA
Sensors and Diagnostics Div., Idaho National Engineering Laboratory, Idaho Falls, ID
Reuter, WG
Materials Science Div., Idaho National Engineering Laboratory, Idaho Falls, ID
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Details
Developed by Committee: E08
Pages: 482–503
DOI: 10.1520/STP33090S
ISBN-EB: 978-0-8031-5041-6
ISBN-13: 978-0-8031-0972-8