SUPRAPEDI and Satoru TOYOOKA

Graduate School of Science and Engineering, Saitama University, 255, Shimo-okubo, Urawa, Saitama, 338 Japan

(Received September 25, 1996; Accepted December 13, 1996)

Time-division digital speckle pattern interferometry to observe temporal variation of in-plane deformation fields of a whole process of plastic deformation until fracture was proposed. Experiment of tensile test of an aluminum plate exhibited dynamic movements of successive fringe patterns which were very complicated. They suggest that plastic deformation propagates nonlinearly in the specimen by repetition of energy relaxation processes and concentration processes.

Key words : plastic deformation, speckle, fringe, boundary, time-division, digital speckle pattern interferometry

*Presented at 1996 International Workshop on Interferometory (IWI '96), August 27-29, Wako, Saitama, Japan.