Material testing by the laser speckle strain gauge

Ichirou Yamaguchi; Koichi Kobayashi

doi:10.1117/12.49544

1 December 1991 Material testing by the laser speckle strain gauge

Ichirou Yamaguchi, Koichi Kobayashi

Proceedings Volume 1554, Second International Conference on Photomechanics and Speckle Metrology; (1991) https://doi.org/10.1117/12.49544
Event: San Diego, '91, 1991, San Diego, CA, United States

Abstract

By means of the laser speckle strain gauge, which directly detects the elongation or contraction of microscopic structures of a diffusely reflecting surface from speckle displacement, we measured both stress-strain curve of polymer materials in the biaxial mode by loading specimens on a commercial testing machine and thermal strain of metal and polymers. In the experiments we derived Poisson's ratio and thermal expansion coefficients of various materials. We observed good agreement of the results with those obtained by other methods.

Citation Download Citation

Ichirou Yamaguchi and Koichi Kobayashi "Material testing by the laser speckle strain gauge", Proc. SPIE 1554, Second International Conference on Photomechanics and Speckle Metrology, (1 December 1991); https://doi.org/10.1117/12.49544

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