1 December 1991 Material testing by the laser speckle strain gauge
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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.
© (1991) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Ichirou Yamaguchi, Ichirou Yamaguchi, Koichi Kobayashi, Koichi Kobayashi, "Material testing by the laser speckle strain gauge", Proc. SPIE 1554, Second International Conference on Photomechanics and Speckle Metrology, (1 December 1991); doi: 10.1117/12.49544; https://doi.org/10.1117/12.49544


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