221 皮膜散乱光法による表面ひずみの測定(OS6-5 光弾性法II)(OS6 実験力学の新展開)  [in Japanese] 221 Strain Measurement of Surface Coatings by the Scattered-light Method  [in Japanese]

A method for measuring surface strains of real specimens is proposed using the scattering photoviscoplastic analysis with polyester coating. A major advantage of this experimental technique is that interference fringes in the vicinity of the adhesion plane bounding the real specimen and the coating can be observed. The difference in principal strains on the symmetric section of real specimen in two dimensional problems can be calculated using two kinds of scattered-light fringe patterns obtained by two different incidences of polarized light. For the demonstration of effectiveness of this method, surface strains of semicircular notched plate specimen made of aluminum alloy were measured under uniaxial tension. Normal strains on the notched section were estimated and the distributions were consistent with FEM analyses.