Abstract
The method of finite strain measurement based on the image analysis is suggested by using the Natural Strain theory. The effectiveness of this measurement method is verified by comparing the strain measurement by the image analysis with the conventional measurement based on the displacement meter, and the validity of this method has been examined for uni-axial tension and simple shear. However, in our previous study, the validity of this method was confirmed by the measurements within the uniform deformation, and the local deformation has not been examined yet. So, the measurement under local deformation is examined in this paper. Especially, the measurements of local deformation for simple shear after uni-axial tension are conducted by using the image analysis, and the result obtained at the middle portion of the specimen is compared with the result of upper portion of the specimen.
