Study on Finite Strain Measurements using Image Analysis

(Effect of Strain Amplitude in Cycle Shear on Local Deformation during Process of Tensile Deformation)

Abstract

The purpose of this research is to investigate progression of local deformation generated under large deformation by using image analysis based on Natural Strain theory. In our previous research, the different total plastic strain and strain hardening are given in the test specimens by applying shear deformation in the forward and reverse direction alternately. And then, the progression of local deformation generated during tensile deformation after the pre-deformation of cyclic shear has been examined. As a consequence, it has been confirmed from the comparison of image daters at upper and middle positions with the results by displacement mater that local deformation begins to occur in the earlier stage of tensile deformation in the case of the cyclic shear more progress. In the present study, the progress of local deformation generated during tensile deformation after the pre-deformation of cyclic shear is examined under conditions that the strain amplitude and the number of cycle are greater than previous them.