画像解析を用いた有限歪の計測に関する研究

（引張の変形過程で生じる局部変形の発達状況に及ぼす剪断の予変形の変形履歴の影響について）

抄録

Since the additive law of strain on an identical line element can be satisfied and the rigid body rotation can be clearly removed from the shearing strain component, the Natural Strain theory is effective strain representation which can systematically treat from infinitesimal deformation to the large deformation. Taking advantage of Natural Strain theory in to the image analysis, the purpose of this study is to make clear effects of changes in the material, such as strain hardening, on the progress of local deformation under large deformation. In the present study, in order to elucidate effects of changes of material property on the progress of local deformation, the local deformation during the tensile deformation is investigated by using the test pieces, which are preliminary applied the shear deformation. Especially, conducting the experiments for pre-deformation of shear with different types of deformation history, effects of those deformation histories and values on the progress of local deformation during tensile deformation are revealed.