画像解析を用いたゴムの有限歪の計測

（引張の予変形後の剪断で得られる断面内の歪とワーピングの分布の特徴）

抄録

The purpose of this study is to examine distributions of shearing strain and warping in a square cross section shaft when a large shear deformation is applied to rubber specimens on the basis of the image analysis proposed in this study. In our previous study, changing the values of shear deformation variously, the shearing strains on the surface of test pieces are investigated. Those distributions along the cross section have been examined and compared with the results based on the conventional torsional theory of square cross section proposed by Saint-Venant. In the present study, the large shear deformation after applying the uniaxial tension is examined. Especially, the distributions of warping along a cross section are compared with the experimental results obtained by only applying shear deformation, and the effect of tension on the distribution of warping is revealed.