抄録
It is supposed that the effect of shear strain layer of the drawn wire surface is one of the causes of "size effect". The relations between tensile strength and wire diameter were investigated by examining the depth of shear strain layer. As the result, it is concluded that: (1) on drawing process, no matter wire size, the depth of shear strain layer is almost the same in every process. Therefore larger area of fine wire section is occupied by these shear strain layer. (2) the shear strain layer is not piled up in each process. (3) the shear strain layer remarkably effects on tensile strength of fine wire.
