平滑丸棒引張および円周切欠引張におけるくびれ成長のモデル

抄録

The neck growth by plastic working was investigated by circumferentially notched tension test and smooth round tension test at room temperature. The neck ratio, defined as the radius of the neck section divided by the radius of the neck curvature, changes with the true strain. The initial notch shape affects the neck growth by plastic working before local necking but it has no effect after local necking. Therefore, changes in the neck ratio with the true strain before and after local necking were expressed by different neck growth models for the circumferentially notched tension. The neck growth models on the smooth round tension and the circumferentially notched tension are in reasonable agreement with the experimental results.