1. 1) Manabe, K.:Press Working, 56-1 (2018), 18-23.
2. 2) Nishimura, H.:Press Working, 56-1 (2018), 24-31.
3. 3) Yoshida, Y.:J. Jpn. Soc. Technol. Plast., 51-591 (2010), 313-317.
4. 4) JIS Z2241:2011. Metallic materials ― Tensile testing ― Method of test at room temperature.
5. 5) ISO 8496:2013. Metallic materials ― Tube ― Ring tensile test.