Shigeo Muromachi, Hiromichi Inoui and Kazuhiro Moriyama
The authors carried out the bending test of 13 Cr steel with different sizes. The process of the bending test studied was divided into the following four steps:
(1) The elastic bending: (2) Inner radius of the specimen contacts with the jig radius: (3) The bending angle moves up to 150°: (4) After 150°, the loading direction changes to right angle to before and bending to 180°:The experimental results showed that the bending rate of angle proportionates with the partial maximum elongation in the second period, and after the 3rd period, theoretically the following equation has been found, des max/dx=0. Inotherwords, the partial maximum elongation shows to be constant during this step. And furthere testing has been found to be useless.
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