電子部品用SUS304ステンレス鋼板の引張／圧縮応力の非対称性とその曲げおよびスプリングバック挙動への影響

概要

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In-plane tension and compression experiments on an austenitic stainless steel sheet SUS304 0.3 mm in thickness for electronic parts were conducted using a specially designed testing apparatus. The apparatus is equipped with comb-type dies so that stress–strain curves of a sheet specimen subjected to tension followed by compression, and vice versa, can be measured without buckling of the specimen, as well as those for monotonic tension and compression. A difference was observed in the flow stresses between tension and compression for the test material both in the rolling and transverse directions. Moreover, stress reversal tests, such as tension followed by compression and compression followed by tension, were carried out in order to measure the Bauschinger effect. In the second part of the experiment, bending moment–curvature diagrams were measured both in the rolling and transverse bending. The bending moment–curvature diagrams were compared with those calculated using the stress–strain curves obtained from the tension–compression tests, and were in good agreement with those calculated with the tension–compression asymmetry and the Bauschinger effect correctly reproduced.