冷鍛変形能の試験法について

概要

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After investigating the compression testing method against a plate type specimen by the cylindrical die as a cold forgeability which, when the history of strain during deformation is linear makes it possible to calculate the stress by the total strain theory, the underwritten facts have been confirmed.(1) The optimum conditions can be gained if a plate type specimen with thickness H, width 2H and radius of curvature of initial bulge profile (3.3∼6.6) H, is compressed by a cylindrical dies.(2) In the test under such a condition if only the tatal strain in height at fracture is measured, the local strain at the part where a crack occurs and the stress can be calculated accurately.
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