曲げ試験によるバウシンガ効果と板面異方性の測定

概要

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Abstract　Owing to the difficulty of the plastic uniaxial compression test in plate specimen, only the uniaxial tension test has been made in most of investigations on the planar anisotropy. In this study, the bending test was performed to determine the tensile and compressive strengths of an anisotropic steel plate. Namely, the Bauschinger effect and the planar anisotropy of a material were examined using bending specimens cut at various angles to the tensile prestraining direction. The anisotropic yield function proposed by the authors was applied to the experimental results and its validity was examined. The main result are as follows: (1) The Bauschinger effect factor, the ratio of the compressive yield stress to the prestress in tension test, decreases at first with an increase of prestrain and tends toward a limiting value. On the other hand, the ratio of the compressive yield stress to the tensile one obtained from bending test is independent of prestrain. (2) The planar anisotropy of the tensile and compressive yield stresses can be quantitatively determined from bending test by applying the Nakanishi theory with partial corrections. (3) The calculation of the yield function is in good agreement with the experimental results.
山形大学の論文
1989-01-20