軟鋼の曲げ加工竝に曲げ加工による残留歪及び残留應力の研究

概要

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On the assumption that the stress-strain relation in the tension test holds in the case of bending, the general theory of the plastic bending of a mild steel beam having a section, which is unsymmetrical to the elastic neutral axis, was developed. This theory was applied to some special cases of practical interest. As an example, trapezoidal section beam and rectangular section beam were numerically treated, and the moment-curvature relations and the stress-distributions in these cases were graphically shown, using the ratio of the upper yield point to the lower one as a parameter. In the latter part, the general theory on residual stress and residual curvature due to plastic bending was derived, on the assumption that the stress-strain relation of plastically strained rod at unloading holds in the case of bending. As an example, the application of this theory to the trapezoidal section beam and rectangular section beam were treated. On the basis of these applied theories, the numerical value of residual stress and curvature of these beams were obtained. In consequence of these calculations, it was noticed that the residual stress on the tension-side of beam was negative and the positive residual stress acted on the compression-side.
社団法人日本船舶海洋工学会の論文
1939-03-10