材料の加工硬化が板の座屈・塑性崩壊強度に及ぼす影響に関する研究

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In this paper, series of elasto-plastic large deflection analyses were performed by the finite element method to investigate into the fundamental influences of strain hardening of the material upon buckling/plastic collapse behaviour of plates under thrust. Two types of stress-strain relationships were assumed in the analyses, which are a bilinear relationship and an asymptotic relationship. It has been found that: (1) Strain hardening has little influence on ultimate strength of thin plates, but has large influence on that of a thick plate. (2) Strain hardening has large influence on post-ultimate strength behaviour of both thin and thick plates. When the strain hardening rate is relatively high, the load carrying capacity after the ultimate strength does not drop down so much, and becomes higher than the ultimate strength with the increase in deformation. (3) The maximum load is attained only in a certain range of the slenderness ratio of a plate when the stress-strain relation-ship is represented by an asymptotic curve. (4) The post-buckling behaviour is quite different between a plate with an asymptotic stress-strain relationship and that with a bilinear stress-strain relationship, when the elastically evaluated buckling stength is nearly equal to the proportional limit. Based on the results of calculation, strength criterion against buckling/plastic collapse was proposed for plates with high strain hardening rate assuming some critical magnitude of lateral deflection.
社団法人日本船舶海洋工学会の論文
1991-09-04

材料の加工硬化が板の座屈・塑性崩壊強度に及ぼす影響に関する研究

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