波型隔壁板の塑性力学 (第1報)

横衝撃力による波型梁の大きな変形について

抄録

In this report, the corrugated beam of section as shown in Fig. I with both supported ends under transverse impact is discussed first before the problem on large plastic deformations of corrugated bulkheads will be taken. The deformation of ', finite solid beam under transverse impact is solved by Bleich and Salvadori applying the elastic-plastic analysis. There, however, are some unreasonable phenomena with plastic moment conditions along the lengthwise direction.
From the other different view-point of this analysis, the same problem is again carried out by Lee, Symonds and Pian applying the perfect plastic analysis of plastic moment idea. They point out that the perfect plastic analysis is available with sufficient accuracy to obtain the large deformation of beam Tenerally considered as elastic-plastic, only if the final strain after finite time elapsed is considerably larger compared with the elastic strain.
In order to get the final plastic deformations systematically under impacts with several load shapes, the author wants to develop solutions about beam of both supported ends to make them ppplicable to the present case. Experiments were worked out with several specimens made from mild steel or copper alloy. The experimental formulas are decided from both theoretical and experimental results. The approximate formula including the several load shapes is also given to be available to practical purposes of initial design.