Development of cast collision absorption parts

阐明了形状系数、材料系数等因素对阶梯圆管在轴向静载和动态挤压作用下伸缩变形的峰值应力和平均应力的影响。阐明了决定冲力峰值和吸能效率的冲力平均值的预测技术，以及决定冲力峰值和吸能效率的主要形状几何参数和材料参数等。

Influence of a form factor, a material factor, etc. on the peak stress and mean stress for telescopic deformation of stepped circular tube subjected to axial static load or dynamic crushing was clarified. The prediction technique of the average value of impulse force, which is a parameter determining the peak and energy absorption efficiency of impulse force, the parameter of the main form geometry and material, etc., which governs those indices, were clarified.