ABSTRACT

While evaluating the secondary impact of transport casks under the oblique drop tests based on the IAEA transport regulation, it is important to find the most severe condition defined with respect to the oblique angle of the cask attitude during its fall.Currently the costly finite element method is generally used for this purpose.In this study, a simplified theoretical method has been proposed for easy evaluation of the secondary impact of transport casks under the oblique drop test.In this hand calculation method (HCM), only the following two parameters are required to express cask characteristics: the compressive strength of the shock absorber and the representative spring constant of the cask, such that the oblique angle dependency on the secondary impact velocity can be easily obtained comparing to the FEM analyses.The HCM results indicate that a low compressive strength of the shock absorber results in large oblique angle of the cask attitude being associated with the maximum secondary impact velocity.It is also observed that a small spring constant specified by the cask body structure results in high secondary impact velocity.The HCM can provide cask engineers with useful information for easy evaluation of the secondary impact of casks.

摘要

在根据 IAEA 运输法规评估斜向跌落试验下运输木桶的二次冲击时，重要的是找到关于木桶坠落过程中倾斜角度定义的最严酷条件。 目前昂贵的有限元方法一般用于此目的。本研究提出了一种简化的理论方法，以便于评估斜落试验下运输桶的二次冲击。在这种手算方法（HCM）中，只需要以下两个参数表达木桶特性：减震器的抗压强度和木桶的代表性弹簧常数，这样与 FEM 分析相比，可以轻松获得斜角对二次冲击速度的依赖性。HCM 结果表明，减振器的低抗压强度导致桶姿态的大倾斜角与最大二次冲击速度相关。还观察到桶体结构指定的小弹簧常数导致高二次冲击速度。冲击速度。HCM 可以为木桶工程师提供有用的信息，以便轻松评估木桶的二次冲击。