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A study on the free drop impact of a cask using commercial FEA codes

机译：使用商业有限元分析法研究桶的自由下落影响

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摘要

The package used to transport radioactive materials, which is called a cask, must be designed to keep its contents safe under normal and hypothetical accident conditions. The design requirements of the cask are verified by test or finite element analysis (FEA). Comparing evaluation procedures for the safety of a new cask, the cost of FEA is generally much less than that test. Therefore, FEA is mainly used to verify safety of a cask under the considered conditions. However, one commercial FEA code may show different results from another FEA code for the same problem due to the modeler's several assumptions for simplifying actual states into the FE model and due to modeling technique. Materials of the components of a cask display elastic-plastic or elastic-perfectly plastic behavior under the considered conditions in which large deformation, impact and contact mechanism are included. The behavior is simulated with difficulty and may have different results depending on FEA codes. In this paper, finite element analysis is carried out for the 9-m free drop and the puncture condition under the hypothetical accident condition by using LS-DYNA3D and ABAQUS/Explicit. Energy and effective stress on each component are presented and compared between the two FEA codes, where the effective stress designates the maximum von Mises stress on inner and outer shells.
机译：用于运输放射性物质的包装（称为木桶）必须经过精心设计，以确保其内容物在正常和假设的事故情况下均安全。桶的设计要求已通过测试或有限元分析（FEA）进行了验证。比较评估新桶安全性的评估程序，FEA的成本通常比测试成本低得多。因此，FEA主要用于在考虑的条件下验证桶的安全性。但是，由于建模者为简化将实际状态简化为FE模型的几种假设，并且由于建模技术的原因，针对同一问题，一个商用FEA代码可能会显示与另一FEA代码不同的结果。在考虑了包括大的变形，冲击和接触机理的条件下，桶的部件的材料显示出弹塑性或弹性完美的塑性行为。该行为很难模拟，并且根据FEA代码可能会有不同的结果。本文使用LS-DYNA3D和ABAQUS / Explicit对假设的事故工况下9 m自由落体和穿刺条件进行了有限元分析。给出了每个组件的能量和有效应力，并在两个FEA规范之间进行了比较，其中有效应力表示内壳和外壳上的最大冯·米塞斯应力。

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