The effect of the material hardening model of the canister on a finite element vertical cask drop simulation is investigated for the strain-based acceptance evaluation. Three different hardening models are considered in this paper: the isotropic hardening model, the strain rate-dependent Johnson-Cook (J-C) hardening model, and the modified J-C model which are believed to be the most accurate. By comparing the results using the modified J-C model, it is found that the use of the J-C model provides similar or larger stresses and strains depending on the magnitudes of the strain and strain rate. The use of the isotropic hardening model always yields larger stresses and strains. For the strain-based acceptance evaluation, the use of the isotropic hardening model can produce highly conservative assessment results. The use of the J-C model, however, produces satisfactory results.

研究了罐材料硬化模型对有限元垂直桶落模拟的影响，用于基于应变的验收评估。本文考虑了三种不同的硬化模型：各向同性硬化模型、应变率相关的 Johnson-Cook (JC) 硬化模型和被认为是最准确的修正 JC 模型。通过使用修改后的 JC 模型比较结果，发现 JC 模型的使用提供了相似或更大的应力和应变，具体取决于应变和应变率的大小。使用各向同性硬化模型总是会产生更大的应力和应变。对于基于应变的验收评估，使用各向同性硬化模型可以产生高度保守的评估结果。然而，使用 JC 模型，