某燃料运输容器在多过程序贯冲击条件下的动态力学响应特征

Dynamic Response Characteristics of a Fuel Transport Cask in Multi-process Sequential Impact Condition

目的识别某燃料运输容器在国标规范要求的多过程序贯冲击条件下的冲击响应特性,为运输容器的安全设计及防护措施等提供参考。方法开展运输容器在1.2 m高度侧跌、钢棒1 m高度贯穿、500 kg重物9 m高度冲砸和1 m高度穿刺等4种事故场景顺序叠加作用条件下的多过程序贯冲击试验,同时开展相应的冲击损伤累积有限元模拟分析,研究运输容器结构在多种冲击载荷序贯叠加作用下的动态响应特征。结果模拟结果同试验结果符合较好,验证了冲击损伤累积有限元模拟方法的正确性和实用性。试验结果和数值模拟结果均显示在多过程序贯冲击条件下,容器缓冲结构起到很好的防护作用,可对燃料部件产生有效防护,且结构功能保持完好。结论燃料运输容器具有很好的缓冲性能,可以满足国标规定的多过程序贯冲击条件下的防护要求。冲击损伤累积有限元模拟方法可较准确地分析复杂结构在多过程序贯冲击条件下的动态响应特征,具有较好的实用性。

The work aims to analyze the dynamic response characteristics of a fuel transport cask under multi-process sequential impact scenarios required by related national standards to support the structural safety design and the protective technology for the cask.Firstly,multi-process sequential impact tests on the cask were conducted regarding to four accident scenarios,i.e.,lateral drop at 1.2 m height,steel rod penetration at 1 m height,500 kg weight impact at 9 m height,and puncture at 1 m height,etc.and then the corresponding finite element simulations considering impact damage accumulation were conducted integrated with the experiments.The dynamic response characteristics of fuel transport cask under the sequential impact condition of four accident scenarios were analyzed in detail.Related analysis showed that the simulation results agreed well with the experiment results,and thus the correctness and practicality of finite element simulation approach with cumulative impact damage were verified.Both the test results and numerical simulation results showed that the buffer structure of the cask played a very good role in protecting the fuel components under the condition of excessive penetration impact,and the structure and function remained intact.The fuel transport cask has good cushioning performance and can meet the protection requirements under the multi-process sequential impact condition.The impact damage accumulation finite element simulation method can accurately analyze the dynamic response characteristics of complex structures under multiple sequential impact conditions,and has good practicability.