不锈钢陶瓷复合管材剪切过程数值模拟

快堆乏燃料组件进入快堆乏燃料后处理工艺流程的第一步便是剪切解体,因辐射的制约,通常使用不锈钢模拟元件包管和陶瓷模拟燃料芯棒进行实验。将不锈钢模拟元件包管和陶瓷模拟燃料芯棒并组成复合管材模型模拟单根快堆乏燃料组件,根据非线性有限元分析软件Abaqus中Johnson-Cook本构模型与Johnson-Holmquist ceramic(JH-2)本构模型构建不锈钢陶瓷复合管材的材料模型,模拟其剪切断裂过程,并研究不锈钢陶瓷复合管材在剪切过程中断裂损伤失效过程中受力变形情况,以及刀具进给速度、剪切间隙对剪切力的影响。结果表明最大剪切力随进给速度增大而增大,随剪切间隙增大呈现先增大后减小的趋势,能为组件剪切方案和剪切机设计提供参考。

Numerical Simulation of the Shear Process of Stainless Steel Ceramic Composite Pipe

The first step of fast reactor spent fuel components entering the fast reactor spent fuel reprocessing process is shearing and decomposition. Due to radiation limitations, scientific research experiments usually use stainless steel analog components and ceramic analog fuel core rods. The stainless steel simulation element is covered with a ceramic simulation fuel core rod to form a composite tube model to simulate a single fast reactor spent fuel assembly. According to the Johnson-Cook constitutive model and Johnson-Holmquist ceramic (JH-2) constitutive model in the nonlinear finite element analysis software Abaqus, the stainless steel-ceramic composite pipe material model is constructed to simulate the shear fracture process. In the shearing process, the fracture damage and force deformation during the failure process, as well as the influence of the tool feed speed and the shearing gap on the shearing force are studied. The results show that the maximum shearing force increases with the increase of feed speed, and presents a trend of first increasing and then decreasing with the increase of shearing gap, which can provide reference for component shearing scheme and shearing machine design.