铀溶液临界装置热应力分析

铀溶液临界装置为夹套高架容器,其结构较复杂,三维尺寸大且不对称,采用ANSYS进行热分析时,如果采用完整的三维实体模型计算,其单元数据将非常庞大,普通台式机无法完成求解.为完成计算而又不使结果出现较大误差,必须合理有效地简化有限元模型.最终将受热影响较轻微的部分结构截掉,仅保留温度梯度较大的区域,且采用反对称的方法施加简化模型的边界约束.在简化计算模型的同时,保证了计算结果的可靠性,从而得到了满意的热应力结果.对于大尺寸不对称结构的热应力分析,根据结构载荷的具体情况合理简化模型,并有效施加边界约束显得至关重要.

Thermal Stress Analysis of Uranium Solution Critical Facility

The uranium solution critical facility is an overhead double vessel, which has complicated structure and huge unsymmetrical three-dimensional sizes, if the thermal stress analysis is carried through using three-dimensional entity model, the model has so many elements and the general computer has not enough solving ability. The element model must be simplified effectively and logically in order to finish the solution while the error is not too much. At last the structure which is influenced slightly by heat is omitted, only the zone which has higher temperature grads is selected, and the unsymmetrical restricting method is adopted to apply the boundary condition to the predigested model effectively. The solution model is simplified greatly while the reliability of the results is ensured, so the satisfying thermal stress results are gotten. It is very important for simplifying the solution model logically and applying the boundary conditions effectively according to the given structure and loads when carrying through the thermal analysis of the unsymmetrical structure with huge sizes.