反应堆压力容器防断裂一体化有限元分析
Integrated Anti-Crack Finite Element Analysis of Reactor Pressure Vessel
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摘要:
压力容器在放射性等复杂的载荷下工作，容易引起工程结构的疲劳裂纹扩展，进而导致灾难性的破坏。我们利用自主开发的一体化结构有限元分析软件ATLAS对防断裂问题进行分析。该软件根据结构有限元分析的应用特点，在特殊的数据结构基础上充分利用GPU的三维渲染能力，并做了大量的优化工作，能让CAE工程师在高度交互及可视化的环境下进行仿真分析工作。我们首先分析微观孔洞大小及位置对应力分布的影响，然后以压力容器为例，针对其结构及受力状况建立模型及载荷约束，对其各部位受力及变形情况进行分析。在完成有限元求解后，我们对计算结果进行应力线性化，得到应力强度因子。我们依照ASME BPVC III D1附录G的标准进行防断裂分析校核，通过计算数值的比较得出是否满足防断裂要求的结论。基于ATLAS软件提出的压力容器防断裂一体化有限元分析方法可用于压力容器延寿等工程实践中。 Abstract:Under the loads of radioactive and other complex work conditions, reactor pressure vessel is prone to fatigue crack propagation of structures, which could lead to catastrophic damage. In this paper we introduced the developed finite element software ATLAS. By fully using of three-dimensional rendering capabilities of the GPU, ATLAS provided a large-scale highly interactive visualization environment for engineers. At first, ATLAS was used to analyze the size and location impact of the stress and displacement. Then, according to the structures and the forces of the pressure vessel, we created the model and load constraints, and analyzed the stress and deformation of the pressure vessel, simulated its working conditions, and determined its overall service life and weakness. We found that ATLAS can quickly calculate the stress linearization and the stress intensity factor, and complete the crack CAE analysis. In addition, we tested the anti-fracture analysis in accordance with ASME BPVC III D1 Standard Appendix G. By comparing the calculated values, conclusions can be drawn on whether it meets the anti-fracture requirements or not.
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