【摘要】 为了减小真空冷箱在低温工作状态下受到的大气压力、设备重力以及内部管道因降温收缩而产生的热应力的复合作用,运用ANSYS有限元分析软件模拟冷箱和管道的应力场及变形.结果表明:管道的热应力随管道直径、相对弯曲度的增大而增大;冷箱最大变形发生在上法兰中间区域,应力集中在冷箱壁与加强筋相交区域.根据计算的结果,针对性地提出了适当减小管道直径和相对弯曲度以及增设加强筋和加固壁的改进方案.改进后的计算结果表明,冷箱的最大变形值由9.7mm减小到1.3 mm,应力和变形分布趋于平缓,达到了优化设计的效果.本研究为冷中子源氦制冷系统的设计,提高系统工作的稳定性和可靠性提供了技术参考.更多还原

【Abstract】 In order to reduce the complex action caused by atmospheric pressure,gravity,and the thermal stress resulting from temperature change for a vacuum cold-box at lower temperatures,the stress and deformation of its top cover were numerically simulated by means of finite element analysis software ANSYS.The results show that the stress and deformation increase with the increase of the diameter,thickness and bending of pipes.The maximum deformation occurs in the middle field of top cover and the stress concentration occurs in the joint of reinforced ribs and wall of cold-box.On the basis of the analysis,an improved design of cold-box and pipes was developed to reduce stress and deformation including reducing the diameter and bending of pipes and adopting the reinforced ribs and walls.For the cold-box improved,the maximum deformation decreases from 9.7 mm to 1.3mm and the distribution of stress and deformation becomes smoother.更多还原