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压力容器筒体和封头的连接处由于结构不连续,易在过渡区域积累较大的应力,而当其应力超过许用应力时,就会产生裂纹,存在一定的安全隐患。以水泥仓为研究对象,利用Solid Works建立简化的容器模型,并用Workbench对其过渡区的应力进行有限元分析,研究其半锥角的变化对过渡区应力的影响。应力随着半锥角的增加而增大,且在半锥角约为35°对具有较小过渡区应力。针对过渡区域的应力集中处提出了加强圈设计,且对不同半锥角的料斗进行有限元分析。结果表明,改进方案对极值应力减小较为明显,最多减小了75.3%;并对水泥仓的安全设计具有一定的参考和指导意义。
Because of the discontinuous structure, the connection between the pressure vessel cylinder and the head is easy to accumulate large stress in the transitional region, and when its stress exceeds the allowable stress, it will crack and pose some potential safety hazard. Taking the cement silo as the research object, the simplified container model was established by using Solid Works, and the stress in the transition zone was analyzed by the finite element method with Workbench. The influence of the half cone angle on the stress in the transition zone was studied. Stress increases with increasing half-cone angle and has a smaller transition zone stress at half-cone angle of about 35 °. Aiming at the stress concentration in the transition region, a reinforced ring design was proposed and the finite element analysis of the hoppers with different half cone angles was carried out. The results show that the improvement scheme can reduce the extreme stress more obviously and reduce up to 75.3% at the most; and it is of certain reference and guidance to the safety design of cement silo.