多层包扎高压容器端部结构设计与应力分析

DESIGN AND STRESS ANALYSIS OF THE END STRUCTURE OF MULTILAYER-WRAPPED HIGH-PRESSURE VESSEL

多层包扎压力容器中由于球形封头与筒体连接处有壁厚突变,在此区域将产生很大的应力集中和边缘应力,因此多层包扎式高压容器的端部结构是设计中须认真考虑的问题。参照ASME规范设计了3种多层包扎筒体与球形封头连接结构,并利用ANSYS软件提供的接触单元建立了相对应的有限元模型。通过将有限元计算值与理论计算值对比,验证了该模型的可行性。文章分析了3种结构的应力分布情况,指出了最适宜的连接结构为(b)结构,并对(b)结构进行了应力强度评定,结果表明该结构满足强度要求。

In multilayer-wrapped pressure vessel,the connecting region of cylinder shell and spherical head has a significant edge stress and stress concentration due to its wall thickness mutation.Therefore,the design of the end structure of multilayer-wrapped high pressure vessel needs to be considered seriously.Referring to the ASME Code,three kinds of joint structure of multilayer-wrapped cylinder shell and spherical head are designed.Also,the corresponding finite element model is established by using the contact element provided by the ANSYS software.The feasibility of the model is verified by comparing the finite element results with the theoretical values.Meanwhile,the stress distribution law of these three kinds of structure is analyzed.The paper points out that the most suitable joint structure is b-structure,and then strength assessment of bstructure is carried out.The results show that b-structure satisfies the requirement of strength.