内压和弯矩作用下圆柱壳周向斜接管结构设计分析

Design Analysis for Cylindrical Shell with Hillside Nozzle Structure under Internal Pressure and Moment

周向斜接管结构应用广泛,但相对于径向接管结构,尚缺乏系统的设计方法研究。采用有限元法计算不同结构参数下分别受内压和接管横向弯矩作用下圆柱壳周向斜接管结构的弹性应力,绘制了不同结构参数下各应力分量的应力集中系数图。研究结果表明,圆柱壳周向斜接管结构根据各种载荷下各截面的应力集中系数Km和Kb,并按应力叠加规则得到的一次薄膜应力强度Sm和一次薄膜加弯曲应力强度S与在内压和横向弯矩共同作用下的应力结果误差不大于10%,应力叠加规则有效、可靠。研究结果可为内压与弯矩作用下周向斜接管结构工程设计提供依据。

The hillside nozzle structure is widely used in many fields, but it is still lack of systematic study of design methods compared with the radial nozzle structure. The elastic stress of cylinder shell with hill- side nozzle under internal pressure and transverse bending moment with different structural parameters were respectively calculated by finite element method, and the curve of stress concentration factor of each stress component under different structural parameters were drawn. The results show that the error between the primary membrane stress intensity Sm, the primary membrane stress plus the bending stress intensity S which were calculated by the stress superposition rule according to various sections of the stress concentration factor Km and Kb under various loads and the stress intensity under the combination of internal pressure and transverse bending moment are not more than 10%, so the stress superposition rule is effective and reliable. The results of this study may provide the basis for engineering design of cylindrical shell with hillside nozzle structure under the combination of internal pressure and moment.