大型空气球罐开孔结构的强度评定及疲劳分析

采用应力强度评定与疲劳分析的方式探究球罐开孔结构是否满足设计应力强度要求，以2 000 m³的大型空气球罐为例，利用有限元分析软件对空气球罐上、下极板进行了设计工况下的静力分析。计算得到球罐下极板最大应力强度值为334.07 MPa，位于人孔M2凸缘内拐角处，上极板最大应力强度值为404.28 MPa，位于放空口N4接管内壁。在球罐开孔结构选取的14条路径上的应力值作为强度评定依据，上、下极板的最大应力值作为疲劳分析依据。结果表明:其计算结果均满足强度评定标准，空气球罐开孔结构交变应力满足疲劳要求，大型空气球罐开孔结构的设计满足设计应力强度要求。

Strength Evaluation and Fatigue Analysis of Large Air Spherical Tank with Opening Structure

Using stress strength assessment and fatigue analysis， we explored whether the spherical tank with opening structure meets the design requirement for stress strength. Taking a large air spherical tank of 2 000 m³ as an example， we investigated static of upper and lower plates of air spherical tank under design conditions by finite element analysis software.It is calculated that the maximum stress intensity of the lower plate of the spherical tank is 334.07 MPa， which is located at the inner corner of M2 flange of manhole， and the maximum stress intensity of the upper plate is 404.28 MPa at the inner wall of N4 nozzle of the vent. The stress values of 14 paths selected from the the spherical tank with opening structure were used as the basis for strength evaluation and the maximum stress values of upper and lower plates were used as the basis for fatigue analysis. The results show that the calculated results satisfy the strength evaluation criteria , the alternating stress of the air spherical tank with opening structure meets the fatigue requirements， and its design of satisfies design stress strength requirements.