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为了防止复合管内管鼓包产生的失效失稳状况,通过有限元软件对规格为Φ219 mm×(14.3+3)mm机械式复合管的鼓包现象进行了屈曲分析。分析结果显示,复合管在内外管之间的气体压力和温度共同作用下会出现鼓包失效,且气体压力越大、加热温度越高、内管壁厚越薄、焊接间距越小,机械式复合管越容易发生鼓包现象。研究结果表明,径向载荷是导致机械式复合管鼓包的主要因素,因此可以通过控制其内外管之间的气体压力和使用温度降低复合管发生鼓包的概率,同时可以通过在复合管内添加焊点来提高其面内刚度,最终达到提高复合管抗鼓包能力的目的。
In order to prevent failure instability caused by tube bulge in composite tube, buckling analysis was performed on bulging phenomenon of mechanical composite tube with Φ219 mm × (14.3 +3) mm mechanical composite tube by finite element software. The analysis results show that the composite tube will appear the failure of drum when the gas pressure and temperature between the inner and outer tubes are combined. The larger the gas pressure, the higher the heating temperature, the thinner the inner wall thickness, the smaller the welding spacing, the mechanical composite Tube more prone to bulging phenomenon. The results show that the radial load is the main factor leading to the bulge of the mechanical composite pipe. Therefore, it is possible to reduce the probability of bulging of the composite pipe by controlling the gas pressure and the operating temperature between the inner and outer pipes, and at the same time, To improve its in-plane stiffness, and ultimately to improve the composite tube anti-bulging ability.