机械式复合管热载荷作用下的屈曲分析

Buckling Analysis of Mechanical Composite Pipe under Thermal Load

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 the failure and instability caused by the lined pipe bulge of composite pipe, it carried out buckling analyses for bulge phenomenon ofΦ219 mmx（14.3＋3） mm mechanical composite pipe. The analysis results indicated that, under the combined action of gas pressure and temperature, the bulge phenomenon appeared. The greater gas pressure, the higher the heating temperature, the thinner of lined pipe wall thickness, the smaller weld-spacing, and the bulge occurred more easily. Research results showed that the radial load was the main factor lead to mechanical composite tube bulge, thus through controlling gas pressure and temperature, it can reduce the bulge probability, at the same time, by adding the solder joints in lined pipe to increase its stiffness, ultimately achieved the goal of improving composite pipe bulge resistance.