力-热载荷下双金属复合管的屈曲失效研究

采用有限元方法研究了力-热载荷下双金属复合管的屈曲失效行为,通过三维有限元建模考虑了双金属复合管的准静态复合成型制造过程中产生的残余应力,分析了温度及内压两个主要参数对双金属复合管屈曲失效的影响。结果表明,高温导致材料发生软化,抑制了双金属复合管的屈曲;弯矩、内压及热载荷联合作用下,复合管内介质温度降低,复合管弯矩达到最大值对应的曲率减小,而弯曲承载能力增大,外基管的椭圆率也增大;内压变化对复合管的弯曲承载能力和外基管的椭圆率影响较小。

Research on liner buckling and collapse of bi-material metal pipes subjected to mechanical-thermal loading

In this paper,liner buckling and collapse of bi-material metal pipes subjected to mechanical-thermal loading were studied by using the finite element method.A 3-D finite element model was developed by considering the residual stress produced in the quasi-static inflation process of the bi-material metal pipes.Effects of temperature and internal pressure on the liner buckling and collapse of the bi-material metal pipes were analyzed in detail.The results show that the liner buckling and collapse of bi-material metal pipe is suppressed under mechanical-thermal loading due to their material softening.The curvature of the maximum bending moment of bi-material metal pipes subjected to the bending,internal pressure and thermal loading decreases with decreasing the internal temperature while both the load-carrying capability of the bi-material metal pipes and the ellipticity of outer pipes increases.The internal pressure changes have a little effect on the load-carrying capability of bi-material metal pipes and the ellipticity of outer pipes.