力-热载荷下双金属复合管的屈曲失效研究

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.