外压作用下结构参数对夹层管屈曲性能的影响

The Influence of Structure Parameters on Buckling Behaviour of Sandwich Pipe Under External Pressure

为研究深海夹层管的屈曲问题,运用有限元软件ABAQUS建立在静水压力作用下夹层管的数值模型,考虑夹芯层与内外管不同的黏结方式,阐明了一系列结构参数对夹层管屈曲压力与特征路径的影响机理。结果表明:随着参数变化,夹层管存在三种不同的特征路径;夹芯层与内外管的黏结方式对夹层管的屈曲性能有着十分明显的影响;增大内外管的厚径比和钢材等级能够提高夹层管的屈曲失稳压力,而改变夹芯层的厚度和刚度不仅能提高夹层管的屈曲压力,甚至还能改变结构的特征路径类型。

To study the buckling problem of deepwater sandwich pipes,a numerical model of sandwich pipes under hydrostatic pressure was established by using the finite element software ABAQUS. Considering about various intra-layer adhesion properties between the core layer and the surrounding pipes,the the influencing mechanisms of a series of structural parameters on buckling capacity and characteristic paths was illustrated.The results show that sandwich pipes would exhibit three categories of characteristic paths depending on the pipe properties.The intra-layer adhesion properties of sandwich pipe could have a significant influence on buckling capacity.Improving the thickness to radius ratio or steel grades of either the internal or external pipes increased the pressure capacity of the system. While changing the thickness or stiffness of the core layer would significantly influence the capacity of the system and would even change the pipe’s characteristic behavior category.