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Collapse of RTP (Reinforced Thermoplastic Pipe) Subjected to External Pressure

机译:承受外部压力的RTP(增强热塑性塑料管)的崩溃

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The collapse of RTP under uniform external hydrostatic pressure is investigated in this paper. Extended from the model initially proposed by Kyriakides and his co-workers, a 2D theoretical model which takes into account the mean radius change, the wall thickness change, transverse shear deformation, and pre-buckling deformation is further developed. The reinforced layers, consisting of PE and aramid strands, are taken as homogeneous layers and equivalent stiffness method is used to get their mechanical parameters. J2 flow theory with isotropic hardening is adopted to model the plastic property of the material. By means of numerical calculation, the ovalization-pressure curve and ovalization-strain curve of RTP is presented. To confirm the accuracy of the theoretical model, numerical simulation is conducted using a 2D finite element model within the framework of ABAQUS. It is found that the results obtained by theoretical method and finite element method show good agreement. Finally, the effects of several parameters are studied by use of the theoretical model and useful conclusions are drawn.
机译:研究了均匀外部静水压力下RTP的破坏。在Kyriakides及其同事最初提出的模型的基础上,进一步发展了一个2D理论模型,该模型考虑了平均半径变化,壁厚变化,横向剪切变形和预屈曲变形。由PE和芳纶丝组成的增强层被视为均质层,并使用等效刚度法获得其力学参数。采用具有各向同性硬化的J2流动理论对材料的塑性进行建模。通过数值计算,给出了RTP的椭圆化压力曲线和椭圆化应变曲线。为了确认理论模型的准确性,在ABAQUS框架内使用2D有限元模型进行了数值模拟。结果表明,理论方法和有限元方法的计算结果吻合良好。最后,利用理论模型研究了几个参数的影响,并得出了有用的结论。

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