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Plastic analysis of initially deformed thin-walled pressurized 30∘ to 180∘ pipe bends under in-plane opening bending moment
International Journal of Pressure Vessels and Piping ( IF 3 ) Pub Date : 2021-04-15 , DOI: 10.1016/j.ijpvp.2021.104415
Pronab Roy , Manish Kumar , Kallol Khan

The present study addresses outcomes of extensive nonlinear finite element analyses concerning a diverse geometric spectrum ranging from 30° to 180° pipe bend configurations accounting for the initial geometric deformations of the cross-sections resulting from the bending fabrication process. Pipe bends are modeled with the realistic and accurate cross-section by incorporating initial ovality and thinning/thickening (together called initial geometric imperfection) up to 20%. The modeled pipe bends are loaded by in-plane opening moment and internal pressure, considering material models of elastic-perfectly-plastic (EPP) and strain-hardening (SH). The detailed finite element results show that the presence of initial imperfection has a pronounced impact on the plastic collapse moment. At the lower magnitude of applied pressure, the initial imperfection decreases collapse moment of deformed pipe bends significantly as compared to that of circular cross-sectioned pipe bends. At the higher pressure values, the negative effect of initial imperfection decreases with increased pressure for thinner pipe bends. Based on the results of the conducted finite element analyses, governing empirical equations are formulated to predict the collapse moments of pressurized 30° to 180° thin-walled pipe bends with more realistic cross-section employing EPP and SH models.



中文翻译:

初始变形的薄壁加压30的塑性分析 至180 平面内开口弯矩下的管道弯曲

本研究解决了广泛的非线性有限元分析的结果,该分析涉及从30°到180°的弯管配置范围内的多种几何谱,其中考虑了由弯曲制造过程引起的横截面的初始几何变形。通过合并初始椭圆度和多达20%的稀化/增稠(统称为初始几何缺陷),以逼真的,准确的横截面为模型模拟弯管。考虑到弹性完美塑性(EPP)和应变硬化(SH)的材料模型,通过弯管面内弯矩和内部压力对模型化的弯管施加载荷。详细的有限元结果表明,初始缺陷的存在对塑性塌陷矩有明显的影响。在较低的施加压力下,与圆形横截面弯管相比,初始缺陷可以显着降低变形弯管的坍塌力矩。在较高的压力值下,对于较薄的弯管,初始缺陷的负面影响会随着压力的增加而降低。根据进行的有限元分析的结果,使用EPP和SH模型,建立了控制经验方程式,以预测具有更实际横截面的加压30°至180°薄壁管弯头的坍塌力矩。

更新日期:2021-04-21
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