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首页> 外文期刊>Proceedings of the Institution of Mechanical Engineers. Part L, Journal of Materials: Design and Application >Determination of critical angle of circumferential throughwall crack for structurally distorted 90° pipe bends under bending moment with and without internal pressure
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Determination of critical angle of circumferential throughwall crack for structurally distorted 90° pipe bends under bending moment with and without internal pressure

机译：弯矩下弯矩下结构扭曲90°管道弯曲的周向通风裂缝的临界角度

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摘要

Throughwall circumferential cracks (TWC) in elbows can considerably minimize its collapse load when subjected to in-plane bending moment. The existing closed-form collapse moment equations do not adequately quantify critical crack angles for structurally distorted cracked pipe bends subjected to external loading. Therefore, the present study has been conducted to examine utilizing elastic-plastic finite element analysis, the influence of structural distortions on the variation of critical TWC of 90 degrees pipe bends under in-plane closing bending moment without and with internal pressure. With a mean radius (r) of 50 mm, cracked pipe bends were modeled for three different wall thickness, t (for pipe ratios of r/t = 5,10,20), each with two different bend radius, R (for bend ratios of R/r = 2,3) and with varying degrees of ovality and thinning (0 to 20% with increments of 5%). Finite element analyses were performed for two loading cases namely pure in-plane closing moment and in-plane closing bending with internal pressure. Normalized internal pressures of 0.2, 0.4, and 0.6 were applied. Results indicate the modification in the critical crack angle due to the pronounced effect of ovality compared to thinning on the plastic loads of pipe bends. From the finite element results, improved closed-form equations are proposed to evaluate plastic collapse moment of throughwall circumferential cracked pipe bends under the two loading conditions.
机译：在经过面内弯矩时，肘部中的通过壁的周向裂缝（TWC）可以显着降低其塌陷载荷。现有的闭合瞬间方程不充分量化对经受外部负荷的结构扭曲的裂纹管弯曲的临界裂缝角度。因此，已经进行了本研究，以利用弹性塑料有限元分析，结构扭曲对在平面内闭合弯矩下的90度管道弯曲的关键TWC的变化的影响而没有内部压力。对于50 mm的平均半径（R），裂纹管弯曲被建模为三个不同的壁厚，T（用于R / T = 5,10,20的管道比），每个弯曲半径r（用于弯曲） R / R = 2,3）的比率和不同程度的椭圆度和变薄（0至20％，增量为5％）。对两个装载情况进行有限元分析，即纯平面内闭合力矩和内部压力的面内闭合弯曲。施加归一化内部压力为0.2,0.4和0.6。结果表明，由于椭圆度的明显效果，与稀释管弯曲的塑料负荷相比，由于椭圆形的显着抗裂缝的修改。从有限元结果中，提出了改进的闭合方程，以评估在两个装载条件下通过墙体周向裂纹管弯曲的塑性塌陷力矩。

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