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首页> 外文会议>ASME(American Society of Mechanical Engineers) Pressure Vessels and Piping Conference 2006 vol.3: Design and Analysis >DETERMINATION OF C_2 STRESS INDEX OF BACK-TO-BACK WELDED PIPING BENDS USING FINITE ELEMENT METHOD
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DETERMINATION OF C_2 STRESS INDEX OF BACK-TO-BACK WELDED PIPING BENDS USING FINITE ELEMENT METHOD

机译：有限元法确定背对背焊接管的C_2应力指标

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摘要

In current ASME Boiler and Pressure Vessel Code, the C_2 stress index for back-to-back elbows welded together is taken as the product of the C_2 index of the elbow and the C_2 index of the girth butt weld. In recent years, many finite element analyses studies have been conducted on the elbow C_2 index itself which have found that the code C_2 value is conservative. The girth butt weld C_2 given in the code resulted from analytical studies on transition joint between two straight pipes. While the code considers that the secondary stress due to the weld reinforcement including the effect from the mismatch to be small and practically negligible for a thick pipe, it recommends a formula to calculate C_2 for weld in a thin pipe of thickness less than 0.237". The purpose of this paper is to present an approach that C_2 caused by weld mismatch can be determined by finite element analysis. Back-to-back bends are modeled with 2 typical configurations: in-plane and out-of-plane. Parametric studies of linear elastic secondary stresses are carried out to determine the "worst possible" two bend central line mismatch. The stress indices at elbows and weld location are established. It is found that the C_2 index based on the code formula is overly conservative for back-to-back welded pipe bends and the multiplication by the C_2 index of the weld is not needed. Key Words: C_2 stress indices, Girth Butt Weld, Pipe Bend, Finite Elements Analysis.
机译：在当前的ASME锅炉和压力容器规范中，将焊接在一起的背对背弯头的C_2应力指数作为弯头的C_2指数和对接焊缝的C_2指数的乘积。近年来，对肘C_2指数本身进行了许多有限元分析研究，发现代码C_2的值是保守的。规范中给出的环缝对接焊缝C_2是对两个直管之间的过渡缝进行分析研究得出的。虽然该规范认为，由焊接补强引起的次级应力（包括不匹配的影响）很小，并且对于厚管几乎可以忽略不计，但建议使用公式来计算厚度小于0.237英寸的薄管的焊接C_2。本文的目的是提出一种可以通过有限元分析确定由焊接失配引起的C_2的方法，用两种典型的配置对背对背弯曲进行建模：面内和面外。通过线性弹性二次应力的确定，确定“最坏的”两个弯曲中心线的不匹配，建立了弯头和焊接位置的应力指数，发现基于代码公式的C_2指数对于回归而言过于保守不需要焊接后弯管，也不需要与焊缝的C_2指数相乘关键词：C_2应力指数，对接焊缝，弯管，有限元分析。

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