For reliability-based design of pipe bends and elbows, a probabilistic characterization of the primary stress indices ( and ) is essential. This paper aims at the characterization of the fabrication/geometric uncertainty in , for thin stainless steel long radius pipe bends, subjected to in-plane opening moment. This characterization is performed in a framework based on Monte Carlo simulation and nonlinear finite element analysis. A revision of the code-based expression for is proposed where a random variable K replaces the constant numerator in this expression. The statistics for K are provided for different pipe nominal dimensions, which indicates that the existing provision gives a very conservative estimate of the plastic collapse moment for pipe bends subjected to in-plane opening flexure.
Fabrication Uncertainty in for Nuclear Pipe Bends Subjected to In-Plane Opening Moment
Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received May 24, 2011; final manuscript received August 7, 2012; published online December 5, 2012. Assoc. Editor: Somnath Chattopadhyay.
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Roy, P., and Ghosh, S. (December 5, 2012). "Fabrication Uncertainty in for Nuclear Pipe Bends Subjected to In-Plane Opening Moment." ASME. J. Pressure Vessel Technol. February 2013; 135(1): 011402. https://doi.org/10.1115/1.4007470
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