Abstract
The effect of ovality and variable wall thickness on the collapse load of pipe bends subjected to in-plane opening moment is investigated using Finite Element (FE) analysis for an elastic plastic material. The collapse load was estimated from the moment-rotation curves using Twice-Elastic-Slope method. The presence of ovality reduced the collapse load by 13.1% for a model having bend characteristic 0.1, thus making its effect critical. The presence of thinning had no significant effect on the collapse load. Based on the FE results, a mathematical equation is proposed to estimate the collapse load of strain-hardened pipe bends for a range of bend characteristic from 0.1 to 0.6, considering the effect of ovality.
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