Abstract
Safety assessment of pipe with local wall thinning (LWT) at high temperature is highly important in power and nuclear engineering. Based on strain criterion and isochronous stress–strain curves at high temperature, this paper studied the ultimate creep load of pipe with LWT under creep condition by orthogonal experimental design and finite element numerical simulation. Firstly, the influence of LWT geometries was analyzed, which indicated that relative defect depth was the most significant factor to ultimate creep load. Secondly, the ultimate creep load formulas were regressed based on the ultimate creep loads of pipe with LWT at different creep times. And safety assessment curves for the pipe with LWT at high temperature by different strain criteria were proposed. Finally, the engineering method of allowable load of pipe with LWT by different strain criteria was constructed. The research results try to improve the safety assessment and structure integrity analysis of pipe with LWT at high temperature.
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