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      저자 : K.V. Anjusha (검색결과 1 건)
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        Prediction of fatigue crack initiation life in SA312 Type 304LN austenitic stainless steel straight pipes with notch

        A. Ramachandra Murthy,S. Vishnuvardhan,K.V. Anjusha,P. Gandhi,P.K. Singh 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.5

        In the nuclear power plants, stainless steel is widely used for fabrication of various components such aspiping and pipe fittings. These piping components are subjected to cyclic loading due to start up and shutdown of the nuclear power plants. The application of cyclic loading may lead to initiation of crack atstress raiser locations such as nozzle to piping connection, crown of piping bends etc. of the pipingsystem. Crack initiation can also take place from the flaws which have gone unnoticed duringmanufacturing. Therefore, prediction of crack initiation life would help in decision making with respectto plant operational life. The primary objective of the present study is to compile various analyticalmodels to predict the crack initiation life of the pipes with notch. Here notch simulates the stress raisersin the piping system. As a part of the study, Coffin-Manson equations have been benchmarked to predictthe crack initiation life of pipe with notch. Analytical models proposed by Zheng et al. [1], Singh et al. [2],Yang Dong et al. [25], Masayuki et al. [33] and Liu et al. [3] were compiled to predict the crack initiationlife of SA312 Type 304LN stainless steel pipe with notch under fatigue loading. Tensile and low cyclefatigue properties were evaluated for the same lot of SA312 Type 304LN stainless steel as that of pipe test. The predicted crack initiation lives by different models were compared with the experimental results ofthree pipes under different frequencies and loading conditions. It was observed that the predicted crackinitiation life is in very good agreement with experimental results with maximum difference of ±10.0%.

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