Prediction of Fatigue Life for the Take-over Weld Structure of the Molten Salt Tank in the Solar Thermal Device
Through having ASME BPVC.Ⅷ.2-2019 standard-based equivalent structural stress method adopted and ABAQUS software employed,the fatigue life of the take-over weld of the heater sleeve in a specific trough-type solar thermal device's low-temperature molten salt tank was predicted.Considering the liquid level's day-night variation in the low-temperature molten salt tank,six typical fatigue conditions and loads were determined though the rain flow counting method.In addition,a numerical analysis model for the structure of the heater sleeve's take-over weld was established and ABAQUS software was employed to simulate stress distribution there under the maximum load,including having FE-safe module utilized to cal-culate its fatigue life under six different loads and having the Miner linear damage accumulation theory based to predict the fatigue life under the coupling effect of multiple working conditions.The results show that the stress at the welding toe can be evaluated by stress evaluation and it meets the standard require-ments.The fatigue life of the toe is 10 964 times under the most demanding working condition(working condition 1),and the first failure position stays at the upper right position of the toe(θ≈40°).The take-over weld's fatigue life under the coupling action of each working condition is 64 years.
molten salt tanktake-over weldequivalent structural stressfatigue lifefinite element
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