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Thermal and Structural Analysis of Stainless Steel 304 for Thermal Fatigue Testing Using ANSYS


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DOI: https://doi.org/10.15866/ireme.v8i6.4589

Abstract


Thermal stresses are important part of consideration while designing the pressure vessels, piping systems of a nuclear power plant. Thermal fatigue in piping of reactor coolant system caused by thermo-mechanical cyclic stresses results in cracks in the piping. The main objective of this study is to analyze and induce optimum stresses in the pipe specimen within minimum cycles. The heating and cooling cycles will be carried out on the pipe specimen to induce thermal stresses. Transient thermal analysis of stainless steel (SS) 304 pipe specimen has been carried out for various cases using Finite Element Analysis (FEA) using ANSYS. The heating and cooling cycles on the specimen have been carried out with various cases including variations in the parameters like heating and cooling time duration, convection heat transfer coefficient and heat flux. The results from the transient thermal analysis are further used for calculating the thermal stresses due to the thermal gradients generated by the heating and cooling cycles using ANSYS. The stress range for different cases are different and are used to calculate the estimated fatigue life of the specimen using the low cycle fatigue mean curve equation for SS 304.
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Keywords


Stainless Steel 304; Transient Thermal Analysis; Thermal Stress; Low Cycle Fatigue; FEA

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