FATIGUE BEHAVIOUR OF COPPER-BRAZED 316L STAINLESS STEEL

Jernej Kralj; Blaž Hanželič; Srečko Glodež; Janez Kramberger; Roman Satošek; Branko Nečemer

doi:10.17222/mit.2023.1036

Jernej Kralj University of Maribor, Faculty of Mechanical Engineering, Smetanova 17, 2000 Maribor, Slovenia
Blaž Hanželič University of Maribor, Faculty of Mechanical Engineering, Smetanova 17, 2000 Maribor, Slovenia
Srečko Glodež University of Maribor, Faculty of Mechanical Engineering, Smetanova 17, 2000 Maribor, Slovenia
Janez Kramberger University of Maribor, Faculty of Mechanical Engineering, Smetanova 17, 2000 Maribor, Slovenia
Roman Satošek Danfoss Trata d.o.o, Korenova 5, SI-1241 Kamnik, Slovenia
Branko Nečemer University of Maribor, Faculty of Mechanical Engineering, Smetanova 17, 2000 Maribor, Slovenia

DOI: https://doi.org/10.17222/mit.2023.1036

Keywords: plate heat exchanger, brazed joint, fatigue, experimental testing

Abstract

The plate heat exchanger (PHE) is a component that provides heat to be transferred from hot water to domestic cold water without mixing them with high efficiency. Over the lifetime of the PHE, cyclic pressure acts on the brazing points and the plates, and this may lead to fatigue failure. The fatigue behaviour of the PHE, designed by using copper-brazed 316L (also known as 1.4404) stainless steel, was investigated by performing fatigue tests to obtain the S-N curve of the analysed brazed joint. The fatigue tests have been performed on the Vibrophore 100 testing machine under the load ratio R = 0.1 for different values of calculated amplitude stress. Based on the obtained experimental results, an appropriate material model of the analysed brazed joint has been created, which was validated with numerical calculation in the framework of a program code Ansys. A validated material model can then be used for the subsequent numerical analysis of PHE.

References

[1] H. A. Zahid, Plate heat exchanger literature survey and new heat transfer and pressure drop correlations for refrigerant evaporators, Heat transferring engineering, 24 (2010), 3–16.
[2] Y. Gürler, Design and mechanical behaviour of brazed plate heat exchangers, MSc thesis, Izmir Institute of Technology, 2018.
[3] G. F. Hewitt, G. L. Shires, T. R. Bott, Process Heat Transfer, CRC Press, New York, 1994.
[4] Y. Mizokami, T. Igari, F. Kawashima, N. Sakakibara, M. Tanihira, T. Yuhara, T. Hiroe, Development of structural design procedure of plate-fin exchangers for HTGR, Nuclear engineering and design, 255 (2013), 248–262.
[5] J. Kralj, Mechanical characterisation of brazed joints of heat exchanger, MSc thesis, University of Maribor, Faculty of Mechanical Engineering, 2023.
[6] M. P. Groover, Fundamentals of Modern Manufacturing, New Jersey: John Wiley & Sons, 2010.
[7] J. Kowalewski, J. Szczurek, Issues in vacuum brazing, ASM International, Dallas, 2006.
[8] M. M. Schwartz, Brazing, ASM International, Ohio, 2003
[9] K. Takeshita, Y. Terakura, A novel approach for predicting the tensile strength of brazed joints, Metallurgical and materials transactions A, 29 (1998), 587–592.
[10] V. Fedorov, T. Uhlig, G. Wagner, Investigation of fatigue damage in aluminium/stainless steel brazed joints, Welding in the world, 62 (2018), 609 – 616.
[11] Y. Hayta, Investigation of the fatigue behaviour of metallic components used in plate heat exchangers under variable dynamic loads. Graduate School of Engineering and Science of Izmir Institute of Technology, 2020.
[12] Zwick / Roel. Product Information. Available at: https://www.zwickroell.com/fileadmin/content/Files/SharePoint/user_upload/PI_EN/13_890_Vibrophore_100_PI_EN.pdf [24.09.2023]
[13] A. Petrik, R. Aroch, Usage of true stress – strain curve for FE simulation and the influencing parameters. IOP Conference Series Materials Science and Engineering, 566 (1), (2019), 2025.
[14] K. Hyeong, K. J. Weon, S. Ohseop, O. Dongho, Determination of true stress – strain curve of type 304 and 316 stainless steels using a typical tensile test and finite element analysis, Nuclear Engineering and Technology, (2021), 647 – 656.
[15] O. Gyojo, Effective stress and fatigue life prediction with mean stress correction models on a ferritic stainless-steel sheet, International Journal of Fatigue, 157, (2022), 106707.
[16] S. Kwofie, An exponential stress function for predicting fatigue and life due to mean stresses. International Journal of Fatigue, 23, (2001), 829 – 836.
[17] ME 304 Finite Element Analysis Basic types of FEA Elements. Available at: https://faculty.up.edu/lulay/ME304/ANSYS-BasicElements-line-2D-3D.pdf [25.9.2023]
[18] C. Xiaolin, L. Yijun, Finite Element Modeling and Simulation with ANSYS Workbench. CNC Press, 2019.