Affiliation:
1. Faculty of Mechanical Engineering and Naval Architecture, University of Zagreb, Ivana Lučića 5, Zagreb, Croatia
Abstract
The focus of this paper is on compression fatigue life in welded test specimen. Considered test specimen is highly complex due to multi-layer welding and production errors affecting its topology. Test specimen is made from S355 steel which is used for both base material and weld. Compression fatigue analysis is seldom performed as compression positively affects fatigue life. At the same time, during MAG welding residual stresses affect the fatigue life, decreasing it significantly. Finite element method (FEM) is applied to estimate compression fatigue life of the welded test specimen and obtained fatigue curve is compared to the experimental curve. Experimental curves are given for different stress ratios: R= -1, and R= - ∞. Analysis consists of thermal and structural analysis using FEM method and fatigue analysis which is based on FEM results. FEM thermal simulation of welding with constant initial temperature is performed first and followed by nonlinear structural analysis for assessment of the residual stresses due to heat expansion. Fatigue parameters are determined using Universal slope method.
Publisher
Association for Promotion and Development of Maritime Industries
Reference21 articles.
1. Lietaert, K., Cutolo, A., Boey, D. & Van Hooreweder, B. (2018) Fatigue life of additively manufactured Ti6Al4V scaffolds under tension-tension, tension-compression and compression-compression fatigue load. Scientific Reports. 8, 4957. Available at: https://doi.org/10.1038/s41598-018-23414-2 [Accessed on 16. March. 2021].
2. Dev, A. & Saha, M. (2017) Ship Repairing Time and Labour. MARTECH 2017; 12th Biennial International Conference and Exhibition Towards 2030: Maritime Sustainability through People and Technology. Available at: https://ssrn.com/abstract=3753689 [Accessed on 16. March. 2021].
3. Friedrich, N. (2021) Approach to consider welding residual stresses in fatigue analysis using numerical simulations. Ph. D. Technischen Universität Hamburg.
4. Freidrich, N. & Ehlers, S. (2018) Fatigue life prediction of welds for different stress ratios R. Marstruct. Available at: http://www.marstruct-vi.com/marstruct2021/structure.aspx [Accessed on 3. March 2020].
5. Schajer, G. S. & Whitehead, P. S. (2018) Hole-Drilling Method for Measuring Residual Stresses. Synthesis SEM Lectures on Experimental Mechanics. Available at: https://doi.org/10.2200/S00818ED1V01Y201712SEM001 [Accessed on 20. March. 2021].