PSI - Issue 76

Filip Likavčan et al. / Procedia Structural Integrity 76 (2026) 145– 150

150

The result is an assessment of the fatigue strength of bicycle frames for specific operating conditions, which will differ in the frequency of occurrence of individual dynamic amplitudes and the sources of these dynamic components.This means more frequent occurrence of dynamic phenomena from overcoming terrain irregularities,obstacles and jumps for mountain bike frames and, conversely, their absence in the load spectrum for city bike frames. 4. Conclusions The paper identifies specific features in assessing the fatigue strength and service life of bicycle frames: • Using of multiple manufacturing technologies in frame production • Fatigue life assessment of welds • Effect of geometric inaccuracy on fatigue life • Multi-axial stress state A methodology is proposed for identifying effective dynamic multipliers and an experimental-computational procedure for compiling a load spectrum for a bicycle frame depending on its intended use, e.g., city bike, mountain bike, off-road bike, etc.In the next step, this methodology needs to be applied to specific frame cases and numerical values of stress amplitude load spectra. References [1] MARGETIN, M.; CHMELKO, V.; ŠULKO, M.; ĎURKA, R.; KOŠČO, T. Fatigue Lifetime Analysis of a Bicycle Frame Made by Additive Manufacturing Technology from AlSi10Mg, Metals 2022, 12, 1277 [2] LUO, A., A., KUBIC, R., C., TARTAGLIA, J., M., Microstructure and Fatigue Properties of Hydroformed Aluminum Alloys 6063 and 5754, Metallurgical and materials transactions A, 2003 [3] ABOOD, A. N., SALEH, A. H., ABDULLAH, Z. W.: Effect of Heat Treatment on Strain Life of Aluminum Alloy AA 6061, Journal of Materials Science Research; Vol. 2, No. 2, ISSN 1927-0585, 2013 [4] LIU, K., MIRZA, F. A., CHEN, X. G.: Effect of Overaging on the Cyclic Deformation Behavior of an AA6061 Aluminum Alloy, Department of Applied Sciences, University of Québec, 2018 [5] PISAPIA, A., NASTRI, E., PILUSO, V., FORMISANO, A., MAZZOLANI, F. M.: Experimental campaign on structural aluminium alloys under monotonic and cyclic loading, Engineering Structures, Vol. 282, 115836, 2023 [6] HONG, T., DING, F., CHEN, F., ZHANG, H., ZENG, Q., WANG, J.: Mechanical Properties of 6061 Aluminum Alloy under Cyclic Tensile Loading, Crystals, 13, 1171, 2023 [7].Tuma, J. Vehicle Gearbox Noise and Vibration: Measurement, Signal Analysis, Signal Processing and Noise Reduction Measures; Wiley: Hoboken, NJ, USA, 2014. [CrossRef] [8] Chmelko, V.; Margetin, M.; Zetková, I.; Norek, M.; Likavčan, F. Analysis of Static and Cyclic Properties of 316L and AlSi10Mg in Conventional Casting and Additive Manufacturing. Materials 2024, 17, https://doi.org/10.3390/ma17235861 [9] NOWELL, D., SAHADI CAVALHEIRO, J. V.: Approaches to fatigue life prediction under multiaxial loading, MATEC Web of Conferences 300, 02001, 2019 [10] ENGIN, Z., COKER, D.: Comparison of Equivalent Stress Methods with Critical Plane Approaches for Multiaxial High Cycle Fatigue Assessment, 2nd International Conference on Structural Integrity, ICSI, 2017 [11] Chmelko V, Margetin M. The performance of selected multiaxial criteria under tension/torsion loading conditions. Int J Fatigue. 2020;135:105532.