20.500.12556/RUL-159913 Frequency-dependent fatigue properties of additively manufactured PLA Vibration-fatigue failure occurs when a structure is dynamically excited within its natural frequency range. Unlike metals, which have constant fatigue parameters, polymers can exhibit frequency-dependent fatigue parameters, significantly affecting the vibration resilience of 3D-printed polymer structures. This manuscript presents a study utilizing a novel vibration-fatigue testing methodology to characterize the frequency dependence of polymer material fatigue parameters under constant temperature conditions. In this investigation, 3D-printed PLA samples with frequency-tunable geometry were experimentally tested on an electro-dynamical shaker with a random vibration profile. Using the validated numerical models, the estimation of vibration-fatigue life was obtained and compared to the experimental results. Performing the numerical minimization of estimated and actual fatigue lives, the frequency-dependent fatigue parameters were assessed. In particular, the results indicate that the tested samples exhibit varying fatigue parameters within the loading frequency range of 250–750 Hz. Specifically, as the loading frequency increases, the fatigue exponent increases and fatigue strength decreases. These findings confirm the frequency dependence of fatigue parameters for 3D-printed polymer structures, underscoring the necessity of experimental characterization to reliably estimate the vibration-fatigue life of 3D-printed polymer structures. The utilization of the introduced approach therefore enhances the vibration resilience of the 3D-printed polymer mechanical component. fatigue properties frequency dependence vibration-fatigue test high-frequency dynamic responses lastnosti utrujenosti frekvenčna odvisnost preskus vibracij preskus utrujenosti visokofrekvenčni dinamični odzivi true false true Angleški jezik Slovenski jezik Članek v reviji 2024-07-30 08:14:25 2024-07-30 08:14:30 2025-01-31 13:18:53 0000-00-00 00:00:00 2024 0 0 13 str. iss. 15, art. 2147 Vol. 16 2024 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 620.178.3 2073-4360 10.3390/polym16152147 203108099 polymers-16-02147.pdf polymers-16-02147.pdf 1 499DD5D9CE5B3137A4BD5F5FB6742C4C db2a2b33947404156a77b86471a980076b1c5933b476c48e181fa650a85acde2 95335997-d9d0-11ef-b232-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=198617 https://www.mdpi.com/2073-4360/16/15/2147 1 de023dec-4e3a-11ef-8f74-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=188145 Fakulteta za strojništvo 0 0 0