Fatigue Damage for Sweep-Sine and Random Accelerated Vibration Testing

• Main Authors: Vanja Pahor Kos, Janko Slavič, Miha Boltežar
• Format: Article
• Language: English
• Published: SAGE Publishing 2015-01-01
• Series: Advances in Mechanical Engineering
• Online Access: https://doi.org/10.1155/2014/340545

The vibration testing of components in the automotive industry requires long testing times and the use of expensive facilities. To shorten these testing times an accelerated vibration-testing approach is usually applied. This research tries to shorten these testing times by considering the parameters that define vibration-testing techniques. With special attention to the excitation types sweep-sine and random, a damage-based approach is applied. The phenomenon of fatigue damage is closely observed from the frequency-domain point of view but also by considering the relationship between the time and the frequency domains. The Palmgren-Miner cumulative rule is applied to calculate the fatigue life. Two case studies of measured responses are used to compare the times to failure. The results show that proposed predictions can be used to compare different testing techniques, but they are not so accurate when predicting the actual times to failure.