Acceleration factor and experimental validation of aluminum alloy under
narrow-band random excitation
Abstract
In order to reduce the vibration fatigue test time of aeronautical
engineering components made of aluminum-alloy, a random vibration
fatigue acceleration model under narrow-band excitation is proposed in
this paper. A three-parameter S- N curve is adopted to
consider the effect of small stress response, while a scale factor
α is introduced to consider the effect of stress distribution.
The random vibration fatigue tests of 2024-T3 and 7075-T6 aluminum-alloy
specimens with elliptical holes are performed, where the vibration
fatigue lives of load spectra with the same bandwidth and different
excitation acceleration levels are obtained. The test results show that
the proposed model is in sound agreement with the test results.