Abstract
A series of vibration fatigue tests with the same initial stress amplitude were carried out on aluminum alloy 2024 cantilever beam aimed to explore the effect of excitation frequency on vibration fatigue lives. The experiment results show that the longest-life vibration fatigue of cantilever beam appears, and the least fatigue failure region of fracture surface is found, while the excitation frequency is equal to the natural frequency of sample. The fatigue fracture surface was studied by optical microscope and scanning electron microscope. The results show that the crack initiations mostly derive from the surface flaw or inclusion. The crack propagation regions are characterized by fatigue striation and secondary crack. There are lots of dimples in fatigue failure region of fracture surface. The tiny strengthening phase particles play a role of restraining the propagation of fatigue crack.
| Original language | English |
|---|---|
| Pages (from-to) | 78-83 |
| Number of pages | 6 |
| Journal | Hangkong Cailiao Xuebao/Journal of Aeronautical Materials |
| Volume | 33 |
| Issue number | 4 |
| DOIs | |
| State | Published - Aug 2013 |
Keywords
- Aluminum alloy 2024
- Fatigue fracture
- Natural frequency
- Vibration fatigue