Abstract
Studying the crack propagation behavior of the thin-walled structure with long cracks is very significant for ensuring the safety of the airframe. The specimen and fixture of aluminum alloy wide plate was designed for fatigue crack propagation rate (da/dN) testing. The fatigue crack growth rate was tested for 2024-T3 and 7075-T6 aluminum alloy at elastic-plastic state. The relationship between the range of stress intensity factor (ΔK) or crack central line displacement (Δδ) and da/dn was discussed to describe the crack propagation behavior of aluminum alloy. The experimental results show that under medium-high loading, the long crack of wide plate grows quickly; the da/dN~ΔK curve turns obviously at this stage; the crack growth behavior cannot be expressed as Paris law. At the final stage, there is a linear relationship between Δδ and da/dn in the logarithm coordinate. The crack propagation behavior of aluminum alloy at elastic-plastic could be described by Δδ~da/dN curve.
| Original language | English |
|---|---|
| Pages (from-to) | 1218-1221+1227 |
| Journal | Beijing Hangkong Hangtian Daxue Xuebao/Journal of Beijing University of Aeronautics and Astronautics |
| Volume | 39 |
| Issue number | 9 |
| State | Published - Sep 2013 |
Keywords
- Aluminum alloy
- Centre line displacement
- Crack growth rate
- Elastic-plastic
- Stress intensity factor
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