Abstract
An elastic-plastic finite element analysis has been performed to solve the crack tip stress fields for three different crack lengths under tensile-compressive loading in 7049-UA Aluminum alloy. A redefined effective stress intensity factor range, △Keff′, incorporating the effect of the compressive stress, based on the finite element analysis results of the crack tip stress state, is proposed. Using this new parameter, the influence of the negative stress on the fatigue crack propagation rate under the cyclic tension-compression loading can be revalued quantitatively. A simple finite element method is introduced to predict the fatigue crack propagation rate under the negative stress ratio. The finite element calculated results has been used to correlate the published experimental data and good correlation has been obtained.
| Original language | English |
|---|---|
| Pages (from-to) | 122-127 |
| Number of pages | 6 |
| Journal | Jixie Qiangdu/Journal of Mechanical Strength |
| Volume | 31 |
| Issue number | 1 |
| State | Published - Feb 2009 |
Keywords
- Aluminum alloy
- Compressive loading
- Crack growth
- Elastic-plastic
- Fatigue
- Finite element analysis
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