The effect of mean stress on fatigue crack propagation in half-inch (12.7 mm) thick specimens of aluminium alloys of high and low fracture toughness
✍ Scribed by S. Pearson
- Publisher
- Elsevier Science
- Year
- 1972
- Tongue
- English
- Weight
- 854 KB
- Volume
- 4
- Category
- Article
- ISSN
- 0013-7944
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✦ Synopsis
Experiments have been made to investigate the effect of mean stress on fatigue crack propagation in +in. (12.7mm) thick specimens of six aluminium alloys of high and low fracture toughness. The resuits are presented in terms of the stress intensity factor range, AK and the R value where R is the ratio of minimum to maximum stress. It was found that increasing R had little effect on the fatigue crack propagation rate for the alloy of very high fracture toughness (L64) but that for the other alloys the rate increased rapidly with increasing R at high values of AK. A simple law is proposed relating the fatigue crack propagation rate to AK, the R value and the fracture toughness of the material.