Prediction of low-cycle fatigue-life by acoustic emission—1: 2024-T3 aluminum alloy
✍ Scribed by J. Baram; M. Rosen
- Publisher
- Elsevier Science
- Year
- 1981
- Tongue
- English
- Weight
- 1008 KB
- Volume
- 15
- Category
- Article
- ISSN
- 0013-7944
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✦ Synopsis
Low-cycle fatigue tests were conducted by tension-tension until rupture, on a 2026T3 aluminum alloy sheet. Initial crack sizes and orientations in the fatigue specimens were found to be randomly distributed. Acoustic emission was continuously monitored during the tests. Every few hundred cycles, the acoustic signal having the highest peak-amplitude, was recorded as an extremal event for the elapsed period. This high peak-amplitude is related to a fast crack propagation rate through a phenomenological relationship. The extremal peak amplitudes are shown by an ordered statistics treatment, to be extremally distributed. The statistical treatment enables the prediction of the number of cycles left until failure. Predictions performed a posterion' based on results gained early in each fatigue test are in good agreement with actual fatigue lives. The amplitude distribution analysis.of the acoustic signals emitted during cyclic stress appears to be a promising nondestructive method of predicting fatigue life,