电磁胀形对5052铝合金疲劳行为的影响
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| Published in: | 中国有色金属学报：英文版 Vol. 27; no. 6; pp. 1224 - 1232 |
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| Main Author: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2017
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| Subjects: | |
| Online Access: | Get full text |
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| Bibliography: | 43-1239/TG fatigue behavior; aluminum alloy; electromagnetic bulging; dislocation The effect of electromagnetic bulging on the fatigue behavior of the5052aluminum alloy was investigated throughtensile-tensile fatigue testing.The intriguing finding is that the bulged specimens exhibited enhanced fatigue strength as depicted bymaximum stress vs the number of cycles until failure(S-N)curves,by comparison with these original aluminum alloys.Althoughthe fatigue process of the original and budged alloys follows the same mechanism with three distinct steps,namely,crack initiation ata corner of the tested samples,stable crack propagation with typical fatigue striations and finally catastrophic fracture with dimplefractographic features.The typical crack propagation rate vs stress intensity factor range(da/dN-ΔK)curves derived from thespacing of striations reveal a lower crack propagation rate in the bulged specimens.The enhancement of fatigue strength inelectromagnetically bulged aluminum alloy is further rationalized in-depth on the basis of strain hardening and dislocation shieldingeffect. |
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| ISSN: | 1003-6326 |