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Open AccessArticle

Influence of Pre-Stress Magnitude on Fatigue Crack Growth Behavior of Al-Alloy

1
Key Laboratory of Road Construction Technology and Equipment, MOE, Chang’an University, Xi’an 710064, China
2
Department of Civil Engineering, Beijing Forestry University, Beijing 100083, China
*
Author to whom correspondence should be addressed.
Materials 2018, 11(8), 1267; https://doi.org/10.3390/ma11081267
Received: 25 June 2018 / Revised: 18 July 2018 / Accepted: 21 July 2018 / Published: 24 July 2018
From tensile overload to shot peening, there have been many attempts to extend the fatigue properties of metals. A key challenge with the cold work processes is that it is hard to avoid generation of harmful effects (e.g., the increase of surface roughness caused by shot peening). Pre-stress has a positive effect on improving the fatigue property of metals, and it is expected to strength Al-alloy without introducing adverse factors. Four pre-stresses ranged from 120 to 183 MPa were incorporated in four cracked extended-compact tension specimens by application of different load based on the measured stress–strain curve. Fatigue crack growth behavior and fractured characteristic of the pre-stressed specimens were investigated systematically and were compared with those of an as-received specimen. The results show that the pre-stress ranged from 120 to 183 MPa significantly improved the fatigue resistance of Al-alloy by comparison with that of the as-received specimen. With increasing pre-stress, the fatigue life first increases, then decrease, and the specimen with pre-stress of 158 MPa has the longest fatigue life. For the manner of pre-stress, no adverse factor was observed for increasing fatigue property, and the induced pre-stress reduced gradually till to disappear during subsequent fatigue cycling. View Full-Text
Keywords: pre-stress magnitude; fatigue crack growth; Al-alloy; hardness pre-stress magnitude; fatigue crack growth; Al-alloy; hardness
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MDPI and ACS Style

Zhang, C.; Song, W.; Wang, Q.; Liu, W. Influence of Pre-Stress Magnitude on Fatigue Crack Growth Behavior of Al-Alloy. Materials 2018, 11, 1267.

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