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Open AccessArticle

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

Key Laboratory of Road Construction Technology and Equipment, MOE, Chang’an University, Xi’an 710064, China
Department of Civil Engineering, Beijing Forestry University, Beijing 100083, China
Author to whom correspondence should be addressed.
Materials 2018, 11(8), 1267;
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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