Mechanism of Fatigue Fracture of G105 Drill Pipe Material Under Different Conditions

The bending fatigue fracture properties of G105 drill pipe body materials and the influence of H sub(2) S corrosion and notch on the specimen bending fatigue performance were studied using the domestic PQ-6 type rotating bending fatigue testing machine. The fracture surfaces of smooth specimens, not...

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Bibliographic Details
Published inCai liao gong cheng = Journal of materials engineering Vol. 44; no. 2; pp. 107 - 114
Main Authors Huang, Ben-sheng, Chen, Xiang, Chen, Yong-bin, Li, Yong-bin
Format Journal Article
LanguageChinese
Published 20.02.2016
Subjects
Bending fatigue
Corrosion
Corrosion fatigue
Crack propagation
Drill pipe
Fatigue failure
Fatigue life
Notches
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Summary:The bending fatigue fracture properties of G105 drill pipe body materials and the influence of H sub(2) S corrosion and notch on the specimen bending fatigue performance were studied using the domestic PQ-6 type rotating bending fatigue testing machine. The fracture surfaces of smooth specimens, notched specimens and H sub(2) S corroded specimens were analyzed using metallographic microscope and scanning electron microscope. The results show that under the stress of smooth specimens' ultimate fatigue loading, the fatigue life of specimens corroded by H sub(2) S is same as that of notched specimens, declining from 10 super(6) to 10 super(4). The high stress concentration effect of notch can accelerate the process of fatigue crack nucleation in the notch specimen. The main role of H sub(2) S corrosion is that the hydrogen atoms will gather together at the inner defects, which will decrease the fatigue life. H sub(2) S corrosion and notch both can accelerate the propagation speed of the fatigue cracks. The main
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ISSN:1001-4381
DOI:10.11868/j.issn.1001-4381.2016.02.017