Discrepancies of fatigue crack growth behaviour of API X65 steel

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

This paper discusses the fatigue life behaviour of the API X65 steel tested under constant amplitude loading in ambient temperature. The influence of repeated loading at a particular stress ratio would favour the initiation of fatigue cracks that would consequently affect the fatigue crack growth. The main objective of this paper is to evaluate the load ratio effects on fatigue crack growth rate, taking into account their statistical characteristics. The fatigue crack growth test was carried out using compact-tension specimen at different load ratios of 0.1, 0.4 and 0.7. The experimental results showed the crack growth rate was dependent on the applied load. It was observed that the load ratio effect was less significant in stable crack growth regions. The result was consistent with the multiple regression test obtained by the least square method at a significance level of 0.05. The empirical model of Paris and Walker was utilised to evaluate the effects of load ratio on the fatigue crack growth rates. The approximation of fatigue life lies between 10-25 % of error using conservative model and 6 % error using the Walker model. The experimental data was scattered within a factor-of-2 correlation line suggesting that the accuracy of the experimental data towards the estimated values was high.

Original languageEnglish
Pages (from-to)4719-4726
Number of pages8
JournalJournal of Mechanical Science and Technology
Volume31
Issue number10
DOIs
Publication statusPublished - 1 Oct 2017

Fingerprint

Fatigue crack propagation
Application programming interfaces (API)
Steel
Crack propagation
Fatigue of materials
Temperature

Keywords

  • API X65 steel
  • Crack growth
  • Effect of stress ratio
  • Fatigue

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Discrepancies of fatigue crack growth behaviour of API X65 steel. / Mansor, N. I.I.; Abdullah, Shahrum; Mohd Ihsan, Ahmad Kamal Ariffin.

In: Journal of Mechanical Science and Technology, Vol. 31, No. 10, 01.10.2017, p. 4719-4726.

Research output: Contribution to journalArticle

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