Local thermal effect on the growth rate of fatigue crack

Chung-Hung Lin, J. W. Sheu, D. M. Lee

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

The retardation of fatigue crack caused by crack tip local heating was studied. Steady fatigue crack growth under constant amplitude loading would be disturbed by the sudden change in plastic zone size resulting from a single overload. However, mechanical properties of metal, such as yielding stress, Young's modulus, etc., may vary with increasing temperature. From this consideration, the fatigue crack tip plastic zone size can be altered by locally changing the mechanical properties of this area. In order to understand the thermal effect on the retardation of fatigue crack, constant amplitude fatigue propagation tests were carried out using A5083P-O aluminum alloy specimens. Tests were performed under identical applied load, but with different levels of heat input. The a-N curves were recorded to compare the degree of retardation, and the variation in crack tip opening was recorded with CCD camera. The results show that the crack growth rate was reduced, when the level of heat input to crack tip was increased. Additionally, the distribution of stress during loading and heating was calculated by FE methodology. The result shows that temperature increase at the crack tip would cause the residual compressive stress, which is believed to be responsible for the retardation of fatigue growth.

Original languageEnglish
Title of host publicationProceedings of the 1999 Ninth International Offshore and Polar Engineering Conference (Volume 4), Brest, France, 30 May - 4 June 1999
EditorsP Grundy, J Koo, I Langen, Y Ueda, P Grundy, J Koo, I Langen, Y Ueda
PublisherInternational Society of Offshore and Polar Engineers
Pages195-198
Number of pages4
ISBN (Print)1880653435
Publication statusPublished - 1999 Dec 1
EventProceedings of the 1999 Ninth International Offshore and Polar Engineering Conference - Brest, France
Duration: 1999 May 301999 Jun 4

Other

OtherProceedings of the 1999 Ninth International Offshore and Polar Engineering Conference
CountryFrance
CityBrest
Period99-05-3099-06-04

All Science Journal Classification (ASJC) codes

  • Earth and Planetary Sciences(all)
  • Engineering(all)
  • Environmental Science(all)

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  • Cite this

    Lin, C-H., Sheu, J. W., & Lee, D. M. (1999). Local thermal effect on the growth rate of fatigue crack. In P. Grundy, J. Koo, I. Langen, Y. Ueda, P. Grundy, J. Koo, I. Langen, & Y. Ueda (Eds.), Proceedings of the 1999 Ninth International Offshore and Polar Engineering Conference (Volume 4), Brest, France, 30 May - 4 June 1999 (pp. 195-198). International Society of Offshore and Polar Engineers.