Fracture mechanics approach for evaluating fatigue life of butt welded joints: the effect of stress concentration

Ch H. Lin, S. H. Her

Research output: Contribution to conferencePaper

Abstract

The total fatigue life (Nf) is considered to be the sum of fatigue initial life (Ni) and propagation life (Np). In this study, the fatigue tests were carried out with the use of butt welded joints and base metal test specimens to evaluate Np. The growth rate(da/dN-ΔK) of embedded cracks in thickness direction did not agree with that in weld bead direction when nominal stress are adapted. This is attributed mainly to stress concentration effect arising from geometrical irregularities of weld reinforcement. The degree of the stress concentration affect growth rate and the proportion of Ni to Nf are discussed. Finally, referring to the test results, the size of initial flaw of butt welded joints is purposed.

Original languageEnglish
Pages39-44
Number of pages6
Publication statusPublished - 1998 Jan 1
EventProceedings of the 1998 8th International Offshore and Polar Engineering Conference. Part 3 (of 4) - Montreal, Can
Duration: 1998 May 241998 May 29

Other

OtherProceedings of the 1998 8th International Offshore and Polar Engineering Conference. Part 3 (of 4)
CityMontreal, Can
Period98-05-2498-05-29

Fingerprint

Fracture mechanics
Stress concentration
Welds
Fatigue of materials
Reinforcement
Cracks
Defects
Metals

All Science Journal Classification (ASJC) codes

  • Energy Engineering and Power Technology
  • Ocean Engineering
  • Mechanical Engineering

Cite this

Lin, C. H., & Her, S. H. (1998). Fracture mechanics approach for evaluating fatigue life of butt welded joints: the effect of stress concentration. 39-44. Paper presented at Proceedings of the 1998 8th International Offshore and Polar Engineering Conference. Part 3 (of 4), Montreal, Can, .
Lin, Ch H. ; Her, S. H. / Fracture mechanics approach for evaluating fatigue life of butt welded joints : the effect of stress concentration. Paper presented at Proceedings of the 1998 8th International Offshore and Polar Engineering Conference. Part 3 (of 4), Montreal, Can, .6 p.
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Lin, CH & Her, SH 1998, 'Fracture mechanics approach for evaluating fatigue life of butt welded joints: the effect of stress concentration', Paper presented at Proceedings of the 1998 8th International Offshore and Polar Engineering Conference. Part 3 (of 4), Montreal, Can, 98-05-24 - 98-05-29 pp. 39-44.

Fracture mechanics approach for evaluating fatigue life of butt welded joints : the effect of stress concentration. / Lin, Ch H.; Her, S. H.

1998. 39-44 Paper presented at Proceedings of the 1998 8th International Offshore and Polar Engineering Conference. Part 3 (of 4), Montreal, Can, .

Research output: Contribution to conferencePaper

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Lin CH, Her SH. Fracture mechanics approach for evaluating fatigue life of butt welded joints: the effect of stress concentration. 1998. Paper presented at Proceedings of the 1998 8th International Offshore and Polar Engineering Conference. Part 3 (of 4), Montreal, Can, .