Review of empirical and semi-empirical Y factor solutions for cracked welded tubular joints

L. S. Etube, F. P. Brennan, W. D. Dover

Research output: Contribution to journalReview article

8 Citations (Scopus)

Abstract

The practical use of fracture mechanics has been established for use on large turbine and electric generator rotor components used in the atomic power generation and the aircraft industry. Application areas in the offshore industry have also been identified. Fracture mechanics is currently used at the design stage of offshore facilities. It provides the basis for fatigue life prediction, steel selection and tolerance setting on allowable weld imperfections. Fracture mechanics is also used during the operational stage of a structure to make important decisions on inspection scheduling and repair strategies and as a tool for establishing limits on operational conditions. Linear elastic fracture mechanics relies on the use of the stress intensity factor concept. The stress intensity factor is a very important fracture mechanics parameters. Therefore, the accuracy of any fracture mechanics model for the prediction of fatigue crack growth in offshore structures for example will depend very much on the accuracy of the stress intensity factor solution used. Several empirical and semi-empirical solutions have been developed over the years with varying degrees of accuracy. This paper presents a review of some of these methods and attempts to assess their accuracy in predicting Y factors for welded tubular joints by comparing predicted results with experimental data obtained from fatigue tests conducted on large scale welded tubular joints. The experimental results were conducted under simulated service conditions, using a jack-up offshore standard load history (JOSH). A comparison between the experimental and predicted results shows that there may be other factors, which influence fatigue crack growth under variable amplitude conditions. Some of these factors have been identified and discussed in this paper.

Original languageEnglish
Pages (from-to)565-583
Number of pages19
JournalMarine Structures
Volume12
Issue number9-10
DOIs
Publication statusPublished - 1 Dec 1999

Fingerprint

Fracture mechanics
Stress intensity factors
Fatigue crack propagation
Fatigue of materials
Electric generators
Jacks
Steel
Offshore structures
Turbogenerators
Power generation
Industry
Welds
Repair
Rotors
Inspection
Scheduling
Aircraft
Defects

Keywords

  • jack-up offshore standard load history (JOSH)
  • fracture mechanics
  • stress intensity factor
  • fatigue crack growth
  • welded tubular joints

Cite this

@article{0419539327bc49b6937540a7d20d0a80,
title = "Review of empirical and semi-empirical Y factor solutions for cracked welded tubular joints",
abstract = "The practical use of fracture mechanics has been established for use on large turbine and electric generator rotor components used in the atomic power generation and the aircraft industry. Application areas in the offshore industry have also been identified. Fracture mechanics is currently used at the design stage of offshore facilities. It provides the basis for fatigue life prediction, steel selection and tolerance setting on allowable weld imperfections. Fracture mechanics is also used during the operational stage of a structure to make important decisions on inspection scheduling and repair strategies and as a tool for establishing limits on operational conditions. Linear elastic fracture mechanics relies on the use of the stress intensity factor concept. The stress intensity factor is a very important fracture mechanics parameters. Therefore, the accuracy of any fracture mechanics model for the prediction of fatigue crack growth in offshore structures for example will depend very much on the accuracy of the stress intensity factor solution used. Several empirical and semi-empirical solutions have been developed over the years with varying degrees of accuracy. This paper presents a review of some of these methods and attempts to assess their accuracy in predicting Y factors for welded tubular joints by comparing predicted results with experimental data obtained from fatigue tests conducted on large scale welded tubular joints. The experimental results were conducted under simulated service conditions, using a jack-up offshore standard load history (JOSH). A comparison between the experimental and predicted results shows that there may be other factors, which influence fatigue crack growth under variable amplitude conditions. Some of these factors have been identified and discussed in this paper.",
keywords = "jack-up offshore standard load history (JOSH), fracture mechanics, stress intensity factor, fatigue crack growth, welded tubular joints",
author = "Etube, {L. S.} and Brennan, {F. P.} and Dover, {W. D.}",
year = "1999",
month = "12",
day = "1",
doi = "10.1016/S0951-8339(99)00033-7",
language = "English",
volume = "12",
pages = "565--583",
journal = "Marine Structures",
issn = "0951-8339",
number = "9-10",

}

Review of empirical and semi-empirical Y factor solutions for cracked welded tubular joints. / Etube, L. S.; Brennan, F. P.; Dover, W. D.

In: Marine Structures, Vol. 12, No. 9-10, 01.12.1999, p. 565-583.

Research output: Contribution to journalReview article

TY - JOUR

T1 - Review of empirical and semi-empirical Y factor solutions for cracked welded tubular joints

AU - Etube, L. S.

AU - Brennan, F. P.

AU - Dover, W. D.

PY - 1999/12/1

Y1 - 1999/12/1

N2 - The practical use of fracture mechanics has been established for use on large turbine and electric generator rotor components used in the atomic power generation and the aircraft industry. Application areas in the offshore industry have also been identified. Fracture mechanics is currently used at the design stage of offshore facilities. It provides the basis for fatigue life prediction, steel selection and tolerance setting on allowable weld imperfections. Fracture mechanics is also used during the operational stage of a structure to make important decisions on inspection scheduling and repair strategies and as a tool for establishing limits on operational conditions. Linear elastic fracture mechanics relies on the use of the stress intensity factor concept. The stress intensity factor is a very important fracture mechanics parameters. Therefore, the accuracy of any fracture mechanics model for the prediction of fatigue crack growth in offshore structures for example will depend very much on the accuracy of the stress intensity factor solution used. Several empirical and semi-empirical solutions have been developed over the years with varying degrees of accuracy. This paper presents a review of some of these methods and attempts to assess their accuracy in predicting Y factors for welded tubular joints by comparing predicted results with experimental data obtained from fatigue tests conducted on large scale welded tubular joints. The experimental results were conducted under simulated service conditions, using a jack-up offshore standard load history (JOSH). A comparison between the experimental and predicted results shows that there may be other factors, which influence fatigue crack growth under variable amplitude conditions. Some of these factors have been identified and discussed in this paper.

AB - The practical use of fracture mechanics has been established for use on large turbine and electric generator rotor components used in the atomic power generation and the aircraft industry. Application areas in the offshore industry have also been identified. Fracture mechanics is currently used at the design stage of offshore facilities. It provides the basis for fatigue life prediction, steel selection and tolerance setting on allowable weld imperfections. Fracture mechanics is also used during the operational stage of a structure to make important decisions on inspection scheduling and repair strategies and as a tool for establishing limits on operational conditions. Linear elastic fracture mechanics relies on the use of the stress intensity factor concept. The stress intensity factor is a very important fracture mechanics parameters. Therefore, the accuracy of any fracture mechanics model for the prediction of fatigue crack growth in offshore structures for example will depend very much on the accuracy of the stress intensity factor solution used. Several empirical and semi-empirical solutions have been developed over the years with varying degrees of accuracy. This paper presents a review of some of these methods and attempts to assess their accuracy in predicting Y factors for welded tubular joints by comparing predicted results with experimental data obtained from fatigue tests conducted on large scale welded tubular joints. The experimental results were conducted under simulated service conditions, using a jack-up offshore standard load history (JOSH). A comparison between the experimental and predicted results shows that there may be other factors, which influence fatigue crack growth under variable amplitude conditions. Some of these factors have been identified and discussed in this paper.

KW - jack-up offshore standard load history (JOSH)

KW - fracture mechanics

KW - stress intensity factor

KW - fatigue crack growth

KW - welded tubular joints

UR - http://www.scopus.com/inward/record.url?scp=0033303524&partnerID=8YFLogxK

U2 - 10.1016/S0951-8339(99)00033-7

DO - 10.1016/S0951-8339(99)00033-7

M3 - Review article

VL - 12

SP - 565

EP - 583

JO - Marine Structures

JF - Marine Structures

SN - 0951-8339

IS - 9-10

ER -