Analysis of automated fatigue crack growth rate data

Gary Marquis

Research output: Book/ReportReportProfessional

Abstract

Automated crack length measuring methods have largely replaced manual techniques in many applications. They require little operator time and have the additional feature of being able to collect large amounts of data. A method for compressing a large number of crack length observations into a smaller number of crack length estimates suitable for calculating the fatigue crack growth rate is described and verified using a simulation technique. With this method, the effective crack length measuring precision is improved and the amount of crack growth rate data obtainable from a single specimen is increased. Test times for threshold testing can also be potentially decreased. This method has been incorporated into a computer program, SÄRMÄ, currently in use in VTT Metals Laboratory.
Original languageEnglish
Place of PublicationEspoo
PublisherVTT Technical Research Centre of Finland
Number of pages33
ISBN (Print)951-38-4226-6
Publication statusPublished - 1992
MoE publication typeNot Eligible

Publication series

NameVTT Publications
PublisherVTT
No.108
ISSN (Print)1235-0621
ISSN (Electronic)1455-0849

Fingerprint

Fatigue crack propagation
Cracks
Computer program listings
Crack propagation
Testing
Metals

Keywords

  • fatigue (materials)
  • crack propagation
  • fatigue tests
  • cracks
  • length
  • measurement
  • automation
  • data reduction
  • data processing
  • data smoothing
  • calculations
  • computation
  • computer programs

Cite this

Marquis, G. (1992). Analysis of automated fatigue crack growth rate data. Espoo: VTT Technical Research Centre of Finland. VTT Publications, No. 108
Marquis, Gary. / Analysis of automated fatigue crack growth rate data. Espoo : VTT Technical Research Centre of Finland, 1992. 33 p. (VTT Publications; No. 108).
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abstract = "Automated crack length measuring methods have largely replaced manual techniques in many applications. They require little operator time and have the additional feature of being able to collect large amounts of data. A method for compressing a large number of crack length observations into a smaller number of crack length estimates suitable for calculating the fatigue crack growth rate is described and verified using a simulation technique. With this method, the effective crack length measuring precision is improved and the amount of crack growth rate data obtainable from a single specimen is increased. Test times for threshold testing can also be potentially decreased. This method has been incorporated into a computer program, S{\"A}RM{\"A}, currently in use in VTT Metals Laboratory.",
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Marquis, G 1992, Analysis of automated fatigue crack growth rate data. VTT Publications, no. 108, VTT Technical Research Centre of Finland, Espoo.

Analysis of automated fatigue crack growth rate data. / Marquis, Gary.

Espoo : VTT Technical Research Centre of Finland, 1992. 33 p. (VTT Publications; No. 108).

Research output: Book/ReportReportProfessional

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N2 - Automated crack length measuring methods have largely replaced manual techniques in many applications. They require little operator time and have the additional feature of being able to collect large amounts of data. A method for compressing a large number of crack length observations into a smaller number of crack length estimates suitable for calculating the fatigue crack growth rate is described and verified using a simulation technique. With this method, the effective crack length measuring precision is improved and the amount of crack growth rate data obtainable from a single specimen is increased. Test times for threshold testing can also be potentially decreased. This method has been incorporated into a computer program, SÄRMÄ, currently in use in VTT Metals Laboratory.

AB - Automated crack length measuring methods have largely replaced manual techniques in many applications. They require little operator time and have the additional feature of being able to collect large amounts of data. A method for compressing a large number of crack length observations into a smaller number of crack length estimates suitable for calculating the fatigue crack growth rate is described and verified using a simulation technique. With this method, the effective crack length measuring precision is improved and the amount of crack growth rate data obtainable from a single specimen is increased. Test times for threshold testing can also be potentially decreased. This method has been incorporated into a computer program, SÄRMÄ, currently in use in VTT Metals Laboratory.

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KW - crack propagation

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KW - cracks

KW - length

KW - measurement

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KW - data reduction

KW - data processing

KW - data smoothing

KW - calculations

KW - computation

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Marquis G. Analysis of automated fatigue crack growth rate data. Espoo: VTT Technical Research Centre of Finland, 1992. 33 p. (VTT Publications; No. 108).