Comparisons of Analytical Crack Closure Models and Experimental Results Under Flight Spectrum Loading

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Volume 1, Issue 8 (September 2004)

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ISSN: 1546-962X
Published Online: 30 August 2004
Page Count: 21

Comparisons of Analytical Crack Closure Models and Experimental Results Under Flight Spectrum Loading
McClung, RC
Senior Program Manager, Senior Research Engineer, and Research Engineer, Southwest Research Institute, TX

McMaster, FJ
Senior Program Manager, Senior Research Engineer, and Research Engineer, Southwest Research Institute, TX

Feiger, JH
Senior Program Manager, Senior Research Engineer, and Research Engineer, Southwest Research Institute, TX

(Received 29 May 2002; accepted 17 July 2003)

Abstract

Spectrum FCG data were generated with corner cracks at center holes for three contrasting spectrum types and two aluminum alloys, 2124-T851 and 7475-T7351. Existing strip-yield crack closure models for FCG analysis under spectrum loading were evaluated in comparison to conventional FCG models and enhanced as needed. Spectrum editing methods based on closure behavior were developed to reduce both computational and experimental time. FASTRAN was modified to address apparent differences in closure behavior between the surface and bore tips for compression-dominated spectra. Strip yield models successfully predicted FCG lives for contrasting spectra with a common constraint factor, unlike conventional models.

Keywords:
fatigue crack growth, aluminum alloys, crack closure, spectrum editing, fracture mechanics, constraint, compression, load interaction

Paper ID: JAI19041
DOI: 10.1520/JAI19041
ASTM International is a member of CrossRef.

Author Title Comparisons of Analytical Crack Closure Models and Experimental Results Under Flight Spectrum Loading Symposium Fatigue Testing and Analysis Under Variable Amplitude Loading Conditions, 2002-05-31 Committee E08

		Home Journals STPs Manuals Topics Subscriptions/Pricing Digital Library / Journals / Journal of ASTM International (JAI) / Citation Page Volume 1, Issue 8 (September 2004) Click here to download this paper now for $25 PDF (848K) View License Agreement ISSN: 1546-962X Published Online: 30 August 2004 Page Count: 21 Comparisons of Analytical Crack Closure Models and Experimental Results Under Flight Spectrum Loading McClung, RC Senior Program Manager, Senior Research Engineer, and Research Engineer, Southwest Research Institute, TX McMaster, FJ Senior Program Manager, Senior Research Engineer, and Research Engineer, Southwest Research Institute, TX Feiger, JH Senior Program Manager, Senior Research Engineer, and Research Engineer, Southwest Research Institute, TX (Received 29 May 2002; accepted 17 July 2003) Abstract Spectrum FCG data were generated with corner cracks at center holes for three contrasting spectrum types and two aluminum alloys, 2124-T851 and 7475-T7351. Existing strip-yield crack closure models for FCG analysis under spectrum loading were evaluated in comparison to conventional FCG models and enhanced as needed. Spectrum editing methods based on closure behavior were developed to reduce both computational and experimental time. FASTRAN was modified to address apparent differences in closure behavior between the surface and bore tips for compression-dominated spectra. Strip yield models successfully predicted FCG lives for contrasting spectra with a common constraint factor, unlike conventional models. Keywords: fatigue crack growth, aluminum alloys, crack closure, spectrum editing, fracture mechanics, constraint, compression, load interaction Paper ID: JAI19041 DOI: 10.1520/JAI19041 ASTM International is a member of CrossRef. Author Title Comparisons of Analytical Crack Closure Models and Experimental Results Under Flight Spectrum Loading Symposium Fatigue Testing and Analysis Under Variable Amplitude Loading Conditions, 2002-05-31 Committee E08