NDLI: Results of the second round robin on opening-load measurement conducted by astm task group e24.04.04 on crack closure measurement and analysis

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Results of the second round robin on opening-load measurement conducted by astm task group e24.04.04 on crack closure measurement and analysis

Content Provider	NASA Technical Reports Server (NTRS)
Author	Phillips, E. P.
Copyright Year	1993
Description	A second experimental Round Robin on the measurement of the crack opening load in fatigue crack growth tests has been completed by the ASTM Task Group E24.04.04 on Crack Closure Measurement and Analysis. Fourteen laboratories participated in the testing of aluminum alloy compact tension specimens. Opening-load measurements were made at three crack lengths during constant Delta K, constant stress ratio tests by most of the participants. Four participants made opening-load measurements during threshold tests. All opening-load measurements were based on the analysis of specimens compliance behavior, where the displacement/strain was measured either at the crack mouth or the mid-height back face location. The Round Robin data were analyzed for opening load using two non-subjective analysis methods: the compliance offset and the correlation coefficient methods. The scatter in the opening load results was significantly reduced when some of the results were excluded from the analysis population based on an accept/reject criterion for raw data quality. The compliance offset and correlation coefficient opening load analysis methods produced similar results for data populations that had been screened to eliminate poor quality data.
File Size	1429321
Page Count	40
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19940017151
Archival Resource Key	ark:/13960/t04z06t1d
Language	English
Publisher Date	1993-11-01
Access Restriction	Open
Subject Keyword	Structural Mechanics Metal Fatigue Mean Correlation Coefficients Tensile Tests Aluminum Alloys Modulus of Elasticity Data Reduction Crack Closure Stress Ratio Crack Propagation Cracks Stress-strain Relationships Least Squares Method Standard Deviation Loads Forces Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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