NDLI: Results of the 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 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, Edward P.
Copyright Year	1989
Description	An experimental Round Robin on the measurement of the opening load in fatigue crack growth tests was conducted on Crack Closure Measurement and Analysis. The Round Robin evaluated the current level of consistency of opening load measurements among laboratories and to identify causes for observed inconsistency. Eleven laboratories participated in the testing of compact and middle-crack specimens. Opening-load measurements were made for crack growth at two stress-intensity factor levels, three crack lengths, and following an overload. All opening-load measurements were based on the analysis of specimen compliance data. When all of the results reported (from all participants, all measurement methods, and all data analysis methods) for a given test condition were pooled, the range of opening loads was very large--typically spanning the lower half of the fatigue loading cycle. Part of the large scatter in the reported opening-load results was ascribed to consistent differences in results produced by the various methods used to measure specimen compliance and to evaluate the opening load from the compliance data. Another significant portion of the scatter was ascribed to lab-to-lab differences in producing the compliance data when using nominally the same method of measurement.
File Size	1467977
Page Count	40
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19890015308
Archival Resource Key	ark:/13960/t5r837r4k
Language	English
Publisher Date	1989-05-01
Access Restriction	Open
Subject Keyword	Structural Mechanics Fatigue Tests Crack Opening Displacement Crack Tips Stress Intensity Factors Fatigue Materials Displacement Measurement Data Reduction Crack Closure Loads Forces Crack Initiation Crack Propagation 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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