NDLI: Fracture toughness of brittle materials determined with chevron notch specimens

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Fracture toughness of brittle materials determined with chevron notch specimens

Content Provider	NASA Technical Reports Server (NTRS)
Author	Pierce, W. S. Bursey, R. T. Munz, D. Shannon Jr., J. L.
Copyright Year	1980
Description	The use of chevron-notch specimens for determining the plane strain fracture toughness (K sub Ic) of brittle materials is discussed. Three chevron-notch specimens were investigated: short bar, short rod, and four-point-bend. The dimensionless stress intensity coefficient used in computing K sub Ic is derived for the short bar specimen from the superposition of ligament-dependent and ligament-independent solutions for the straight through crack, and also from experimental compliance calibrations. Coefficients for the four-point-bend specimen were developed by the same superposition procedure, and with additional refinement using the slice model of Bluhm. Short rod specimen stress intensity coefficients were determined only by experimental compliance calibration. Performance of the three chevron-notch specimens and their stress intensity factor relations were evaluated by tests on hot-pressed silicon nitride and sintered aluminum oxide. Results obtained with the short bar and the four-point-bend specimens on silicon nitride are in good agreement and relatively free of specimen geometry and size effects within the range investigated. Results on aluminum oxide were affected by specimen size and chevron-notch geometry, believed due to a rising crack growth resistance curve for the material. Only the results for the short bar specimen are presented in detail.
File Size	1230693
Page Count	17
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19800023978
Archival Resource Key	ark:/13960/t3c010k4z
Language	English
Publisher Date	1980-01-01
Access Restriction	Open
Subject Keyword	Metallic Materials Specimen Geometry Stress Intensity Factors Plane Strain Silicon Nitrides Notch Tests Fracture Strength Brittle Materials Aluminum Oxides Crack Propagation Bars Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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