Measuring and testing – Testing by impact or shock – Specimen impactor detail
Patent
1990-07-30
1991-08-06
Raevis, Robert
Measuring and testing
Testing by impact or shock
Specimen impactor detail
73799, G01N 308
Patent
active
050366963
ABSTRACT:
A method for measuring fracture toughness of a brittle material is described which comprises the steps of impacting a sample of the material of preselected thickness and predetermined density and characteristic ultrasonic wave velocity C.sub.i at preselected velocity with a projectile of material having a known density and characteristic shock impedence corresponding to a predetermined characteristic ultrasonic wave velocity, determining the stress .sigma. at which the sample fractures upon impact of the projectile, and determining the fracture toughness of the sample as equal to 2.sigma.(c.sub.i t/.pi.)1/2, where t is the calculated time duration of a tensile pulse traveling the thickness of the sample.
REFERENCES:
patent: 4210028 (1980-07-01), Hildebrand
patent: 4413517 (1983-11-01), Soden
patent: 4418563 (1983-12-01), Kalthoff et al.
patent: 4522071 (1985-01-01), Thompson
patent: 4602511 (1986-07-01), Holt
"The Effect of Oriented Cracks on Seismic Velocities", D. L. Anderson et al, J. Geophys Res. 79:26, 4011-26 (Sep. 10, 1974).
"Seismic Velocities in Dry and Saturated Cracked Solids", by R. J. O'Connell, J. Geophys Res. 79:35, 5412-26 (Dec. 10, 1974).
"Dynamic Tensile Strength of Lunar Rock Types", by S. N. Cohn et al., J. Geophys Res., 86:B3, 1794-1802 (Mar. 10, 1981).
"Dynamic Rock Fragmentation", by Grady et al, Chap. 10, in Fracture Mechanics of Rock, Atkinson, et al, Academic Press (1987).
"Experimental Fracture Mechanics Data for Rocks and Minerals", by Atkinson et al, Chap. 11, in Fracture Mechanics of Rocks, Atkinson ed, Academic Press (1987).
Ahrens Thomas J.
Rubin Allan M.
Raevis Robert
Scearce Bobby D.
Singer Donald J.
The United States of America as represented by the Secretary of
LandOfFree
Method for measuring fracture toughness of brittle media does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method for measuring fracture toughness of brittle media, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for measuring fracture toughness of brittle media will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1979173