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Threshold Crack Size in A Pyrolytic Carbon for no Growth Under Cyclic Stress

Published online by Cambridge University Press:  15 February 2011

M A Ling ,
George H. Sines  and
C. Barclay Gilpin
M A Ling
Affiliation:
Department of Materials Science and EngineeringUniversity of California, Los Angeles, CA 90095, USA
George H. Sines
Affiliation:
Department of Materials Science and EngineeringUniversity of California, Los Angeles, CA 90095, USA
C. Barclay Gilpin
Affiliation:
Department of Mechanical EngineeringCalifornia State University, Long Beach, CA 90840, USA
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Abstract

In this work, the fracture toughness of monolithic pyrolytic carbon and sandwich composites of this carbon on a graphite substrate were measured by a disk-shaped compact specimen and by using a tensile specimen. On this material, a large number of specimens that had small cracks induced by a Vickers diamond indenter were tested under cyclic stress. The existence of a true threshold stress intensity factor range for non-propagation of the cracks was demonstrated. Statistical confidence on pre-cracked specimens was obtained through testing a large number of specimens to a very long lifetime of the order of 109 cycles.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 383: Symposium I – Mechanical Behavior of Diamond and Other Forms of Carbon , 1995 , 273
Copyright
Copyright © Materials Research Society 1995

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