|Description / Abstract
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This test method covers the determination of the resistance to
fracture of metallic materials under
Mode I loading at static rates using any of the following notched and
precracked specimens: the
middle-cracked tension M(T) specimen, the compact tension C(T)
specimen, or the
crack-line-wedge-loaded C(W) specimen. A K-R curve is a continuous
record of toughness development
(resistance to crack extension) in terms of K(R) plotted against crack
extension in the specimen as
a crack is driven under an increasing stress intensity factor, K.
Materials that can be tested for K-R curve development are not limited
by strength, thickness, or
toughness, so long as specimens are of sufficient size to remain
predominantly elastic to the
effective crack extension value of interest.
Specimens of standard proportions are required, but size is variable,
to be adjusted for yield
strength and toughness of the materials.
Only three of the many possible specimen types that could be used to
develop K-R curves are covered
in this method.
The test is applicable to conditions where a material exhibits slow,
stable crack extension under
increasing crack driving force, which may exist in relatively tough
materials under plane stress
crack tip conditions.
The values stated in SI units are to be regarded as the standard. The
values given in parentheses
are for information only.
This standard does not purport to address all of the safety concerns,
if any, associated with its
use. It is the responsibility of the user of this standard to
establish appropriate safety and
health practices and determine the applicability of regulatory
limitations prior to use.
Footnote * - A Summary of Changes section appears at the end of this
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