Method for determining plane strain fracture toughness of non-elastic fracture mechanics specimens
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United States of America Patent
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Nov 10, 1981
Grant Date -
N/A
app pub date -
Mar 19, 1979
filing date -
Mar 19, 1979
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention involves a new method for measuring plane strain fracture toughness (K.sub.Ic) of a somewhat non-elastic material uniquely suitable for use on specimens that are smaller than have formerly been required for performing valid K.sub.Ic tests. The present invention involves selecting a short-rod specimen configuration in which the specimen material at a crack front or tip therein would be constrained during loading to a plane strain state and, from the measurement and anelastic analysis of a load-displacement curve that includes at least two unloading slopes the energy per unit crack area that is required to slowly advance a steady state crack can be determined, which data, along with measurement of the critical load when the crack passes through a known location, and considering the specimen geometry, is used to determine the fracture toughness, K.sub.Ic, of the specimen.
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