Physics
Scientific paper
Jun 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998georl..25.2205r&link_type=abstract
Geophysical Research Letters, Volume 25, Issue 12, p. 2205-2208
Physics
1
Structural Geology: Fractures And Faults, Structural Geology: Mechanics, Structural Geology: Microstructures, Physical Properties Of Rocks: Fracture And Flow
Scientific paper
Observations of strain-rate effects in brittle failure under compression have been interpreted as suggesting that sub-critical crack growth plays an important role in the deformation process. We suggest an alternate interpretation in which strain-rate effects are attributed to rate- and state-dependent friction along parent cracks. Using independently measured friction law parameters we demonstrate that a wing crack model incorporating state variable friction replicates the observed dependence of the stress-strain curve on applied strain rate. Model results are essentially equivalent to those of an earlier model incorporating sub-critical crack growth, suggesting that despite their different conceptual foundations, the validity of either model can not be determined on the basis of the observed strain-rate effects. However, only the rate-dependent friction model reproduces the observed unsteady growth of wing cracks.
Renshaw Carl E.
Schulson Erland M.
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