Abstract
The dependence of G c on crack velocity in single-groove double cantilever beams (SG DCB) is negligible over the range of crack velocities from 0.2 to 1100 in. min−1. The constancy of G c appears to reflect a counterbalancing of the rise in yield stress by a decrease in crack opening displacement. The latter occurs through a decrease in the “gauge length” of material engulfed by yielding rather than by a decrease in the ultimate plastic strain in the crack tip plastic zone. The energy of shear lip formation at any crack velocity appears to be accurately estimated from G c's for SG DCB specimens fractured at low velocity.
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References
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Kambour, R.P., Miller, S. Gc versus crack velocity in single groove double cantilever beam specimens of polycarbonate. J Mater Sci 11, 1220–1226 (1976). https://doi.org/10.1007/BF00545139
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DOI: https://doi.org/10.1007/BF00545139