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Maximum crack velocity of approximately 800 m/s is measured before initiation of crack branching.
Wallner lines, which result from the interaction between the propagating crack front and shear waves emanating from a secondary source, were observed on the fracture surface and geometric analysis of them indicates that the maximum crack velocity is ∼800 m s−1, which corresponds to ∼0.32 times the shear wave speed.
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Under high loading rates, the crack propagates with slightly decreasing velocity, though the maximum crack speed reached up to 20.6% of the Rayleigh wave speed of the tested HSC.
Under dynamic compression, we show that the simulated peak strength is sensitive to the maximum crack growth velocity and the flaw distribution, while the stress collapse portion of the test is partially influenced by the granular flow behavior of the fully damaged material.
The data fit to the obtained relation of ln time to failure) versus maximum applied stress was very reasonable and compares well with that of the more widely utilized power-law crack velocity.
b Maximum crack widths.
The C-level is the minimum local crack velocity that we have in a velocity cluster.
The crack velocity increased with increasing the stress intensity factor.
Eight maximum crack opening displacement levels were tested in total.
For the residual maximum crack width, the shear crack width is not smaller than the flexural crack width in this experiment.
Maximum crack opening displacement at the crack-tip for which the cohesive stress becomes equals to zero.
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