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In fracture experiments on single silicon crystals, once the critical load is reached the crack speed jumps from zero to about 2 km/s, so crack motion at lower speeds is forbidden, contradicting continuum theories that predict a continuously rising speed.
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Notation basis: Threshold value stated in the abstract.
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Cracks in silicon jump from rest to about 2 km/s; slower motion is forbidden
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v_{\mathrm{crack}} \in \{0\} \cup [v^{*}, \dots),\quad v^{*} \approx 2\ \mathrm{km\,s^{-1}}
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Markus J. Buehler et al., “Threshold Crack Speed Controls Dynamical Fracture of Silicon Single Crystals”, Physical Review Letters 99 (2007), doi:10.1103/physrevlett.99.165502; Abstract. Scope: Single-crystal silicon
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Markus J. Buehler, Harvey Tang, Adri C. T. van Duin, William A. Goddard. Threshold Crack Speed Controls Dynamical Fracture of Silicon Single Crystals. Physical Review Letters 99 (2007). doi:10.1103/physrevlett.99.165502
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Threshold Crack Speed Controls Dynamical Fracture of Silicon Single Crystals
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Fracture experiments of single silicon crystals reveal that after the critical fracture load is reached, the crack speed jumps from zero to approximately 2 km/sec, indicating that crack motion at lower speeds is forbidden.
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Abstract of Threshold Crack Speed Controls Dynamical Fracture of Silicon Single Crystals, as read
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Markus J. Buehler et al. 2007 claim: Cracks in silicon jump from rest to about 2 km/s; slower motion is forbidden
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