. . . . "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." . "experimental-result" . . "Notation basis: Threshold value stated in the abstract." . "Cracks in silicon jump from rest to about 2 km/s; slower motion is forbidden" . "v_{\\mathrm{crack}} \\in \\{0\\} \\cup [v^{*}, \\dots),\\quad v^{*} \\approx 2\\ \\mathrm{km\\,s^{-1}}" . "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" . "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" . "Markus J. Buehler, Harvey Tang, Adri C. T. van Duin, William A. Goddard" . "2007"^^ . "doi:10.1103/physrevlett.99.165502" . "pmid:17995264" . "Threshold Crack Speed Controls Dynamical Fracture of Silicon Single Crystals" . . . "delphisci buehler-protein-materials claim extractor" . . . . "Claude Fable 5.1" . . . . . . . . . . . . "Quoted from the published abstract as returned by Europe PMC (2007-silicon-crack.abstract.txt, sha256 738b7efc8c80dd5d2f65952c2668e50f1e5caa3f191aa9d2a7309212a85418f7); the full text was not read (not in Europe PMC open-access subset). Checked by build/check.py." . . . "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." . . "738b7efc8c80dd5d2f65952c2668e50f1e5caa3f191aa9d2a7309212a85418f7" . "Checksum of the vendored text file inputs/2007-silicon-crack.abstract.txt, not of the publisher's copy." . . . "Abstract of Threshold Crack Speed Controls Dynamical Fracture of Silicon Single Crystals, as read" . . "buehler-protein-materials" . "2026-11-08T04:38:11.893Z"^^ . . . . . "Markus J. Buehler et al. 2007 claim: Cracks in silicon jump from rest to about 2 km/s; slower motion is forbidden" . . "RSA" . "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAyFHtPB6p0mCjDozxlOY9CmO3nBm7Te3jFbXyLmM+G1tGe47Da0jYIbhkl9Oo1ZjxmCa3LCwlEqK8gj6hEIcL4ahW30JXh9HycfKVk1bugkzMEV15tJdTzAU3sGMFnbNsn43xY2LFLy45tApkRm5byEiM7oRRrooIdwoQKnP4Wzq/bfAoJ9qvW+MGkelyOTd1jbSt+KfmT7xKmDfWzAHddUlWwMX2QJOLxDaffOteTop6ZRgPiNmPJKA/S62Gac9XtSYT3oDkZ6/nr5cxxNLpOyxTf5FPISiCe11xYO/unYjY+mwnOfA8yhJIyx1l0O9I0vpOpn+E5TvyHJV+oSTrvwIDAQAB" . "ahASYrqJ3+QoGgYQqESpO4g4Rvzz4sv+7ukn9w5g/a2lvQ8jmwZissTi651CNAgw5VDDqmIRoObduz2rIiUmzwL3/aqS4uoWFSGuQp63M7fjCjwebslcjFqu1wmga/yalj2/xo97ay1rKPIWOACCPiR+y9M8CMDe+1sLJuPhcXSWYDazGtAqAFRzbdc3bxU2RfUMCQmog8N/QZy39MR8O29PWcP7NlyVf8xMCY1fjsEpkgd1ccI32JOwiv/h85RbV8gt/qkd+/AbSFHBWOC3jCcXLFCM3PW0NqDSEwjYSidj5GmrtkqGKeruv08m5aAgaGzho3D1M0+uHdSO1RD6yg==" . . .