TY - JOUR
T1 - Dynamic instabilities in {1 1 1} silicon
AU - Sherman, D.
AU - Markovitz, M.
AU - Barkai, O.
N1 - Funding Information:
This research was supported by the Israel Science Foundation (ISF) under Grant No. 1110/04. I. Gavish is acknowledged for her contribution to the experimental work.
PY - 2008/2
Y1 - 2008/2
N2 - The phenomena occurring during rapid crack propagation in brittle single crystals was studied by cleaving strip-like silicon specimens along the {1 1 1} low-energy cleavage plane under bending. The experiments reveal phenomena associated with rapid crack propagation in brittle single crystals not previously reported, and new crack path instabilities in particular. In contrast to amorphous materials, the observed instabilities are generated at relatively low velocity, while at high velocity the crack path remains stable. The experiments demonstrate that crack velocity in single crystals can attain the theoretical limit. No evidence for mirror, mist, and hackle instabilities, typical in amorphous materials, was found. The important role played by the atomistic symmetry of the crystals on controlling and generating the surface instabilities is explained; the importance of the velocity and orientation-dependent cleavage energy is discussed. The surface instabilities are generated to satisfy minimum energy dissipation considerations. These findings necessitate a new approach to the fundamentals of dynamic crack propagation in brittle single crystals.
AB - The phenomena occurring during rapid crack propagation in brittle single crystals was studied by cleaving strip-like silicon specimens along the {1 1 1} low-energy cleavage plane under bending. The experiments reveal phenomena associated with rapid crack propagation in brittle single crystals not previously reported, and new crack path instabilities in particular. In contrast to amorphous materials, the observed instabilities are generated at relatively low velocity, while at high velocity the crack path remains stable. The experiments demonstrate that crack velocity in single crystals can attain the theoretical limit. No evidence for mirror, mist, and hackle instabilities, typical in amorphous materials, was found. The important role played by the atomistic symmetry of the crystals on controlling and generating the surface instabilities is explained; the importance of the velocity and orientation-dependent cleavage energy is discussed. The surface instabilities are generated to satisfy minimum energy dissipation considerations. These findings necessitate a new approach to the fundamentals of dynamic crack propagation in brittle single crystals.
KW - Brittle single crystals
KW - Cleavage
KW - Crystal symmetry
KW - Dynamic fracture
KW - Dynamic instabilities
UR - http://www.scopus.com/inward/record.url?scp=38749105750&partnerID=8YFLogxK
U2 - 10.1016/j.jmps.2007.05.010
DO - 10.1016/j.jmps.2007.05.010
M3 - מאמר
AN - SCOPUS:38749105750
VL - 56
SP - 376
EP - 387
JO - Journal of the Mechanics and Physics of Solids
JF - Journal of the Mechanics and Physics of Solids
SN - 0022-5096
IS - 2
ER -