Cracks in rubber under tension exceed the shear wave speed. Petersan, P. J., Deegan, R. D., Marder, M., & Swinney, H. L. Phys. Rev. Lett., 93(1):015504, 2004.
doi  abstract   bibtex   
The shear wave speed is an upper limit for the speed of cracks loaded in tension in linear elastic solids. We have discovered that in a nonlinear material, cracks in tension (mode I) exceed this sound speed and travel in an intersonic range between shear and longitudinal wave speeds. The experiments are conducted in highly stretched sheets of rubber; intersonic cracks can be produced simply by popping a balloon.
@article{petersan2004,
	Abstract = {The shear wave speed is an upper limit for the speed of
cracks loaded in tension in
linear elastic solids. We have discovered that in a nonlinear material,
cracks in tension (mode I)
exceed this sound speed and travel in an intersonic range between shear
and longitudinal wave
speeds. The experiments are conducted in highly stretched sheets of
rubber; intersonic cracks can be
produced simply by popping a balloon.},
	Author = {Petersan, P. J. and Deegan, R. D. and Marder, M. and Swinney, H. L.},
	Date-Modified = {2010-07-12 18:26:29 -0700},
	Doi = {10.1103/PhysRevLett.93.015504},
	Journal = {Phys. Rev. Lett.},
	Number = {1},
	Pages = {015504},
	Title = {Cracks in rubber under tension exceed the shear wave speed},
	Volume = {93},
	Year = {2004},
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