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The shear wave speed is an upper limit for the speed of cracks loaded intension in linear elastic solids. We have discovered that in a non-linearmaterial, cracks in tension (Mode I) exceed this sound speed, and travel in anintersonic range between shear and longitudinal wave speeds. The experimentsare conducted in highly stretched sheets of rubber; intersonic cracks can beproduced simply by popping a balloon.Comment: 4 pages, 5 eps figure

Cracks in Rubber under Tension Exceed the Shear Wave Speed