Acoustic emissions from rapidly moving cracks

Steven P. Gross, Jay Fineberg, M. Marder, W. D. McCormick, and Harry L. Swinney

Center for Nonlinear Dynamics and Department of Physics, The University of Texas, Austin, Texas 78712

Received 2 August 1993

Linear elasticity is unable to predict completely the dynamics of a rapidly moving crack without the addition of a phenomenological fracture energy. Our measurements of acoustic emission, crack velocity, and surface structure demonstrate quantitatively similar dynamical fracture behavior in two very different materials, polymethylmethacrylate and soda-lime glass. This unexpected agreement suggests that there exist universal features of the fracture energy that result from dissipation of energy in a dynamical instability.