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Two Critical Crack Propagating Velocities for PMMA Fracture Surface

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Abstract

Ultrasonic fractography and scanning electronic microscopy (SEM) are used to determine the direct relationship between the fracture surface morphology and the main crack velocity during the rapid rupture of polymethylmethacrylate (PMMA). Two critical crack velocities are found for the fracture. Quasi-parabolic markings will appear when the crack speed exceeds the first critical speed. Crack propagating at speed above the second critical speed leaves a thicket of small branches penetrating the surface behind them. Both critical speeds are functions of the thickness of the specimens.

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Authors and Affiliations

  1. Chinese Academy of Sciences, Laboratory for Nonlinear Mechanics of Continuous Media (LNM), Institute of Mechanics, Beijing, 100080, P. R. China

    J. S. Sheng & Ya-Pu Zhao

Authors
  1. J. S. Sheng
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  2. Ya-Pu Zhao
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Sheng, J.S., Zhao, YP. Two Critical Crack Propagating Velocities for PMMA Fracture Surface. International Journal of Fracture 98, 9–14 (1999). https://doi.org/10.1023/A:1018728125638

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  • DOI: https://doi.org/10.1023/A:1018728125638

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