Crack Velocity Measurements in Solithane 113.
Annual technical rept. Jan-Dec 80,
UTAH UNIV SALT LAKE CITY DEPT OF MECHANICAL AND INDUSTRIAL ENGINEERING
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An experimental study of crack propagation speeds in a highly viscoelastic polymer, Solithane 113, is presented in this report. Loadings were applied to precracked sheet specimens over a wide range of rates. Resulting crack speed were found to vary from .003 to 1600 insec .00008 to 40 ms. The primary purpose of this study was to investigate the transition from quasistatic to dynamic crack propagation in viscoelastic materials. It is believed that this transition depends strongly on the viscoelastic material properties. These properties vary widely with time for strongly viscoelastic materials such as Solithane 113 in the modulus transition range above the glass transition temperature. The results showed that the crack speed varied with stress intensity factor raised to a power of 6, in good agreement with previous studies for this material.