Dynamic Finite Element and Dynamic Photoelastic Analyses of Two Fracturing Homalite-100 Plates.
WASHINGTON UNIV SEATTLE DEPT OF MECHANICAL ENGINEERING
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A dynamic finite element code, HONDO, was used to analyze two single-edge-notched fracturing Homalite-100 plates which had been previously studied by dynamic photoelasticity. A single-edge crack in the finite element model was advanced in incremental jumps such that the time averaged crack velocity matched the measured crack velocity in the Homalite-100 plate. Dynamic energy release rates were computed for a constant velocity crack and a crack which arrested after a somewhat constant deceleration. These results were compared with the corresponding dynamic energy release rates, which were computed from the dynamic stress intensity factors determined by dynamic photoelasticity, and by static strain energy release rates. Despite the crude modeling of the running crack, the coarseness of the finite element grid breakdown and the differences in the modeled and actual grip conditions, the computed and measured dynamic energy release rates, except for occasional large differences, generally agreed within 10 percent of each other.
- Metallurgy and Metallography