| Popis: |
The split Hopkinson pressure bar technique has been used successfully to characterize high strain‐rate behavior (103 to 104 s−1) of metals and polymeric materials in the past. Similar studies on composite energetic materials are desired to assist in developing a model that can predict the mechanical response of energetic materials. The strength of cast‐cured and melt‐cast explosives are far lower than metallic materials, requiring a combination of techniques to accurately resolve their deformation characteristics. High‐speed‐imaging techniques have been explored here and compared to conventional strain gauge data for a soft, compliant material as well as a hard, brittle one, which are distinctly different in mechanical behavior. The photographic data coupled with the strain gauge data have proven useful in determining the nature of damage that occurs during the loading cycle. |
