Shock and release behavior of filled and unfilled epoxies

Anderson, M. U.; Setchell, R. E.; Cox, D. E.
April 2000
AIP Conference Proceedings;2000, Vol. 505 Issue 1, p551
Academic Journal
The shock and release behavior of both alumina-filled and unfilled epoxies are examined in planar impact experiments. The various materials investigated can be used as encapsulants in applications such as shock-activated pulsed power supplies. Characterizing their dynamic behavior under shock loading and subsequent release is part of a larger effort to develop predictive numerical models for the performance of these power sources. In the current study, reverse-impact techniques were used to establish Hugoniot states and subsequent release profiles for each material at several impact conditions. Laser interferometry (VISAR) was used in these experiments to determine the particle velocity history at the impact interface formed by a projectile-mounted epoxy sample and a stationary fused silica target. Conventional impact configurations and VISAR were used to observe transmitted waveforms under corresponding shock loading conditions. Transmitted waveforms at mutiple Lagrangian locations were also recorded in selected experiments using embedded PVDF piezoelectric films. The results show expected differences in the dynamic properties of filled and unfilled epoxies, and similarities in the properties between different filled or unfilled epoxies. Comparisons between VISAR experiments and PVDF gauge experiments may indicate a rate-dependent response in this gauge material.


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