Abstract
We propose a dynamic combined compressive and shear experimental technique at high strain rates (102-104 s-1). The main apparatus is mainly composed of a projectile, an incident bar and two transmitter bars. The close-to-specimen end of the incident is wedge-shaped with 90 degree. In each experiment, there are two identical specimens respectively agglutinated between one side of the wedge and one of transmitter bars. When a loading impulse travels to specimens along the incident bar, because of the special geometrical shape, the interface of specimen glued with the incident bar has an axial and a transverse velocity. Thus, the specimens endure the combined pressure-shear loading at high strain rates. The compression stress and strain are obtained by strain gages located on the bars; the shear stress is measured by two piezoelectric crystals of quartz with special cut direction embedded at the end (near specimen) of transmitter bars; the shear strain is measured with a novel optical technique which is based on the luminous flux method. The feasibility of this methodology is demonstrated with the SHPSB experiments on a polymer bonded explosive (PBX). Square-shaped specimen is adopted. Experimental results show that the specimen is obviously rate-dependent. Shear and compression failure occur for the specimen.
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Zhao, P.D. et al. (2011). A new technique for combined dynamic compression-shear test. In: Proulx, T. (eds) Dynamic Behavior of Materials, Volume 1. Conference Proceedings of the Society for Experimental Mechanics Series. Springer, New York, NY. https://doi.org/10.1007/978-1-4419-8228-5_63
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DOI: https://doi.org/10.1007/978-1-4419-8228-5_63
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