A new technique for combined dynamic compression-shear test
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.
KeywordsShear Strain High Strain Rate Transverse Velocity Shear Strain Rate Compression Failure
Unable to display preview. Download preview PDF.
- 1.Koller L. and Fowles G., "Compression-shear waves in Arkansas novaculite", In: Timmerhaus K. Barber M., eds. High Pressure Science and Technology, Proceedings of Sixth AIRAPT Conference, Boulder CO, 1977. New York: Plenum Press, 2: 927 (1979).Google Scholar
- 3.Abou-Sayed A.S., Clifton R.J., and Hermann L., "The oblique-plate impact experiment", Exper Mech. 127-132 (1976).Google Scholar
- 5.Prakash V. and Clifton R.J., "Time resolved dynamic friction measurements in pressure-shear". in: Vol. 165 Experimental Techniques in the Dynamics of Deformable Bodies. 33-47 (1993).Google Scholar
- 13.Graff K., Wave motion inelastic solids, Columbus: Ohio University Press, (1975).Google Scholar