Abstract
A recovered copper shaped-charge jet fragment has been built up by copper electrodeposition for the first time to allow it to be systematically sectioned and polished for detailed observations by optical and electron microscopy. The residual jet fragment microstructure was observed to have a recrystallized grain structure and dislocation substructures similar to those in the undeformed copper shaped charge liner cone. However, the average grain size in the recrystallized jet fragment was 15 μm compared to 45 μm for the liner. More significantly, however, SEM examination near the tips (or ends) of the jet fragment exhibited voids and coalesced void tunnels elongated axially within the fragment geometry, which are believed to have resulted during jet elongation and breakup by diffusion and viscous growth at high strain and strain rate. The observation of additional porosity in the interior of the jet fragment is supported by the lack of any similar observations in the surrounding and supporting (built up) copper electrodeposit.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
F. I. Grace in “Shock-Wave and High-Strain-Rate Phenomena in Materials”, edited by L. E. Murr, M. A. Meyers and K. P. Staudhammer (Marcel Dekker, New York, 1992) p. 493.
L. Zernow and L. Lowry, in “Shock-Wave and High Strain Rate Phenomena in Materials”, edited by M. A. Meyers, L. E. Murr, K. P. Staudhammer (Marcel Dekker, New York, 1992) Ch. 46.
L. Zernow, PhD dissertation, Johns Hopkins University, MD, USA (1953).
J. Plateau, “Statique experimentale et theoretique des liquides soumis aux seules forces moleculaires” (Paris, 1873).
J. S. W. Rayleigh, “Theory of Sound”, Vol. II (Dover, New York, 1945).
F. A. Nichols and W. W. Mullins, J. Appl. Phys. 36 (1965) 1826.
K. T. Miller and F. F. Lange, Acta Metall. 37 (1989) 1343.
R. E. Green Jr, Rev. Sci. Instrum. 46 (1975) 1257.
F. Jamet and G. Thomer, C. R. Acad. Sci. (Paris) B279 (1974) 501.
F. Jamet, “Investigation of Shaped Charge Jets Using Flash X-Ray Diffraction”. 8th Symposium on Ballistics, Orlando, FL, October 1984.
F. Jamet and R. Charon, “A flash X-ray diffraction system for shaped charge jets analysis”, Report (0211/86) Franco-German Research Institute, Saint-Louis, France, 15 May, 1986.
M. L. Duffy and S. K. Golaski, “Effect of Liner Grain Size on Shaped Charge Jet Performance and Characteristics”, Technical Report BRL-TR-2800, US Army Ballistic Research Laboratory, Aberdeen Proving Ground, MD, 7 April, 1987.
L. Zernow, “Metallurgical, XRD, and SEM Studies of Individual Shaped Charge Jet Particles Captured by Soft Recovery”, International Conference on Ballistics, Nanjing, China, October 1988 (Chinese Academy of Science).
L. E. Murr, “Electron and Ion Microscopy and Microanalysis”, 2nd Edn (Marcel Dekker, New York, 1991).
L. Seaman, D. R. Curran and D. A. Shockey, J. Appl. Phys. 47 (1976) 4814.
L. Seaman, D. R. Curran and R. C. Crewdson, ibid. 49 (1978) 5221.
J. R. Rice and D. M. Tracey, J. Mech. Phys. Solids 17 (1969) 202.
D. R. Curran, L. Seaman and D. A. Shockey, “Shock Wave and High-Strain-Rate Phenomena in Metals”, edited by M. A. Meyers and L. E. Murr (Plenum Press, New York, 1981) Ch. 9, p. 129.
A. H. Chokshi and M. A. Meyers, Scripta Metall. Mater. 24 (1990) 605.
V. Tvergaard, “Influence of Voids on Shear Band Instabilities under Plane Strain Conditions”, Report no. 159, Technical University of Denmark, June, 1979.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Gurevitch, A.C., Murr, L.E., Fisher, W.W. et al. Residual microstructure of a shaped-charge jet fragment. JOURNAL OF MATERIALS SCIENCE 28, 2795–2802 (1993). https://doi.org/10.1007/BF00356221
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/BF00356221