Journal
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
Volume 151, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijimpeng.2021.103836
Keywords
Pre-stress; Ceramic armour; Hertzian cone; Neutron diffraction; CT scan
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Pre-stressing technique was used to improve the ballistic performance of circular silicon carbide tile against a 12-mm spherical steel projectile. The technique involved a heat-shrunk steel collar to achieve confining pre-stress, which was evaluated through neutron diffraction. Ballistic experiments and simulations showed that pre-stress could reduce crack propagation and alter paths of damage by increasing negative triaxiality.
A pre-stressing technique for improving the ballistic performance of a circular silicon carbide tile has been tested against empty set12-mm spherical steel projectile. The confining pre-stress was achieved through a heat-shrunk steel collar and was evaluated through neutron diffraction for the ceramic-collar system. Subsequent ballistic experiments and simulations of the impact event were used to elucidate the mechanisms and benefits of pre-stress on the ballistic response. CT-scans of various specimens, post-impact, show that the pre-stress affects the trajectory of the Hertzian cone and limits the overall damage. Furthermore, simulations qualitatively agreed with the experimental result, showing a reduction in crack propagation and altered paths of damage. Greater confining stress led to higher negative triaxiality, which act to arrest the tensile hoop stresses and corresponding cracks.
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