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Effect of core topology on projectile penetration in hybrid aluminum/alumina sandwich structures
- Source :
- International Journal of Impact Engineering. :99-113
- Publisher :
- The Authors. Published by Elsevier Ltd.
-
Abstract
- A series of hybrid sandwich structures were fabricated by shrink-fitting precision-ground prisms of alumina (CoorsTek grade AD 995) with triangular, trapezoidal or rectangular cross-sections into the voids of extruded sandwich panels made from Al 6061-T6. The panels were subjected to impact tests using hard steel spheres over the velocity range 570–1800 m s −1 . A combination of X-ray tomography, high-speed video imaging and cross sectioning of impacted samples was used to investigate the penetration mechanisms. We find that the ballistic performance of these structures, characterized by the ballistic limit and the exit velocity of impact ejecta beyond this limit, is significantly improved when triangular prisms are replaced by trapezoidal prisms, provided the base width of the prism exceeds about three times the projectile diameter. Additional performance improvements are obtained when the trapezoidal prisms are replaced by rectangular prisms, albeit at the expense of an increase in the lateral extent of damage. The variations in impact response are found to arise from: (i) the effect of prism size and shape on the degree of confinement of the ceramic by the metallic webs, (ii) the core web structure, which influences the fracture conoid angle in the transverse plane, and (iii) the spacing of web-face nodes on the back face, which governs the deflection and fracture of the back-face sheet.
- Subjects :
- Materials science
Projectile
Mechanical Engineering
Ballistics
Aerospace Engineering
Ocean Engineering
Transverse plane
Mechanics of Materials
visual_art
Sandwich panels
Automotive Engineering
visual_art.visual_art_medium
Ballistic limit
SPHERES
Ceramic
Prism
Composite material
Safety, Risk, Reliability and Quality
Cellular structures
Sandwich-structured composite
Civil and Structural Engineering
Subjects
Details
- Language :
- English
- ISSN :
- 0734743X
- Database :
- OpenAIRE
- Journal :
- International Journal of Impact Engineering
- Accession number :
- edsair.doi.dedup.....9aa9f512fb39cc12147aa1824384dede
- Full Text :
- https://doi.org/10.1016/j.ijimpeng.2013.05.008