Ballistic
Mostrando 13-24 de 100 artigos, teses e dissertações.
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13. Ballistic Performance of Mallow and Jute Natural Fabrics Reinforced Epoxy Composites in Multilayered Armor
Natural fiber reinforced polymer composites have recently been investigated as a component of multilayered armor system (MAS). These composites were found to present advantages when replacing conventional high strength synthetic aramid fabric laminate composite (KevlarTM, with same thickness, as MAS second layer. Continuous and loose natural fibers were up t
Mat. Res.. Publicado em: 23/10/2017
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14. Phenomenology of the Maximum Fragment Mass Dependence Upon Ballistic Impact Parameters
Abstract Molecular dynamics simulations of the ballistic Taylor test are used to explore correlation between the largest fragment mass and the impact energy of a projectile as well as a set of selected state variables. Flat-ended, monocrystalline, nanoscale bars collide with a rigid wall with striking velocities ranging from 0.27 km/s to 60 km/s. The investi
Lat. Am. j. solids struct.. Publicado em: 2017-08
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15. An Empirical Study on Ballistic Resistance of Sandwich Targets with Aluminum Facesheets and Composite Core
Abstract This study attempted to examine the ballistic resistance of sandwich structures with aluminum facesheets, polyurethane core and polyurethane foam reinforced with aluminum pins. The main focus was on the effect of variations in density of core foam and the effect of adding different percentages of aluminum pins on energy absorption and ballistic resi
Lat. Am. j. solids struct.. Publicado em: 2017-06
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16. Ballistic Application of Coir Fiber Reinforced Epoxy Composite in Multilayered Armor
Multilayered armor systems (MAS) composed of relatively lighter materials with capacity to provide personal ballistic protection are being extensively investigated and used in armor vests. A typical MAS to stand high impact energy 7.62 mm bullet has a front ceramic followed by an aramid fabric laminate, such as Kevlar™. Since both the army and municipal po
Mat. Res.. Publicado em: 15/05/2017
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17. Evaluation of Conceptual Midcourse Guidance Laws for Long-Range Exoatmospheric Interceptors
ABSTRACT: This paper presents a comprehensive study on the performance analysis of 8 conceptual guidance laws for exoatmospheric interception of ballistic missiles. The problem is to find the effective thrust direction of interceptor for interception of short-to-super range ballistic missiles. The zero-effort miss and the generalized required velocity concep
J. Aerosp. Technol. Manag.. Publicado em: 2017-03
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18. Experimental and Numerical Investigation of Perforation of Thin Polycarbonate Plate by Projectiles of Different Nose Shape
Abstract The present study is based on experimental investigation and numerical simulation of impact of different nose shape projectiles on thin polycarbonate plates. Rigid hardened projectiles of two different geometries (Blunt and Truncated cone) keeping the same shank diameter and total mass were prepared. These projectiles were impacted through pneumatic
Lat. Am. j. solids struct.. Publicado em: 2017-02
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19. Numerical Material Model for Composite Laminates in High-Velocity Impact Simulation
Abstract A numerical material model for composite laminate, was developed and integrated into the nonlinear dynamic explicit finite element programs as a material user subroutine. This model coupling nonlinear state of equation (EOS), was a macro-mechanics model, which was used to simulate the major mechanical behaviors of composite laminate under high-veloc
Lat. Am. j. solids struct.. Publicado em: 2017
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20. Ballistic Limit of High-Strength Steel and Al7075-T6 Multi-Layered Plates Under 7.62-mm Armour Piercing Projectile Impact
Abstract This paper presents the computational-based ballistic limit of laminated metal panels comprised of high strength steel and aluminium alloy Al7075-T6 plate at different thickness combinations to necessitate the weight reduction of existing armour steel plate. The numerical models of monolithic configuration, double-layered configuration and triple-la
Lat. Am. j. solids struct.. Publicado em: 2016-09
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21. Study of Aramid Fiber/Polychloroprene Recycling Process by Thermal Degradation
ABSTRACT Aramid fiber is an important polymer applied as reinforcement in high-performance composites, which, due its exceptional properties, becomes an excellent impact absorption material. It has been broadly utilized in aeronautic industry and ballistic protection. In aircrafts, it is mainly used in secondary structures, such as fairings, floor panels, an
J. Aerosp. Technol. Manag.. Publicado em: 2016-09
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22. Finite Element Analysis of Pilot’s Helmet Design Using Composite Materials for Military Aircraft
ABSTRACT The objective of this research was to design pilot helmets and to perform analysis of designed ballistic helmet against impact strength of bullet in Solidworks and Laminator software. The material used for construction of the helmet is fiber reinforced polymer matrix composite in which polymer matrix is made of nylon, a thermoset resin, and the fibe
J. Aerosp. Technol. Manag.. Publicado em: 2016-03
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23. Vibration and Energy Dissipation of Nanocomposite Laminates for Below Ballistic Impact Loading
Abstract Composite laminates are made of glass woven roving mats of 610gsm, epoxy resin and nano clay which are subjected to projectile impact. Nano clay dispersion is varied from 1% to 5%. Impact tests are conducted in a gas gun setup with a spherical nose cylindrical projectile of diameter 9.5 mm of mass 7.6 g. The energy absorbed by the laminates when sub
Lat. Am. j. solids struct.. Publicado em: 2015-12
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24. A numerical study on the impact behavior of foam-cored cylindrical sandwich shells subjected to normal/oblique impact
Abstract Finite element analysis was used to investigate the impact behavior of the foam-cored sandwich shells under the ballistic impact. The ballistic limit, failure mode of the face-sheet and energy absorption of the uniform/graded core were discussed in this paper. Based on the impact phase diagrams, the effects of several factors (i.e. projectile shape
Lat. Am. j. solids struct.. Publicado em: 2015-11