COMPUTATIONAL BALLISTIC IMPACT ANALYSIS OF AIRCRAFT ARMORS
Lightweight and ballistic resistance are significant parameters in the design of aircraft armors. Aircraft should not compromise the payload or its maneuverability due to the armors added to the system. In addition to this, the aircraft has to sustain high ballistic resistance under enemy fire. In the design of aircraft armors choosing light and high strength materials that respond to these demands ballistic impact resistant concepts are being developed.
In this study numerical simulation of ballistic impact is carried out for the aircraft armors. The ballistic impact response of the fiber reinforced composite armor is computed using forward finite difference method. Cylindrical rigid projectile hitting the woven crimp composite fabric at an angle 90° is analyzed. The yarn segments between hinged joints at crossovers are modeled using discrete mass-spring-damper in pin-joint systems consisting of planar square lattices. After a certain time of impact; displacement of the fabric, change in the velocities and the failure in the material is computed and depicted graphically. The effect of crimp and slip viscosity on the ballistic performance of the fabric is examined and discussed.
 Yang H H, (1992): Kevlar Aramid Fiber, John Wiley &Sons Ltd, New York, 1992.
 Rakhmatulin KhA, (1947): Impact on a flexible fiber, Prikl Mat Mekh 11, 379–82 (in English).
 Rakhmatulin KhA, (1951): Normal impact at a varying velocity on a flexible fiber Uchenye Zapiski Moskovosk gos Univ 4, 154 (in English).
 Rakhmatulin KhA, (1952) Normal impact on a flexible fiber by a body of given shape Prikl Mat Mekh 16, 23–24 (in English).
 Rakhmatulin KhA, Dem’yanov YuA, (1961): Strength under High Transient Loads, pp 94-152.
 Smith J C, McCrackin F L, Schniefer H F, (1956): Stress-Strain Relationships in Yarns Subjected to Rapid Impact Loading, Textile Research Journal, 28 (4), 288-302.
 Phoenix S L, Porwal P K, (2003): A new membrane model for ballistic impact response and V50 performance of multi-ply fibrous systems, Int J Solids and Structures, 40, 6723-6765.
 Porwal P K, Phoenix S L, (2005): Modeling system effects in ballistic impact into multi-layered fibrous materials for soft body armor, Int J Fracture, 135, 217-249.
 Porwal P K, Phoenix S L, (2008): Effects of layer stacking order on the V50 velocity of a two-layered hybrid armor system, Journal of Mechanics of Materials and Structures, 3, 627-639.
 Roylance D, Wilde A, Tocci G, (1973): Ballistic impact of textile structures, Textile Research Journal, 43, 34–41.
 Roylance D, Wang S S, (1980): Penetration mechanics of textile structures, Ballistic Materials and Penetration Mechanics, Elsevier, Amsterdam.
 Ting C, Ting, J, Cunniff P M, Roylance D, (1998): Numerical characterization of the effects of transverse yarn interaction on textile ballistic response, Proceedings of the 30th International SAMPE Technical Conference, 57–67.
 Cunniff P M, Ting J, (1999): Development of a numerical model to characterize the ballistic behavior of fabrics, Proceedings of the 18th International Symposium on Ballistics, San Antonio TX,15-19 November, 822-828.
 Roylance D, Chammas P, Ting J, Chi H, Scott B, (1995): Numerical modeling of fabric impact, Proceedings of the National Meeting of the American Society of Mechanical Engineers ASME, San Francisco, October.
 Lim C T, Shim V P W, Ng Y H, (2003): Finite-element modeling of the ballistic impact of fabric armor, Int J Impact Eng 28, 13–31.
 Novotny W R, Cepus E, Shahkarami A, Vaziri R, Poursartip A, (2007): Numerical investigation of the ballistic efficiency of multi-ply fabric armours during the early stages of impact, Int. J. Impact Eng. 34 2007 71–88.
 Zeng X S, Tan V B C, Shim V P W, (2006): Modelling inter-yarn friction in woven fabric armour, Int J Numer Meth Eng 66, 1309–1330.
 Zeng X S, Shim V P W, Tan V B C, (2005): Influence of boundary conditions on the ballistic performance of high-strength fabric targets, Int J Impact Eng 32, 631–642.
 Shimek M E, Fahrenthold E P, (2015): Impact Dynamics Simulation for Multilayer Fabrics of Various Weaves, AIAA Journal, 53, 1793-1811.
 Shimek M E, Fahrenthold E P, (2012): Effects of Weave Type on Ballistic Performance of Fabrics, AIAA Journal, 50, pp 2558-2565.
 Özşahin E, Tolun S, (2010): Effects of surface coating and support layer on the ballistic performance of aluminum plates, Journal of Aeronautics and Space Technologies, 4: 4, 41-50 (in Turkish).
 Özşahin E, Tolun S, (2009): An empirical model for high velocity impact behavior of aluminum plates, Journal of Aeronautics and Space Technologies, 4: 2, 59-65 (in Turkish).
 Bozdoğan F, Üngün S, Temel E, Süpüren Mengüç G (2015): Textiles used for balistic protection, their properties and balistic performance tests, Journal of Textiles and Engineer, 22: 98, 84-103 (in Turkish).
 Oğlakcıoğlu N, Ertekin G, Marmaralı A, (2014): Investigation of mechanical hazard resistance properties of knitted fabrics produced by high performance yarns, Journal of Textiles and Engineer, 21: 95, 1-8 (in Turkish).
 Yavuz A K, Phoenix S L, Eken S, (2016) The Ballistic Impact Response of Flexible Composite Body Armor, American Society for Composites 31 Technical Conference and ASTM Committee D30 Meeting, September 19-22, 2016, Williamsburg, Virginia-USA.
 Eken S, Phoenix S L, Yavuz A K, (2016) Computational Model for Woven Fabrics Subjected to Ballistic Impact by a Projectile, American Society for Composites 31 Technical Conference and ASTM Committee D30 Meeting, September 19-22, 2016, Williamsburg, Virginia-USA.
 Phoenix S L, Eken S, Yavuz A K, (2016) PC-Based Numerical Modeling of Ballistic Impact into Nonwoven Fibrous Targets, American Society for Composites 31 Technical Conference and ASTM Committee D30 Meeting, September 19-22, 2016, Williamsburg, Virginia-USA.
 Zhou R, (2014) Effects of Crimp and Slip on Laminar and Woven Fabrics Subjected to Ballistic Impact, PhD Thesis, Cornell University.
 Shahkarami A, (1999): A numerical investigation of ballistic impact on textile structures, MSc Thesis, British Columbia University.
 ASTM International. 2008. Standard test method for yarn crimp and yarn take-up in woven fabrics. ASTM D3883-04.
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