High Velocity Impact on Multi-layer Materials
06 Mar 2017-
About: The article was published on 2017-03-06. It has received None citations till now.
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TL;DR: In this paper, a finite element simulation of the ballistic perforation of the ceramic/composite targets, which impacted by cylindrical tungsten projectiles, has been presented.
Abstract: In this paper, based on LS-Dyna code, a new finite element (FE) simulation of the ballistic perforation of the ceramic/composite targets, which impacted by cylindrical tungsten projectiles, has been presented. Research on this method has been conducted by a few research groups in recent years. The ceramic material, which is the front plate, has been made of Alumina 99.5% and composite back-up plate composed of Twaron fibers. The 2-dimensional (2D), axi-symmetric, dynamic-explicit, Lagrangian model has been considered in this simulation. The Johnson–Cook, Johnson–Holmquist and Composite-Damage materials behaviors have been used for projectile, ceramic and composite materials respectively. The brittle fracture and fragmentation of ceramic conoid, the failure criteria based on fracture of fibers or matrixes of composite materials and erosion or flattening of projectile during perforation have been considered. The residual velocity and perforation time has been obtained and compared with the available analytical models. The results show that when the ceramic is impacted by a projectile, a fragmented ceramic conoid breaks from ceramic tile and the semi-angle of ceramic conoid with increasing initial velocity decreases. Furthermore, the dishing of composite layers at high impact velocities and the delamination of layers near the ballistic limit velocity decrease.
118 citations
TL;DR: In this article, a methodology has been developed to design composite personnel armor by optimizing the role each layer plays during projectile defeat, which consists of a very hard 1st layer to deform and fracture the projectile, an orthotropic 2nd layer to slow down the shock wave propagation in the through thickness direction, whilst allowing rapid propagation in transverse directions, a 3rd porous layer to absorb the shock ray energy through PV-work, and a 4th layer to provide confinement for the porous medium.
77 citations
TL;DR: In this paper, an extended orthotropic continuum material model and associated material characterisation techniques for the simulation and validation of impacts onto fiber reinforced composite materials are presented, along with a set of quasi-static and dynamic experiments used to characterise the directional nonlinear strength and extent of damage.
74 citations
TL;DR: In this paper, the authors demonstrate a potentially new concept to enhance the resilience of structures to withstand rapid impulsive loading by using a high wave speed layer to rapidly spread (μs time scales) the locally applied impact load.
47 citations
TL;DR: In this paper, the authors examined the time history of the energy transfer between the projectile and the target, and between the layer and the substrate, and examined the effects of layer damage and imperfect interfaces on load spreading and projectile defeat capabilities of the layers.
43 citations