Failure Analysis of Hybrid Armor Under High Velocity Impact

2000 ◽  
Author(s):  
Hassan Mahfuz ◽  
Yuehui Zhu ◽  
Wahid A. Mamun ◽  
Anwarul Haque ◽  
Shaik Jeelani
Keyword(s):  
Failure Analysis ◽  
High Velocity ◽  
Material Model ◽  
Fe Model ◽  
High Velocity Impact ◽  
Depth Of Penetration ◽  
Velocity Impact ◽  
Rubber Layer ◽  
Gas Gun ◽  
Set Up

Abstract Failure analysis of hybrid integral armor has been performed using finite element method. LS-DYNA3D code has been employed to investigate the response of an integral armor under high velocity impact. A 3-D FE model consisting of the various layers of the armor has been developed and subjected to transient dynamic loading. The analysis is based on actual experiments conducted in a gas gun set up. V50 velocity for a Fragment Simulating Projectile (FSP) has been considered, and the corresponding responses have been investigated to assess the failure of the armor at the ballistic limit. The investigation consisted of three successive studies; first, a base model was developed to have preliminary ideas about the energy absorption and the depth of penetration. Second, interface gap elements were introduced at the rubber interfaces, as the delamination across the rubber layer seemed critical in the failure of the armor. Third, a user defined material model has been introduced to account for the fracture behavior of ceramic. Details of the development of the models, and the analysis of failure are presented in this paper.

Numerical Simulation of High Velocity Impact with SPH Frictionless Contact Algorithm

2010 ◽  
Vol 44-47 ◽  
pp. 1787-1791
Author(s):  
Zhi Chun Zhang ◽  
Hong Fu Qiang ◽  
Wei Ran Gao
Keyword(s):  
High Velocity ◽  
Material Model ◽  
Damage Effect ◽  
Neighborhood Search ◽  
High Velocity Impact ◽  
Frictionless Contact ◽  
Velocity Impact ◽  
Contact Algorithm ◽  
To Come ◽  
Cylindrical Steel

The continuity velocity algorithm is widely used in SPH for high velocity impact simulation, but there is some error when calculating the separation between projectile and target. This paper adopts SPH frictionless contact algorithm to handle the contact problem in high velocity impact, and the perforation of a cylindrical steel projectile impacting a plate target is simulated in 3D. The corrected Johnson-Cook material model with damage effect and Gruneisen equation of state are adopted for the target. The SPH frictionless contact algorithm checks interpenetration between projectile and target using SPH neighborhood search, and contact force is enforced for contact particles. The comparisons between numerical simulations and experimental observations show that the SPH frictionless contact algorithm allow projectile and target to come together and separate in a physically correct manner.

EXPERIMENTAL INVESTIGATION OF HIGH VELOCITY IMPACT ON CNT REINFORCED COMPOSITES EMPLOYING SINGLE STAGE GAS GUN

2021 ◽  
Author(s):  
D. MUNIRAJ ◽  
S. MUGHILARASAN ◽  
V. M. SREEHARI
Keyword(s):  
High Velocity ◽  
Composite Plate ◽  
Epoxy Composite ◽  
Impact Load ◽  
Single Stage ◽  
High Velocity Impact ◽  
Velocity Impact ◽  
Weight Percentage ◽  
Impact Performance ◽  
Gas Gun

Composite plays a significant role in the field of aerospace due to its excellent mechanical properties, nevertheless, they are highly susceptible to out-of-plane impact load. Fibre-reinforced composite fails effortlessly under impact load and absorb energy through damage mechanics rather than deformation. The present study investigates the damage behaviour of the CNT reinforced carbon fibre-epoxy composite under high velocity impact using single stage gas gun. Composite plates were fabricated with 0 to 0.6 weight percentage content of CNT as reinforcement using vacuum assisted resin transfer moulding. A series of impact test with various impact energy was carried out on carbon/epoxy composite plate to study the impact performance. From the experimentation it was observed that the 0.3 weight percentage CNT addition provides the optimum impact performance. Damage characterization was performed for various impact velocity based on the micro and macro scale damage area. Knowledge of the damage behaviour of CNT reinforced carbon fibreepoxy composite plate under high velocity impact loads is essential for both the product development and material selection in the aerospace application.

A multi-stage material model calibration procedure for enhancing numerical solution fidelity in the case of impact loading of composites

2020 ◽  
Vol 55 (1) ◽  
pp. 39-56
Author(s):  
Efthimios Giannaros ◽  
Athanasios Kotzakolios ◽  
George Sotiriadis ◽  
Vassilis Kostopoulos
Keyword(s):  
High Velocity ◽  
Compressive Load ◽  
Material Model ◽  
Parameter Determination ◽  
Model Parameters ◽  
Computational Error ◽  
High Velocity Impact ◽  
Velocity Impact ◽  
Compression Loading ◽  
Percentage Difference

The numerical prediction of impact-induced damage to composite materials and the subsequent residual strength under compression loading continue to be a challenging task. The current study proposes a calibration routine for optimizing the set of material model parameters prior to the virtual simulation of impact tests, which also simplifies the process of parameter determination. The calibration algorithm is based on the comparison of the numerical force-strain or force-displacement curves with the corresponding experimental ones to get the optimal input data, and it includes basic quasi-static material characterization tests. For the sake of simplicity, the calibration process was divided into two parts. The first part includes the in-plane loading tests (tension 0° & 90°, compression 0° & 90°, shear and open-hole tension) for calibration of orthotropic damage material model; whereas the second one consists of the mode I and mode II interlaminar fracture tests as well as the short beam shear test, and it mainly targets to the adjustment of cohesive model parameters. Given the optimal set of parameters of material models, low and high velocity impact simulations at the energy level of 30 J were carried-out to LS-DYNA software and compared with experiments. The percentage difference between numerical and experimental delamination area, after the calibration enablement, reduced from 77% and 60% to 10% and 25% for low- and high-velocity impact, respectively. Afterwards, the damaged specimens were experimentally and virtually tested to compression loading. In terms of maximum compressive load, the computational error is close to 1% for both impact conditions.

Numerical Simulation of Multilayer Composites Failure under Dynamic Loading

2015 ◽  
Vol 756 ◽  
pp. 408-413 ◽  
Author(s):  
Sergey A. Zelepugin ◽  
Aleksey S. Zelepugin
Keyword(s):  
Kinetic Model ◽  
High Velocity ◽  
High Velocity Impact ◽  
The Finite Element Method ◽  
Depth Of Penetration ◽  
Sharp Drop ◽  
Composite Target ◽  
Velocity Impact ◽  
Relaxation Of Stresses ◽  
The Impact

The processes of high-velocity interaction of a projectile with a metal-intermetallic laminate (MIL) composite target were numerically investigated in axisymmetrical geometry using the finite element method. To simulate the failure of the material under high velocity impact, we applied the active-type kinetic model determining the growth of microdamages, which continuously changes the properties of the material and induce the relaxation of stresses. To simulate the brittle-like failure of the intermetallic material under high velocity impact, we modified the kinetic model of failure and included the possibility of failure above Hugoniot elastic limit in the shock wave and sharp drop in strength characteristics if the failure begins. The results show that the depth of penetration depends on the thicknesses of intermetallic and titanium alloy layers. The Al3Ti/Ti-6-4 MIL composite target withstands the impact loading in the case of the ratio about 4/1.

High Velocity Impact Modelling of Sandwich Panels with Aluminium Foam Core and Aluminium Sheet Skins

2014 ◽  
Vol 553 ◽  
pp. 745-750 ◽  
Author(s):  
Cheng Jun Liu ◽  
Yi Xia Zhang ◽  
Qing Hua Qin ◽  
Rikard Heslehurst
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
High Velocity ◽  
Sandwich Panels ◽  
Material Model ◽  
Element Model ◽  
Aluminium Foam ◽  
Foam Core ◽  
High Velocity Impact ◽  
Velocity Impact

A finite element model is developed in this paper to simulate the perforation of aluminium foam sandwich panels subjected to high velocity impact using the commercial finite element analysis software LS-DYNA. The aluminum foam core is governed by the material model of crushable foam materials, while both aluminium alloy face sheets are modeled with the simplified Johnson-Cook material model. A non-linear cohesive contact model is employed to simulate failure between adjacent layers, and an erosion contact model is used to define contact between bullets and panels. All components in the model are meshed with 3D solid element SOLID 164. The developed finite element model is used to simulate the dynamic response of an aluminium foam sandwich panel subjected to projectile impact at velocity ranging from 76 m/s to 187m/s. The relationship between initial velocity and exit velocity of the projectile obtained from numerical modelling agrees well with that obtained from experimental study, demonstrating the effectiveness of the developed finite element model in simulating perforation of sandwich panels subjected to high velocity impact.

scholarly journals A Numerical Study on High Velocity Impact Behavior of Titanium Based Fiber Metal Laminates

2018 ◽  
Vol 2 (4) ◽  
pp. 62 ◽  
Author(s):  
Gin Chai ◽  
Periyasamy Manikandan ◽  
Xin Li
Keyword(s):  
High Velocity ◽  
Volume Fraction ◽  
Numerical Study ◽  
Composite Layer ◽  
Fe Model ◽  
High Velocity Impact ◽  
Fiber Metal Laminates ◽  
Residual Velocity ◽  
Velocity Impact ◽  
Fiber Metal

The present paper gives details of the structural response of titanium-based fiber metal laminates (TFML) subjected to high velocity impact. Dynamic perforation behavior of two different sample configurations, TFML-2/1 and 3/2 are presented. The behavior of the metal and composite layer is defined using two independent appropriate constitutive material models. Both experimental and numerically predicted residual velocity follows the Recht-Ipson model variation with impact velocity. Being larger in thickness, residual velocity, peak contact force and total energy absorbed were found to be larger for TFML-3/2 than 2/1. However, the contact duration was rather insignificantly affected. Having similar metal volume fraction (MVF), energy dissipated by means of plastic deformation of metal layers was found to be constant for both TFML configurations that were considered. The axisymmetric loading, boundary conditions and having balanced material property distribution along the principle axes resulted in doubly symmetric damage surfaces, both layer-wise and overall. The developed finite element (FE) model adequately simulated the contact behavior and all of the experimentally realized damage modes in the metal and composite layers and confirmed its reliability. Having limited experimental information, the obtained numerical information allows one to briefly understand the dynamic perforation behavior of TFML laminates.

scholarly journals Bayesian model selection for metal yield models in high-velocity impact

2019 ◽  
Author(s):  
Teresa Portone ◽  
John Niederhaus ◽  
Jason Sanchez ◽  
Laura Swiler
Keyword(s):  
High Velocity ◽  
Tungsten Alloy ◽  
High Velocity Impact ◽  
Depth Of Penetration ◽  
Velocity Impact ◽  
Selection For ◽  
Penetration Data ◽  
Von Mises ◽  
Stress Models ◽  
Quantities Of Interest

Abstract There are multiple candidate models for the von Mises yield stress in elastoplastic models that are used to simulate material deformation in high-velocity impact. Previous work has studied the effects of such models on quantities of interest in high-strain-rate deformation, in order to select the most appropriate model in comparison to experimental data [1-2]. This work focuses on selecting between three such models, based on their ability to reproduce time-varying depth of penetration data of a tungsten-alloy rod impacting a hardened steel plate at high velocity, measured by Anderson, Hohler et al. [3]. Novel in the present study is the systematic treatment of uncertainty in the process, and automation of the process. The three models considered are the Johnson-Cook (JC), Zerilli-Armstrong (ZA), and Steinberg-Guinan-Lund (SGL) flow stress models [4-6].

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