Two-scale modeling of high-velocity fragment GFRP penetration for assessment of ballistic limit

2017 ◽  
Vol 101 ◽  
pp. 42-48 ◽  
Author(s):  
M.V. Zhikharev ◽  
S.B. Sapozhnikov
Keyword(s):  
High Velocity ◽  
Ballistic Limit ◽  
Scale Modeling

scholarly journals On the ballistic limit of an aerial vehicle impacting against a thin metal screen at a high velocity

2019 ◽  
Author(s):  
V. I. Pusev ◽  
A. M. Kuslya ◽  
V. A. Markov ◽  
Yu. V. Popov ◽  
S. I. Sychev
Keyword(s):  
High Velocity ◽  
Thin Metal ◽  
Ballistic Limit ◽  
Metal Screen ◽  
Aerial Vehicle

Modelling High Velocity Impact on Aluminium Alloy 7075-T6 under Axial Pretension

2014 ◽  
Vol 629 ◽  
pp. 498-502 ◽  
Author(s):  
K.A. Kamarudin ◽  
Al Emran Ismail
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Aluminium Alloy ◽  
High Velocity ◽  
Numerical Study ◽  
Element Model ◽  
Ballistic Limit ◽  
High Velocity Impact ◽  
Velocity Impact

This paper explains the utilisation of finite element model to analyse the ballistic limit of aluminium alloy 7075-T6 impacted by 8.33 g with 12.5 mm radius rigid spherical projectiles. This numerical study was compared with the results obtained experimentally. During impact, the targets were subjected to either non- or uniaxial- pretension and the projectile travelled horizontally to the target. It was observed that pretensioned targets were more vulnerable, which reduced the ballistic limit. The existence of harmful failures owing to pretension impact was ascertained and compared with the non-pretension targets.

High-velocity perforation behaviour of sandwich panels with Al/SiCp composite foam core

2019 ◽  
Vol 54 (11) ◽  
pp. 1483-1495
Author(s):  
M Golestanipour ◽  
A Babakhani ◽  
S Mojtaba Zebarjad
Keyword(s):  
High Velocity ◽  
Sandwich Panels ◽  
Sheet Thickness ◽  
Foam Core ◽  
Ballistic Limit ◽  
Absorbed Energy ◽  
Composite Foam ◽  
Good Energy ◽  
Energy Absorbers ◽  
Energy Absorbing

Aluminium foam core sandwich panels are good energy absorbers for impact protection applications, such as light-weight structural panels, packing materials and energy absorbing devices. In this study, the high-velocity perforation response of a range of sandwich panels with Al A356/SiCp composite foam core and 1100 aluminium face-sheets has been investigated using a conventional gas gun. Impact perforation tests were carried out using a 10-mm diameter conical nosed indenter at velocities up to that required to achieve complete perforation of the target (i.e. 230 m/s). The effects of face-sheet thickness, density and thickness of aluminium composite foam core on the total, specific and extra absorbed energy and also ballistic limit of the panels during impact penetration were experimentally investigated. During test, top face-sheets globally bended and tore into several pieces and so absorbed part of impact energy. Rupture and densification are two deformation modes and energy absorption mechanisms of foam core. Localized indentation and tearing, global bending and delamination were also observed on back face-sheets. Higher foam core density and thickness and also thicker face-sheets resulted in higher absorbed energy and ballistic limit.

The Behaviour of Fibre-Metal Laminates under High Velocity Impact Loading with Different Stacking Sequences of Al Alloy

2012 ◽  
Vol 225 ◽  
pp. 213-218 ◽  
Author(s):  
A.A. Ramadhan ◽  
Abdul Rahim Abu Talib ◽  
Azmin Shakrine Mohd Rafie ◽  
R. Zahari
Keyword(s):  
Impact Loading ◽  
High Velocity ◽  
Stacking Sequence ◽  
Ballistic Limit ◽  
High Velocity Impact ◽  
Velocity Impact ◽  
Limit Velocity ◽  
Fibre Metal ◽  
Ballistic Limit Velocity ◽  
The Impact

The high velocity impact response of composite laminated plates has been experimentally investigated using a nitrogen gas gun. Tests were undertaken on fibre-metal laminate (FML) structures based on Kevlar-29 fiber/epoxy-Alumina resin with different stacking sequences of 6061-T6 Al plates. Impact testing was conducted using a cylindrical shape of 7.62 mm diameter steel projectile at 400m/s velocity, which was investigated to achieve complete perforation of the target. The numerical parametric study of ballistic impacts caused by similar conditions in experimental work is undertaken to predict the ballistic limit velocity, energy absorbed by the target, and comparisons between simulations by using ANSYS AUTODYN 3D v.12.1 software and experimental work to study the effects of the shape of the projectile with different (4, 8, 12, 16 and 20mm) thicknesses on the ballistic limit velocity. While only one thickness was used with 24mm of back stacking sequence, it was not penetrated. The sequence of the Al plate position (front, middle and back) inside laminate plates of the composite specimen was also studied. The Al back stacking sequence plate for the overall results obtained was the optimum structure to resist the impact loading. The simulation results obtained of the residual velocity hereby are in good agreement with the experimental results with an average error of 1.8%. The energy absorption was obtained with 7.3% and 2.7% of the back to front and back to middle of the Al stacking sequence respectively. Hence, the back Al stacking sequence is considered the optimum position for resisting the impact loading. The data showed that these novel sandwich structures exhibit excellent energy-absorbing characteristics under high-velocity impact loading conditions. Hence, it is considered suitable for aerospace applications.

scholarly journals A Strain-rate Dependant Micromechanical Finite Element Model for High-velocity Impacts on Laminated Composite Plates

2019 ◽  
Vol 304 ◽  
pp. 01009
Author(s):  
Dimitris K. Siorikis ◽  
Christos V. Nastos ◽  
Dimitris A. Saravanos ◽  
Esteban Martino Gonzalez
Keyword(s):  
Strain Rate ◽  
High Velocity ◽  
Impact Damage ◽  
Laminated Composite ◽  
Composite Plates ◽  
Ballistic Limit ◽  
Laminated Composite Plates ◽  
Strain Rate Effects ◽  
Damage Initiation ◽  
High Velocity Impacts

A novel multi-scale numerical model for the simulation of high-velocity impacts on laminated composite plates is developed, which encompasses a micromechanics module for the accurate assessment of damage initiation and growth in the individual composite micromechanical constituents and for the efficient inclusion of strain rate effects into the analysis. A series of woven carbon/epoxy plate specimens impacted by steel ball impactors of high velocities and energies reaching and exceeding the ballistic limit (m=110 g, v=60-100 m/s, E=200-500 J) are also investigated. Ultimately, key impact simulation results, such as the ballistic limit and induced impact damage, are correlated with representative experimental results, demonstrating the validity of the proposed impact model.

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