Penetrating Resistance of the Laminated Composite with Stepwise Graded Foam

2010 ◽  
Vol 139-141 ◽  
pp. 72-75
Author(s):  
Feng Huan Sha
Keyword(s):  
Mass Density ◽  
Laminated Composite ◽  
Areal Density ◽  
Equal Mass ◽  
Composite Target ◽  
Perfectly Plastic ◽  
Cellular Target ◽  
Expansion Theory ◽  
The Difference ◽  
Cavity Expansion Theory

The present study focuses on the penetrating resistance of the laminated composite with stepwise graded foam target struck normally by conical-nosed projectiles. The dynamic cavity expansion theory is applied to formulate analytical model. Experimental results verify that this model on account of rigid-perfectly plastic-locking model is suitable for analyzing penetration depth of the projectile into a cellular target. The difference types of foam configurations, with identical areal density, were arranged according to the density of the respective foam. The penetrating process can be divided into 7 stages. Penetrating depth; the effect of mass density and the change of graded/layered core structures of the difference configurations are analyzed. It is found that composite target have a higher penetrating resistance than the monolithic foam material target of equal mass. The analytical results show great potential to reasonable structures for absorbing the dynamics energy and improving the overall penetrating resistance.

Penetration of Cone-Nose Projectile to the Laminated Composite Aluminum Alloy Foam Target

2010 ◽  
Vol 97-101 ◽  
pp. 913-917
Author(s):  
Feng Huan Sha ◽  
Nian Mei Zhang ◽  
Xiao Peng Yan ◽  
Gui Tong Yang
Keyword(s):  
Aluminum Alloy ◽  
Mass Density ◽  
Laminated Composite ◽  
Target Material ◽  
Equal Mass ◽  
Absorption Capacity ◽  
Foam Material ◽  
Composite Target ◽  
Expansion Theory ◽  
Cavity Expansion Theory

A theoretical study is presented herein on the penetration of the laminated composite aluminum alloy foam target struck normally by conical-nosed projectiles. Two layers were arranged according to the density of the respective foam; configuration 1 consisted of 10mm/semi-infinite continuous foams and configuration 2 consisted of 20mm/ semi-infinite continuous foams. The dynamic cavity expansion theory is applied to formulate analytical model. The penetrating process can be divided into 6 stages. The resistance equations during every stage are derived. Penetrating depth of projectile are analyzed. The effect of initial velocity, mass density of foam material and the thickness of the upper layered foam on the penetration resistance are investigated. It is found that composite target have a higher penetrating resistance than the monolithic foam material target of equal mass. The analytical results show that configuration 1 outperformed configuration 2 in regards to their penetrating resistance. The thickness of the upper layered foam within 5-20mm has significant influence on penetrating depth. The energy absorption capacity of the composite target material is evaluated.

Mechanical Behaviours of Open-Cell and Closed-Cell Aluminium Foams against Spherical-Nosed Projectile Penetration

2010 ◽  
Vol 29-32 ◽  
pp. 321-325
Author(s):  
Xiao Peng Yan ◽  
Nian Mei Zhang ◽  
Wei Min Liang ◽  
Yong Gang Zhao ◽  
Gui Tong Yang
Keyword(s):  
Penetration Depth ◽  
Mass Density ◽  
Target Material ◽  
Experiment Data ◽  
Open Cell ◽  
Closed Cell ◽  
Mechanical Behaviours ◽  
Expansion Theory ◽  
The Difference ◽  
Cavity Expansion Theory

In this paper, the mechanical behaviours of open-cell and closed-cell aluminium foams against spherical-nosed projectile penetration are studied theoretically. An analytical model based on dynamic cavity expansion theory and previous experiment data is presented. The analytical equations are derived for the penetration resistance and the final penetration depth during the whole penetrating process. The effects of the mass density of target material, the geometry and initial velocity of the projectiles on the final penetration depth are investigated in detail. It is shown that the final penetration depth mostly lie on the density of aluminium foams and the kinetic energy of projectile. When the density of target is smaller, the final penetration depth of projectile in the closed-cell aluminium foams target is obviously smaller than that in the open-cell aluminium foams target. Meanwhile, with the increase of density of target and the decrease of initial impact velocity, the difference of the capacity of absorbing energy between open-cell and closed-cell aluminium foams targets becomes gradually narrow.

Perforation of Cone-Nose Projectile to Bi-Layered Aluminum Alloy Foam Target

2011 ◽  
Vol 52-54 ◽  
pp. 436-441 ◽  
Author(s):  
Yong Gang Bao ◽  
Nian Mei Zhang ◽  
Gui Tong Yang
Keyword(s):  
Aluminum Alloy ◽  
Theoretical Study ◽  
Mass Density ◽  
Laminated Composite ◽  
Target Material ◽  
Penetration Resistance ◽  
Initial Kinetic Energy ◽  
Foam Material ◽  
Expansion Theory ◽  
Cavity Expansion Theory

A theoretical study is presented herein on the perforation of the cone-nosed projectiles against bi-layered laminated composite aluminum alloy foam target. Bi-layered targets were arranged according to the mass density and thickness of foam material. The dynamic cavity expansion theory is applied to formulate analytical model. The perforating process can be divided into 8 stages. The analytical equations during every stage are derived to evaluate the final penetration depth and penetration resistance during the whole perforating process. Penetrating depths, velocity limits and residual velocity of projectile are analyzed. The effect of mass density of target material and the layer thicknesses on the penetration resistance and capacity of absorbing energy are investigated. The results demonstrate that configuration of laminated targets and the initial kinetic energy play important roles during the perforating processes.

Analysis on Perforation of Cone-Nose Projectile to Composite Laminated Aluminum Foam Target

2010 ◽  
Vol 29-32 ◽  
pp. 1844-1849
Author(s):  
Yong Gang Bao ◽  
Nian Mei Zhang ◽  
Xiao Peng Yan ◽  
Gui Tong Yang
Keyword(s):  
Aluminum Foam ◽  
Cone Angle ◽  
Target Material ◽  
Absorption Capacity ◽  
Energy Absorption Capacity ◽  
Composite Target ◽  
Expansion Theory ◽  
Cavity Expansion Theory ◽  
Half Cone ◽  
Resistance Expression

The perforation of composite laminated aluminum foam target against rigid projectiles is studied. The dynamic cavity expansion theory is applied to formulate analytical model and study the perforation resistance of the projectiles. The perforation process can be divided into 11 stages. The perforation resistance expression is derived and applied to analyze the penetration depth of cone-nosed projectiles into the aluminum foam target. The velocity limit and residual velocity are obtained by solving the series of motion equations. The effects of initial velocity, the half-cone angle of the projectile, the density and thickness of each layer on the penetration resistance are investigated. The energy absorption capacity of the composite target material is evaluated.

Behavior of oil-based modeling clay at medium strain rates

2021 ◽  
pp. 154851292110497
Author(s):  
Camilo Hernandez ◽  
Mario F Buchely ◽  
Juan P Casas-Rodriguez ◽  
Alejandro Maranon
Keyword(s):  
Element Model ◽  
Strain Rates ◽  
Material Parameters ◽  
Expansion Theory ◽  
The Difference ◽  
Cavity Expansion Theory ◽  
Good Concordance ◽  
Constitutive Parameters ◽  
Penetration Profile ◽  
Modeling Clay

The modeling clay is an oil-based soft, flowable, and pliable material made from waxes and oils. Besides its primary use for making sculptures, the modeling clay is commonly used to evaluate bulletproof vests and simulate metal manufacturing processes by conformation. In ballistic tests, the clay is used to retain the deformation of the rear face of body armors; and in the study of metal forming processes, it is used as a physical model to provide information on the plastic flow. However, its mechanical dynamic behavior is not entirely understood. In this study, Plastilina Roma No. 1 modeling clay was mechanically characterized using the power-law constitutive model at medium strain rates [Formula: see text]. The material parameters were determined using a penetration model based on the Cavity Expansion Theory and an inverse technique involving the comparison of the model with experimentation. The optimum set of constitutive parameters was found by reducing the difference of the calculated penetration profile and the measurements from a drop test. This optimization process was programmed on the MATLAB–Simulink environment. The determined material parameters were validated by comparing the results from a computational model with three test set-ups. Finite element model results show good concordance with experimental measurements.

scholarly journals Improving Interlaminar Fracture Toughness and Impact Performance of Carbon Fiber/Epoxy Laminated Composite by Using Thermoplastic Fibers

Molecules ◽  
2019 ◽  
Vol 24 (18) ◽  
pp. 3367 ◽  
Author(s):  
Ling Chen ◽  
Li-Wei Wu ◽  
Qian Jiang ◽  
Da Tian ◽  
Zhili Zhong ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Laminated Composite ◽  
Areal Density ◽  
Low Velocity Impact ◽  
Interlaminar Fracture Toughness ◽  
Low Velocity ◽  
Velocity Impact ◽  
Interlaminar Fracture ◽  
Impact Performance ◽  
Carbon Fiber Epoxy

The effects of thermoplastic polyimide (PI) and polypropylene (PP) fibers and areal density of toughened layer on interlaminar fracture toughness and impact performance of carbon fiber/epoxy (CF/EP) laminated composites were studied. Mode I interlaminar fracture toughness (GIC) was analyzed via double cantilever beam (DCB) tests. When comparing for the toughener type, PI played a positive role in enhancing the mode-I fracture toughness, while PP was not effective due to the less fiber bridge formed during composite curing. The toughening effects of areal density of PI were further investigated by end notched flexure (ENF) testing and low velocity impact testing to better understand the toughening mechanisms. The results revealed that the toughening effect reached its best effectiveness when the areal density of toughened layer was 30 g/m2. Compared with the control group, GIC and GIIC of CF/EP laminated composite were increased by 98.49% and 84.07%, and Fmax and Ee were enhanced by 92.38% and 299.08% under low velocity impact. There is no obvious delamination phenomenon on the surface of laminates after low velocity impact, indicating the improved interlaminar and impact performance of laminated composite.

Test Method of the εrms-N Curves of Laminated Composite Beams

2008 ◽  
Vol 44-46 ◽  
pp. 311-316
Author(s):  
Chuang Shao ◽  
Sen Ge ◽  
Hua Tao ◽  
Claude Bathias
Keyword(s):  
Resonance Frequency ◽  
Fatigue Test ◽  
Laminated Composite ◽  
Test Method ◽  
Cantilever Beams ◽  
Test Results ◽  
Vibration Fatigue ◽  
The Difference ◽  
Double Cantilever Beams ◽  
Laminated Composite Beams

Two kinds of beam specimens made of composite laminated panel were designed and used to do vibration fatigue test for ε-N curves. the shapes of various simulated joint configurations for the specimens were adopted in order to get the accurate results. They were two kinds of double-cantilever beams supplied by T-mode stiffener and L-mode stiffener. All beam specimens were tested under the same shape of narrowband spectrum and the several loadings of random vibration by shaker excitation. The bandwidth of the narrowband random spectrum was 1/3 octave bandwidth whose centre frequency was the first resonance frequency of the cantilever beam, so that it reduced influences of the difference of specimens resonance frequency. Fitting vibration fatigue test results, the ε-N curves would be obtained then. The vibration test shows that this method of getting ε-N vibration curve is feasible. It can be used in practice.

Modified Mechanical Model of Normal Penetration of Rigid Projectiles into an Aluminum Target

2011 ◽  
Vol 323 ◽  
pp. 103-108
Author(s):  
Guang Yan Huang ◽  
Guang Wu ◽  
Shun Shan Feng
Keyword(s):  
Sliding Friction ◽  
Plate Thickness ◽  
Impact Resistance ◽  
Target Material ◽  
Correction Method ◽  
Mechanical Analysis ◽  
Analysis Model ◽  
Rigid Projectile ◽  
Expansion Theory ◽  
Cavity Expansion Theory

Three-stage model of normal penetration of rigid projectile into aluminum plate is developed base on cavity expansion theory (plate thickness is smaller than projectile nose length). Correction method of the models is proposed and predicted results have good agreement with experimental data. The influence of target’s yield stress, target material parameter, sliding friction coefficient and projectile nose shape to penetration process is analyzed through numerical solution. It provides an effective mechanical analysis model for research of projectile impact resistance method to aluminum protective structure.

Sign in / Sign up

Export Citation Format

Share Document