Impact behavior of natural rubber based syntactic foam core sandwich structures

2021 ◽  
Vol 63 (11) ◽  
pp. 1052-1057
Author(s):  
Harun Güçlü ◽  
Hasan Kasım ◽  
İ. Kürşad Türkoğlu ◽  
Yücel Can ◽  
Murat Yazıcı
Keyword(s):  
Finite Element ◽  
Boundary Conditions ◽  
Natural Rubber ◽  
Adhesive Bonding ◽  
Syntactic Foam ◽  
Sandwich Panels ◽  
Impact Behavior ◽  
Foam Core ◽  
Element Analysis ◽  
The Impact

Abstract In this study, the impact behavior of sandwich panels of natural rubber-based syntactic foam cores with aluminum face sheets was investigated experimentally and with the help of finite element analysis (FEA). Syntactic foam cores were produced byadding glass bubbles (GB) to the natural rubber (NR). Natural rubber was dissolved at room temperature with chemical solvents mixed with glass bubbles at 10, 20, and 30 weight percentages. Very low density (~0.8 g × cm-3) and high compressible foams were obtained depending on the GB weight percentages. Aluminum face sheets and the NR/GB syntactic foam core developed were joined by adhesive bonding to produce sandwich beam specimens. The sandwich beams manufactured in this way were subjected to impact loading under three-point bending boundary conditions experimentally. The experimental results were compared with finite element simulation results under the same loading and boundary conditions. The damage mechanism of the sandwich panels devised were analyzed. According to the results, natural rubber containing an additive of 20 wt.-% GBs showed better impact resistance than the others.

Low-velocity impact properties and finite element analysis of syntactic foam reinforced by warp-knitted spacer fabric

2016 ◽  
Vol 87 (16) ◽  
pp. 1938-1952 ◽  
Author(s):  
Chao Zhi ◽  
Hairu Long ◽  
Fengxin Sun
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Syntactic Foam ◽  
Low Velocity Impact ◽  
Low Velocity ◽  
Element Analysis ◽  
Velocity Impact ◽  
Impact Performance ◽  
Spacer Fabric ◽  
The Impact

The aim of this research was to investigate the low-velocity impact properties of syntactic foam reinforced by warp-knitted spacer fabric (SF-WKSF). In order to discuss the effect of warp-knitted spacer fabric (WKSF) and hollow glass microballoon parameters on the impact performance of composites, eight different kinds of SF-WKSF samples were fabricated, including different WKSF surface layer structures, different spacer yarn diameters and inclination-angles, different microballoon types and contents. The low-velocity impact tests were carried out on an INSTRON 9250 HV drop-weight impact tester and the impact resistances of SF-WKSF were analyzed; it is indicated that most SF-WKSF specimens show higher peak impact force and major damage energy compared to neat syntactic foam. The results also demonstrate that the surface layer structure, inclination-angle of the spacer yarn and the volume fraction and type of microballoon have a significant influence on the low-impact performance of SF-WKSF. In addition, a finite element analysis finished with ANSYS/LS-DYNA and LS-PrePost was used to simulate the impact behaviors of SF-WKSF. The results of the finite element analysis are in agreement with the experimental results.

scholarly journals Simulation of Low Velocity Impact on Composite Hemispherical Shell

2014 ◽  
Vol 564 ◽  
pp. 406-411
Author(s):  
Parnia Zakikhani ◽  
R. Zahari ◽  
Mohamed Thariq Hameed Sultan
Keyword(s):  
Finite Element ◽  
Energy Absorption ◽  
Experimental Testing ◽  
Low Velocity Impact ◽  
Impact Behavior ◽  
Low Velocity ◽  
Element Analysis ◽  
Velocity Impact ◽  
Hemispherical Shell ◽  
The Impact

Impact simulation with finite element analysis is an appropriate manner to reduce the cost and time taken to carry out an experimental testing on a component. In this study, the impact behavior of the composite hemispherical shell induced by low velocity impact is simulated in ABAQUS software with finite element method. To predict the responses of Kevlar fabric/polyester, glass fabric/polyester and carbon fabric/polyester in the form of a hemisphere, once as one layer and then as a three-layered composite under applied force by an anvil. The sequences of layers are changed, to investigate and compare the occurred alternations in the amount of energy absorption, impact force and specific energy absorption (SEA). The comparison of results showed that the highest and the lowest quantity of energy absorption and SEA belong to Carbon/Glass/Kevlar (CGK) and Kevlar/Carbon/Glass (KCG) respectively.

scholarly journals Finite Element Analysis of Load Bearing Capacity of a Reinforced Concrete Frame Subjected to Cyclic Loading

2016 ◽  
Vol 2 (5) ◽  
pp. 221-225 ◽  
Author(s):  
Mahdi Bamdad ◽  
Abdolreza Sarvghad Moghadam ◽  
Mohammad Javad Mehrani
Keyword(s):  
Finite Element ◽  
Bearing Capacity ◽  
Impact Behavior ◽  
Reinforced Concrete Frame ◽  
Load Bearing Capacity ◽  
Element Analysis ◽  
Load Bearing ◽  
Concrete Frame ◽  
The Impact ◽  
Abaqus Software

Many methods have been developed in order to study the impact behavior of solids and structures. Two common methods are finite element and experimental method. The nonlinear finite element method is one the most effective methods of predicting the behavior of RC beams from zero-load to failure and its fracture, yield and ultimate strengths. The advantage of this method is its ability to make this prediction for all sections of the assessed RC beam and all stages of loading. This paper compares the experimental results obtained for a RC frame with the numerical results calculated by ABAQUS software, and plots both sets of results as hysteresis–displacement diagrams. This comparison shows that the numerical FEM implemented via ABAQUS software produce valid and reliable results for load bearing capacity of RC frames subjected to cyclic loads, and therefore has significant cost and time efficiency advantages over the alternative approach

Multiaxial Impact Behavior and Modeling of ABS Polymer

2001 ◽  
Author(s):  
A. Saigal ◽  
R. Greif ◽  
Y. Duan ◽  
M. A. Zimmerman
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Strain Rate ◽  
Impact Load ◽  
Mechanical Test ◽  
Impact Behavior ◽  
Analysis Model ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
The Impact

Abstract The multiaxial impact behavior of CYCOLAC GPM5500 (ABS glassy polymer) is obtained as a function of impact velocity and temperature from the standard impact test as specified by ASTM D3763. Finite element analysis (FEA) and ABAQUS/Explicit are used to model the impact behavior of the polymer. The generalized “DSGZ” constitutive model, previously developed by the authors and calibrated using low strain rate uniaxial mechanical test data, is extended to the high strain rate regime and used in the finite element analysis. Load-displacement curves from the finite element analysis are compared with the experimental data and agree well up to the maximum impact load (failure). Therefore, the proposed finite element analysis model can be used to predict the multiaxial impact behaviors of polymers at different temperatures and impact velocities.

Wrinkling in sandwich panels – an analytical approach

2011 ◽  
Vol 13 (6) ◽  
pp. 705-730 ◽  
Author(s):  
Vitaly Koissin ◽  
Andrey Shipsha ◽  
Vitaly Skvortsov
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Analytical Approach ◽  
Local Buckling ◽  
Finite Size ◽  
Sandwich Panels ◽  
Good Precision ◽  
Foam Core ◽  
Element Analysis ◽  
Honeycomb Cores

This article deals with theoretical modeling of the local buckling in foam–core sandwich panels. This phenomenon is considered mainly in the periodic (unbounded wrinkle wave) and linearly elastic formulation. The analytical solutions are in agreement with results of finite element analysis and can be applied with a good precision for many finite-size panels, as well as for many sandwiches having honeycomb cores.

Impact Behavior Analysis of PC/ABS (50/50) Blends

2005 ◽  
Vol 297-300 ◽  
pp. 1297-1302 ◽  
Author(s):  
M. Nizar Machmud ◽  
Masaki Omiya ◽  
Hirotsugu Inoue ◽  
Kikuo Kishimoto
Keyword(s):  
Finite Element ◽  
Friction Coefficient ◽  
Impact Test ◽  
Large Strain ◽  
Rubber Particle ◽  
Particle Diameter ◽  
Polymeric Materials ◽  
Impact Behavior ◽  
Element Analysis ◽  
The Impact

Impact behavior of simply-supported circular thin plates made of PC/ABS (50/50) blends tested at room temperature by use of instrumented drop weight impact apparatus under different speeds: 2, 3, and 4m/sec has been studied. The blends have 10wt% content of rubber with rubber particle diameter of 270nm and of 150-170nm distributed in ABS. Features of the target are viewed to describe definite alteration of the plates induced by a hemispherical tip-ended cylindrical impactor and effect of rubber particle size distributed in the blends. It was found that the blends with a rubber particle diameter of 150-170nm were not in shattering and exhibited a unique crack shape at speed of 3m/sec. Simulation of the impact test was also performed using dynamic explicit finite element code of MSC. Dytran. In the simulation, the material was assumed isotropic and mass served as a rigid surface and an available material model in the finite element system, called piecewise linear plasticity, referring to a yield model of the von Mises was applied in the simulation for describing the large strain, non-linear behavior of the polymeric materials. Maximum plastic strain failure criterion was then used to simulate the impact failure. Contact between the impactor and the plate was applied and friction coefficient µ between the impactor and the plate was neglected. In order to study effect of friction coefficient value, additional simulation of the impact test has also been performed using µ = 0.3. Impact force-time histories of the blends obtained from the simulation were then verified to the impact test results and pointed out an evaluation of the use of the finite element analysis for predicting behavior of the blends under the impact loading.

Finite element analysis of indentation of aluminium foam and sandwich panels with aluminium foam core

2014 ◽  
Vol 599 ◽  
pp. 125-133 ◽  
Author(s):  
A. Xu ◽  
T. Vodenitcharova ◽  
K. Kabir ◽  
E.A. Flores-Johnson ◽  
M. Hoffman
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Sandwich Panels ◽  
Aluminium Foam ◽  
Foam Core ◽  
Element Analysis

Finite Element Analysis of Transverse Impact on a Woven Textile

2004 ◽  
Author(s):  
Yiping Duan ◽  
Michael Keefe ◽  
Travis A. Bogetti ◽  
Brian Powers
Keyword(s):  
Finite Element ◽  
Failure Modes ◽  
High Strength ◽  
Theoretical Work ◽  
Impact Behavior ◽  
Transverse Impact ◽  
Element Analysis ◽  
Distribution Energy ◽  
The Impact ◽  
Woven Textile

High-strength textiles are widely used in soft impact threat shield systems. During the past several decades, a lot of experiments and theoretical work were conducted to understand the transverse impact behavior of textile structures. As a continuation of those efforts, this paper presents finite element modeling of transverse impact of a rigid right circular cylinder into a square patch of plain-woven textile. Two boundary conditions are applied on the woven textile: four edges clamped; two opposite edges clamped and the other two edges left free. Results show that during the initial stage of the impact, there exists an abrupt momentum/energy transfer from the projectile to the local textile in the impact region. The modeling results also show that the textile boundary condition plays an important role in the impact. It significantly affects the textile transient deformation, stress distribution, energy absorption, and failure modes. The textile absorbs energy more quickly when all its four edges are clamped.

scholarly journals Potential and limitations of finite element modelling in assessing structural integrity of coralline algae under future global change

2015 ◽  
Vol 12 (19) ◽  
pp. 5871-5883 ◽  
Author(s):  
L. A. Melbourne ◽  
J. Griffin ◽  
D. N. Schmidt ◽  
E. J. Rayfield
Keyword(s):  
Climate Change ◽  
Finite Element ◽  
Structural Integrity ◽  
Geometric Model ◽  
Algal Growth ◽  
Coralline Algae ◽  
Rocky Shores ◽  
Element Analysis ◽  
Scan Data ◽  
The Impact

Abstract. Coralline algae are important habitat formers found on all rocky shores. While the impact of future ocean acidification on the physiological performance of the species has been well studied, little research has focused on potential changes in structural integrity in response to climate change. A previous study using 2-D Finite Element Analysis (FEA) suggested increased vulnerability to fracture (by wave action or boring) in algae grown under high CO2 conditions. To assess how realistically 2-D simplified models represent structural performance, a series of increasingly biologically accurate 3-D FE models that represent different aspects of coralline algal growth were developed. Simplified geometric 3-D models of the genus Lithothamnion were compared to models created from computed tomography (CT) scan data of the same genus. The biologically accurate model and the simplified geometric model representing individual cells had similar average stresses and stress distributions, emphasising the importance of the cell walls in dissipating the stress throughout the structure. In contrast models without the accurate representation of the cell geometry resulted in larger stress and strain results. Our more complex 3-D model reiterated the potential of climate change to diminish the structural integrity of the organism. This suggests that under future environmental conditions the weakening of the coralline algal skeleton along with increased external pressures (wave and bioerosion) may negatively influence the ability for coralline algae to maintain a habitat able to sustain high levels of biodiversity.

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