Deformation Fields in Woven Composite Plates Under Impact

2002 ◽  
Author(s):  
Y. A. Bahei-El-Din ◽  
M. A. Zikry ◽  
A. Rajendran
Keyword(s):  
Structural Parameters ◽  
Composite Plates ◽  
Dynamic Contact ◽  
Element Model ◽  
Cellular Systems ◽  
Woven Composites ◽  
Porous System ◽  
Woven Composite ◽  
Dynamic Contact Problem ◽  
The Impact

The deformation fields and kinematics of woven composite material systems due to impact loads are analyzed and characterized for various structural parameters. Target plates comprised of woven composites with 3D preforms are considered. The analysis examines fully consolidated as well as cellular systems and simulates actual experiments. Solution of the nonlinear dynamic/contact problem was obtained by a meso-mechanics based finite element model. The results quantify experimental observations, which reveal distinct behavior under impact among nonporous and porous systems. It was found that wave propagation effects at incident energies in the order of 500 J are significant and lead to penetration at the impact face. Localized shear damage in the 3D woven system precede penetration in both the nonporous and the porous systems. The porous system is capable of dissipating more energy prior to penetration due to containment of local damage, which emanates from the void boundaries, within subsurface locations.

The Research of Structural Parameters on Natural Frequency of Laminated Composite Plates

2013 ◽  
Vol 740 ◽  
pp. 461-464
Author(s):  
Fei Zhao ◽  
Jin Wu Wu
Keyword(s):  
Natural Frequencies ◽  
Structural Parameters ◽  
Orientation Angle ◽  
Laminated Composite ◽  
Composite Plates ◽  
Element Model ◽  
Laminated Composite Plates ◽  
Laminated Composite Plate ◽  
Modulus Ratio ◽  
Depth Ratio

In this paper, natural frequencies of laminated composite plates were studied. The layerwise finite element model is imposed to determine the natural frequencies of laminated composite plates. The effects of panel orientation angle, elastic modulus ratio and width-depth ratio on the natural frequencies of the laminated composite are then discussed. With an example of a sixteen-laying laminated plate, the numerical simulations show that the factor of key structural parameters to the natural frequencies of the laminated composite plate is panel orientation angle and width-depth ratio.

Impact-Induced Damage Progression in 2-D and 3-D Woven Composite Systems

2001 ◽  
Author(s):  
Jared N. Baucom ◽  
Mohammed A. Zikry
Keyword(s):  
Failure Modes ◽  
Surface Condition ◽  
Woven Composites ◽  
Woven Composite ◽  
Additional Energy ◽  
3 Dimensional ◽  
Damage Progression ◽  
Glass Fiber Reinforced ◽  
The Difference ◽  
The Impact

Abstract The role of fabric architecture on the impact-induced damage progression and perforation resistance of glass-fiber reinforced vinyl-ester resin panels under dynamic loading condition is investigated. Three fabric preforms are considered: a 2-dimensional, plain-woven laminate, a commercially available biaxially reinforced warp-knit, and a 3-dimensional, orthogonally woven preform. Composite samples are subjected to multiple impacts, until perforation, and the impactor position and acceleration are monitored throughout each event, resulting in a visualization of dynamic energy dissipation. Failure modes of the various material systems are characterized. The radial damage expansion was smallest for the 2-d laminate, larger for the biaxially-reinforced warp-knit, and largest for the 3-d orthogonal woven composite. The 3-d composite survived more hits and dissipated more total energy than the other systems. The difference may be due to the additional energy absorption mechanisms, which involve the crimped portion of z-tows in the 3-d composites. This implies that failure may be controlled by manipulation of the properties of the z-tows. It also indicates that the surface condition of 3-d orthogonally woven composites can strongly affect the progression of impact-induced damage.

The Effect of the Structural Parameters of 3D Orthogonal Woven Composites on their Impact Responses under Different Modes of Impact

2018 ◽  
Vol 786 ◽  
pp. 215-223 ◽  
Author(s):  
Mohamad Midani ◽  
Abde Fattah Seyam ◽  
Mark Pankow
Keyword(s):  
Structural Parameters ◽  
Impact Resistance ◽  
Three Dimensional ◽  
Charpy Impact ◽  
Woven Composites ◽  
Weaving Technology ◽  
Impact Responses ◽  
3D Orthogonal Woven ◽  
The Impact ◽  
3D Weaving

Development of three-dimensional (3D) weaving technology introduced new and enhanced features to the 2D weaving technology. 3D Orthogonal Woven (3DOW) preforms have a through-thickness yarn component that significantly enhances the impact resistance and delamination resistance. In this study, a range of 3DOW E-glass preforms were woven using 3D weaving technology and then converted into composites, using vacuum assisted resin transfer molding technology. The composite samples had varying structural parameters, such as, number of Y-yarn layers, X-yarn pick density, Z-yarn interlacing pattern. The purpose was to study the effect of changing those structural parameters on the different impact responses of the 3DOW composites under different modes of impact, namely, tup, Izod and Charpy impact. The study indicated that, the number of Y-yarn layers, had the most significant effect on the total tup, Izod, and Charpy impact energies. The X-yarn pick density, had slight effect on the three modes of impact, while the Z-yarn weave design only had a slight significant effect on the tup and Charpy impact energy.

scholarly journals A Parameterized Ultrasound-Based Finite Element Analysis of the Mechanical Environment of Pregnancy

2017 ◽  
Vol 139 (5) ◽  
Author(s):  
Andrea R. Westervelt ◽  
Michael Fernandez ◽  
Michael House ◽  
Joy Vink ◽  
Chia-Ling Nhan-Chang ◽  
...  
Keyword(s):  
Finite Element ◽  
Preterm Birth ◽  
Structural Parameters ◽  
Three Dimensional ◽  
Element Model ◽  
Cervical Length ◽  
Childhood Mortality ◽  
Cervical Canal ◽  
Element Analysis ◽  
The Impact

Preterm birth is the leading cause of childhood mortality and can lead to health risks in survivors. The mechanical functions of the uterus, fetal membranes, and cervix have dynamic roles to protect the fetus during gestation. To understand their mechanical function and relation to preterm birth, we built a three-dimensional parameterized finite element model of pregnancy. This model is generated by an automated procedure that is informed by maternal ultrasound measurements. A baseline model at 25 weeks of gestation was characterized, and to visualize the impact of cervical structural parameters on tissue stretch, we evaluated the model sensitivity to (1) anterior uterocervical angle, (2) cervical length, (3) posterior cervical offset, and (4) cervical stiffness. We found that cervical tissue stretching is minimal when the cervical canal is aligned with the longitudinal uterine axis, and a softer cervix is more sensitive to changes in the geometric variables tested.

Parameter Sensitivity and Reliability Analysis for Construction Control of Cable-Net Structure Supporting the Reflector of FAST

2013 ◽  
Vol 671-674 ◽  
pp. 529-533
Author(s):  
Xu Kong ◽  
Qi Ming Wang ◽  
Chuan Jia Liu ◽  
Zhong Yi Zhu
Keyword(s):  
Sensitivity Analysis ◽  
Global Sensitivity Analysis ◽  
Structural Parameters ◽  
Element Model ◽  
Parameter Sensitivity ◽  
Tension Force ◽  
Design Parameters ◽  
Structural Parameter ◽  
Global Sensitivity ◽  
The Impact

Five-hundred-meter Aperture Spherical radio Telescope (FAST) is supported by cable-net structure, which enables its surface to form a paraboloid in real time under active control. FAST is now entering project construction and implement stage, however there are always a considerable amount of errors existed in practice which would result in the deviation of the structure from its ideal model. Therefore, structural parameter sensitivity analysis was indispensable discussed. In the paper, the variation ranges of structural parameters were rationally determined. Base on local sensitivity analysis and global sensitivity analysis method, Using the finite element model investigated the influence of different structural parameters change on the static behavior, gets the conclusions that the impact of several key design parameters on the tension force of cable-net is large. The results indicate that of all types of the structural parameters, the error of the length of cable plays the most important role, and the global sensitivity analysis indicates that the tension force range of cable-net is -18% to 27%.

scholarly journals Impact Resistance of 3D Woven Composites Impacted by Different Impactor Shapes

2019 ◽  
Vol 7 (4.14) ◽  
pp. 449
Author(s):  
D. P.C. Aiman ◽  
M. F. Yahya ◽  
M. R. Ahmad ◽  
S. A. Ghani
Keyword(s):  
Impact Test ◽  
Impact Resistance ◽  
Woven Fabric ◽  
Woven Composites ◽  
Woven Composite ◽  
Fabric Composite ◽  
3D Woven Composites ◽  
Set Up ◽  
The Impact ◽  
Composite Samples

The aim of this study was to investigate impact resistance of 3D woven composites, impacted by three different impactor shapes. An experimental study was carried out to compare the impact resistance on four types of 3D woven fiberglass composites. Impact resistance test will be performed using standard method ASTM D2444, with a set up initial impact energy is 20 J, velocity of 3.4901 m/s, height of 0.6163m and mass applied is 3.29 kg. Three different impactor shapes which are hemispherical, conical and ogival were used for testing woven fabric composite impact test. Hand lay-up technique was used to fabricate the composites. From results, 4 float Layer-to-layer Interlock (4L) gave the highest impact resistance for all impactor shapes with 6258.0 N for hemispherical impactor, 4000.1 N for conical impactor and 3750.7 N for ogival impactor. Ogival impactor tends to penetrate the woven composite samples better compared to conical and hemispherical impactors. 

Fibre-Reinforced Polymers under Impact Load

2006 ◽  
Vol 326-328 ◽  
pp. 1563-1568 ◽  
Author(s):  
Ch.R. Koenig ◽  
D.H. Mueller ◽  
J. Mueller ◽  
Mircea Calomfirescu
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Impact Load ◽  
Composite Plates ◽  
Element Model ◽  
Structural Failure ◽  
Reinforced Polymers ◽  
The University ◽  
The Impact ◽  
The Finite Element Model

Structural failure of fibre-reinforced polymers (FRP) caused by impact is an important factor in product development for the aircraft industry. Therefore it is necessary to obtain knowledge of the mechanisms and of the material loading during and shortly after an impact load. On account of this a Finite-Element-Model was developed with the goal to deduce design rules for impact tolerant composite materials. To verify and validate the Finite-Element-Model it is essential to have information of the state of stress on the surface of the FRP shortly after the impact. An impact test device was developed at the University of Bremen. The time variable, stress and strain conditions in composite plates are measured using photoelastic technique, strain gauges and holographic interferometry.

Effects of yarn defects and specimen size on impact compressive damages of 3-D angle interlock woven composites

2017 ◽  
Vol 27 (9) ◽  
pp. 1380-1396 ◽  
Author(s):  
Tao Liu ◽  
Baozhong Sun ◽  
Bohong Gu
Keyword(s):  
Finite Element ◽  
Size Effects ◽  
Element Model ◽  
Geometrical Model ◽  
Specimen Size ◽  
Woven Composites ◽  
Compressive Properties ◽  
Out Of Plane ◽  
The Impact ◽  
Random Defects

The objective of this work is to investigate yarn defects and specimen size on the impact compressive properties of 3-D angle interlock woven composites (AIWCs). The size effects on impact compressive properties were tested along in plane and out of plane directions. A new finite element model, with inherent defects in the geometrical model of yarns, was established to simulate impact compressive properties of the 3-D AIWCs. The model was further used to analyze size effects on impact compressive properties of 3-D AIWCs. We found the size effect on the 3-D AIWCs was not apparent both in experimental and numerical results; however, the random defects in yarns had a great effect on the compressive properties of 3-D AIWCs along different directions. The yarns effects will weaken the compressive stiffness and strength significantly.

Effect of long-term moisture exposure on impact response of glass-reinforced vinylester

2021 ◽  
pp. 147509022199616
Author(s):  
Fatemeh Alizadeh ◽  
Navid Kharghani ◽  
Carlos Guedes Soares
Keyword(s):  
Water Uptake ◽  
Failure Modes ◽  
Sea Water ◽  
Composite Plates ◽  
Impact Response ◽  
Low Velocity Impact ◽  
Water Type ◽  
Interfacial Damage ◽  
Impact Properties ◽  
The Impact

Glass/Vinylester composite laminates are comprehensively characterised to assess its impact response behaviour under moisture exposure in marine structures. An instrumented drop weight impact machine is utilised to determine the impact responses of dry and immersed specimens in normal, salted and sea water. The specimens, which had three different thicknesses, were subjected to water exposure for a very long period of over 20 months before tested in a low-velocity impact experiment. Water uptake was measured primarily to study the degradation profiles of GRP laminates after being permeated by water. Matrix dissolution and interfacial damage observed on the laminates after prolonged moisture exposure while the absorption behaviour was found typically non-Fickian. The weight of the composite plates firstly increased because of water diffusion up to month 15 and then decreased due to matrix degradation. The specimens with 3, 6 and 9 mm thickness exhibited maximum water absorption corresponding to 2.6%, 0.7% and 0.5% weight gain, respectively. In general, the results indicated that water uptake and impact properties were affected by thickness and less by water type. Impact properties of prolonged immersed specimens reduced remarkably, and intense failure modes detected almost in all cases. The least sensitive to impact damage were wet specimens with 9 mm thickness as they indicated similar maximum load and absorbed energy for different impact energies.

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