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Viscoelastic Analysis of Composite Flywheels for Energy Storage
Viewed 395 times since Sun, Jan 29, 2012
A viscoelastic analysis has been developed to investigate stress relaxation and creep in a multilayered composite cylinder subjected to rotation. The analysis accounts for ply-by-ply variation of material properties, fiber orientations, and density... Read More
The effect of edge interlaminar stresses on the strength of carbon/epoxy laminates of different stacking geometry
Viewed 343 times since Thu, Jul 26, 2012
The effect of edge interlaminar stresses on strength of carbon/epoxy laminates of different stacking geometry: cross-ply, quasi-isotropic and angle-ply laminates with additional 0º and 90º ply was studied. Coupons with two widths of laminates with... Read More
The effect of edge interlaminar stresses on the strength of carbon-epoxy laminates of different stacking geometry
Viewed 302 times since Fri, Sep 6, 2013
The effect of edge interlaminar stresses on strength of carbon/epoxy laminates of different stacking geometry: cross-ply, quasi-isotropic and angle-ply lami- nates with additional 0º and 90º ply was studied. Coupons with two widths of lami- nates... Read More
The application of residual stress tailoring of snap-through composites for variable sweep wings
Viewed 400 times since Wed, May 16, 2012
In this paper an alternative design for variable sweep wings is investigated. It consists of a two-spar, CFRP (carbon fibres reinforced plastics) wing, with truss-like ribs. The spar-web is a shell structure laminated using an unsymmetric stack... Read More
STRESS ANALYSIS OF LAMINATED COMPOSITE CYLINDERS UNDER NON-AXISYMMETRIC LOADING
Viewed 363 times since Sun, Jun 16, 2013
The use of thick-walled composite cylinders in structural applications has seen tremendous growth over the last decade.  Applications include pressure vessels, flywheels, drive shafts,  spoolable tubing, and production risers.  In... Read More
STRESS ANALYSIS OF CIRCUiAR SEMIMONOCOQUE CYLINDERS WITH CUTOUTS
Viewed 326 times since Sun, Jan 6, 2013
A method is presented for analyzing the stresses about cutouts in circular semimonocoque cylinders with flexible rings. The method involves the use of so-called perturbation stress distributions which are superposed on the stress distribution that... Read More
STRESS ANALYSIS OF A RADIAL NOZZLE ATTACHED TO A CYLINDRICAL SHELL UNDER INTERNAL PRESSURE
Viewed 264 times since Sun, Jun 16, 2013
An analytical method for the determination of stresses in the region of intersection of a  thin-walled composite shell made from two right circular cylinders intersecting with axes perpendicular and subjected to internal pressure is presented.... Read More
Stress Analysis in an Unidirectional Carbon/Epoxy Composite Material
Viewed 507 times since Tue, May 7, 2013
In this paper the stresses in the models from unidirectional carbon/epoxycomposite material are studied. Software packages, based on the Finite Element Method (FEM), can be used in order to predict stress distribution on the examinated model. In that... Read More
Strength prediction of multi-layer plain weave textile composites using the direct micromechanics method
Viewed 300 times since Tue, May 7, 2013
Previously developed micromechanical methods for stiffness and strength prediction are adapted for analysis of multi-layer plain weave textile composites. Utilizing the direct micromechanics method (DMM) via finite element modeling, three methods are... Read More
Stacking sequences for Extensionally Isotropic, Fully Isotropic and Quasi-Homogeneous Orthotropic Laminates
Viewed 327 times since Sun, Oct 28, 2012
The coupling behavior, which is dependent on the form of the elements in each of the extensional (A), coupling (B) and bending (D) stiffness matrices is now described by an extended subscript notation, defined previously by the Engineering Sciences... Read More
Separation of Crack Extension Modes in Orthotropic Delamination Models
Viewed 412 times since Sun, Aug 21, 2011
In the analysis of an interface crack between dissimilar elastic materials, the mode of crack extension is typically not unique, due to oscillatory behavior of near-tip stresses and displacements. This behavior currently limits the... Read More
Residual Stress Analysis of Graphite-Polymer Composites using the Concept of Metallic Inclusions
Viewed 270 times since Thu, Dec 6, 2012
Metal particles (Al, Ag, Nb) were embedded between the first and second plies of 6-ply unidirectional and 4-ply S-harness satin weave cloth carbon/polyimide laminates, as strain sensors for the determination of residual and applied stresses by x-ray... Read More
OUT OF PLANE ANALYSIS FOR COMPOSITE STRUCTURES
Viewed 327 times since Thu, Jan 3, 2013
The ability to predict stresses and failures due to out of plane loads has gained importance as airframe manufacturers begin to use integral (cocured or bonded) composite structures to maximize performance by minimizing weight. Rapid and accurate... Read More
Nonlinear Analysis of Fiber-Reinforced Composite Laminates Subjected to Uniaxial Tensile Load
Viewed 163 times since Fri, May 1, 2015
A nonlinear constitutive model together with a mixed failure criterion for a single lamina is developed to simulate the behavior of composite laminates under uniaxial tension. In the model, fiber and matrix are assumed to behave elastic–plastic and... Read More
Laminate Analysis
Viewed 427 times since Sat, Jun 9, 2012
The proper selection of the placement angle of the different layers of fiber is a key feature in the design of composite structures. In fiber  composites, the stiffness of the individual plies depend on the angles of fiber placement with respect... Read More
LAMINA ANALYSIS
Viewed 391 times since Sat, Jun 9, 2012
One difference between laminated composites and traditional engineering materials is that a composite’s response to loads is direction dependent. In order to analyze the response of a composite, we must be able to predict the behavior of... Read More
Inelastic Deformation of Composite Materials
Viewed 353 times since Thu, Oct 18, 2012
The dominant compressive failure mechanism of modern fibre composites is microbuckling. This is demonstrated in the form of a fracture map. For polymer matrix composites microbuckling is a plastic event. An analysis is presented of both elastic and... Read More
Image Correlation Analysis Applied to Measurement of Shear Strains in Laminated Composites
Viewed 462 times since Tue, Jul 31, 2012
Digital Image Correlation (DIC) was applied to measure interlaminar shear strains in fiber reinforced polymer composites. The strain field of short-beam shear test specimens was characterized. E-glass / vinyl ester laminates fabricated by the resin... Read More
Free edge delamination in carbon-epoxy laminates-a novel numerical and experimental approach
Viewed 216 times since Fri, Sep 6, 2013
A geometrically and physically nonlinear finite element approach is presented for  the  analysis of  mode-l  and  mixed-mode free  edge  delamination in composite laminates which properly accounts for the effects of... Read More
Expanding the capabilities of the Ten-Percent Rule for predicting the strength of fibre–polymer composites
Viewed 320 times since Tue, Apr 10, 2012
The Ten-Percent Rule, for predicting the strength and stiffness of fibre–polymer composites on the basis of simple rule-of mixtures formulae, is here extended beyond its prior restriction to only fibre patterns in the 0,45,90 family of balanced... Read More
Exact Solution for Functionally Graded Anisotropic Elastic Composite Laminates
Viewed 382 times since Tue, Apr 10, 2012
Exact solutions are derived for three-dimensional, anisotropic, linearly elastic, and functionally graded rectangular composite laminates under simply supported edge conditions. The solutions are expressed in terms of an elegant formalism that... Read More
Estimation of transverse/interlaminar stresses in laminated composites ± a selective review and survey of current developments
Viewed 490 times since Tue, Apr 3, 2012
A review is made on the di€erent methods used for the estimation of transverse/interlaminar stresses in laminated composite plates and shells. Both analytical and numerical methods are considered. In numerical methods while the emphasis is given on... Read More
Estimation of transverse-interlaminar stresses in laminated composites - a selective review and survey of current developments
Viewed 243 times since Sun, Sep 1, 2013
A review is made on the different methods used for the estimation of transverse linterlaminar stresses in laminated composite plates and shells. Both analytical and numerical methods are considered. In numerical methods while the emphasis is given on... Read More
Elements of Automated Aeroelastic Analysis in Aircraft Preliminary Design
Viewed 299 times since Sun, Mar 4, 2012
In most cases the overall aircraft design process can be subdivided into three parts [1]: conceptual, preliminary and detailed. Different from the detailed design phase, where a configuration has already been defined and prototyped, the most crucial... Read More
Elastic-plastic stress analysis of a thermoplastic composite disc under parabolic temperature distribution
Viewed 383 times since Sun, Mar 4, 2012
In this study, an elastic-plastic thermal stress analysis was carried out on a steel fiber reinforced thermoplastic composite disc under a parabolic temperature distribution. The thermal elastic and elastic-plastic solutions were obtained both... Read More
Elastic Tailoring of a Composite D-Spar
Viewed 719 times since Sun, Mar 4, 2012
There are many potential benefits to be gained from the aeroelastic behavior of a windturbine blade with bend-twist coupling. However, the ability to manufacture blades with sufficient coupling to provide the desired benefits has yet to be... Read More
Effect of Orientation on Stiffness of Aligned Fibre Composites
Viewed 326 times since Sun, Feb 12, 2012
In this section we are going to look at the effect of loading a composite in a direction that is neither parallel nor perpendicular to the fibres. This not easy and will make extensive use of the tensor representation of stress and strain in both 2-... Read More
Dislocation-Based Deformation Mechanisms in Metallic Nanolaminates
Viewed 632 times since Sat, Jan 7, 2012
The appeal of nanolaycred materials from a mechanical viewpoint is that, in principle, plastic deformation can be confined to small volumes of material by controlling both the frequency and magnitude of obstacles to dislocation motion. Read More
DEVELOPMENT OF ANALYSIS METHODS FOR DESIGNING WITH COMPOSITES
Viewed 343 times since Thu, Jan 5, 2012
We developed a complex variational formulation to analyze the in-plane and bending coupling response of an unsymmetrically laminated plate with an elliptical cutout subjected to arbitrary edge loading as shown in Figure 1. This formulation utilizes... Read More
Determination of the Shear Stress Distribution in a Laminate From the Applied Shear Resultant—A Simplified Shear Solution
Viewed 135 times since Wed, Mar 23, 2016
The "simplified shear solution” method is presented for approximating the through-thickness shear stress distribution within a composite laminate based on laminated beam theory. The method does not consider the solution of a particular boundary... Read More
Delamination
Viewed 308 times since Thu, Oct 18, 2012
Interlaminar stress in composite structures usually results from the mismatch of engineering properties between plies. These stresses are the underlying cause of delamination initiation and propagation. Delamination is defined as the cracking of the... Read More
COMPOSITE STRESS METHODS TO USE FOR A380 FLE AND FTE CHECKSTRESS AND SUPPORTABILITY CALCULATIONS
Viewed 953 times since Sat, Nov 26, 2011
The following are examples of how non-standard panels should be idealised for buckling and other calculations. Terms "a” and "b” are assigned following the AUK CSM such that the direction of principle loading coincides with "b” with exception... Read More
Composite Failure Analysis Handbook Update #1
Viewed 517 times since Fri, Nov 11, 2011
This report supplements the data and analyses provided in the previously released "Composite Failure Analysis Handbook," Wl-TR-91-4032. It contains fractographic data from failed composite test specimens as well as case histories of failed... Read More
Composite angle ply laminates and netting analysis
Viewed 675 times since Tue, Nov 8, 2011
This paper relates to the ‘netting-analysis’ approach, often used in calculations of the behaviour of helically wound reinforced pressure vessels and tubes. Numerical calculation of the stress–strain relations for angle ply... Read More
Apparent elastic and elastoplstic behavior of periodic composites
Viewed 314 times since Sat, Oct 8, 2011
Investigation of scale and boundary condition effects on the elastic and elastoplastic behavior of periodic fiber-reinforced composites. Read More
Analyzing Laminated Structures from Fibre-Reinforced Composite Material – An Assessment
Viewed 293 times since Sat, Oct 8, 2011
In the open literature there is available a tremendous number of models and methods for analyzing laminated structures. With respect to the assumptions across the laminate thickness, theories with Cz1-continuous functions are to be distinguished from... Read More
ANALYSIS OF WOVEN FABRICS FOR REINFORCED COMPOSITE MATERIALS
Viewed 389 times since Thu, Oct 6, 2011
A courtship is in progress between the centuries-old technology of textiles and the decades-old technology of composites. Stimulated initially by potential economies offered by the ease of handling stable, woven constructions (to... Read More
ANALYSIS OF THIN-WALLED ANISOTROPIC FRAMES BY THE DIRECT STIFFNESS METHOD
Viewed 494 times since Thu, Oct 6, 2011
The stiffness matrix for a one-dimensional beam element for use in a direct stiffness matrix method for analysing thin-walled anisotropic frames is presented in this paper. Thin-walled beams are widely used as structural components and... Read More
Analysis of Thick Skew Laminate with Elliptical Cutout Subjected to Non-Linear Temperature Distribution: Major Axis of Ellipse Horizontal
Viewed 380 times since Thu, Oct 6, 2011
The thermoelastic behaviour of a cross-ply laminated composite skew plate with elliptical cutout subjected to non-linearly varying temperature loading has been investigated in the present analysis. Major axis of the ellipse parallel to... Read More
Analysis of Thick Skew Laminate with Elliptical Cutout Subjected to Non-Linear Temperature Distribution : Major Axis of Ellipse Vertical
Viewed 370 times since Thu, Oct 6, 2011
Materials are put to serious test when they are subjected to elevated temperatures. Estimation of thermal stresses and deformations of fiber reinforced composite plates is more complex owing to material anisotropy. Hence an effort is... Read More
ANALYSIS OF LAMINATED BEAMS AND PLATES
Viewed 526 times since Tue, Apr 3, 2012
Fiber composites are often used in the form of beam or plate structures. The analysis of composite beams or plates follows the basic fundamentals as usually presented in strength-of-materials texts for beams and plates of isotropic materials (e.g.... Read More
Analysis of Interlaminar Stresses in Thick Composite Laminates with and without edge Delamination
Viewed 423 times since Thu, Oct 6, 2011
The effect of laminate thickness on the interlaminar stresses in rectangular quasi-isotropic laminates under unifrom axial strain was studied. Read More
Analysis of Composite Panel-Stiffener Debonding Using a Shell/3D Modeling Technique
Viewed 469 times since Wed, Oct 5, 2011
Interlaminar fracture mechanics has proven useful for characterizing the onset of delaminations in composites and has been used with limited success primarily to investigate onset in fracture toughness specimens and laboratory size coupon... Read More
Analysis of Composite Laminates using Graphical Processing
Viewed 426 times since Wed, Oct 5, 2011
The increased usage of advanced fibrous composite materials in structural engineering has made mandatory the development of computational models for their analysis. Read More
Analysis of composite hydrogen storage cylinders subjected to localized flame impingements
Viewed 404 times since Mon, Oct 3, 2011
A comprehensive non-linear finite element model is developed for predicting the behavior of composite hydrogen storage cylinders subjected to high pressure and localized flame impingements. The model is formulated in an axi-symmetric... Read More
Analysis and Design of Variable Stiffness Composite Cylinders
Viewed 268 times since Wed, Oct 8, 2014
An investigation of the possible performance improvements of thin circular cylindrical shells through the use of the variable stiffness concept is presented. The variable stiffness concept implies that the stiffness parameters change spatially... Read More
An Efficient Stress Function Approximation for the Free- Edge Stresses in Laminates
Viewed 382 times since Fri, Sep 30, 2011
A solution method is derived for determining the free-edge stresses in composite laminates. The method is based on expanding stress functions in terms of a harmonic series in the thickness direction. Using the principle of minimum... Read More
An Approximate Solution for Interlaminar Stresses in Laminated Composites
Viewed 382 times since Fri, Sep 30, 2011
An approximate solution for interlaminar stresses in finite width, laminated composites subjected to uniform extensional and bending loads is presented. The solution is based upon the principle of minimum complementary energy and an assumed... Read More
A two variable refined plate theory for orthotropic plate analysis
Viewed 246 times since Sun, Aug 16, 2015
A new theory, which involves only two unknown functions and yet takes into account shear deformations, is presented for orthotropic plate analysis. Unlike any other theory, the theory presented gives rise to only two governing equations, which... Read More
A PSEUDO STRENGTH FUNCTION FOR THE GENERATION OF LOCAL LAMINATE REINFORCEMENT DOUBLERS
Viewed 129 times since Mon, Feb 16, 2015
Due to their superior mass-specific mechanical properties, laminated composite structures are today well established for aircraft and spacecraft applications. The possibility to tailor the properties of laminates to local requirements at different... Read More
A MACRO-MICROMECHANICS A NOTCHED METAL MATRIX ANALYSIS OF COMPOSITE
Viewed 385 times since Wed, Aug 31, 2011
A macro-micromechanics analysis was formulated to determine the matrix and fiber behavior near the notch tip in a center-notched metal matrix composite. Results are presented for a boron/aluminum mono]ayer. The macrolevel analysis models... Read More
A GENERAL SUBLAMINATE ANALYSIS METHOD FOR DETERMINING STRAIN ENERGY RELEASE RATES IN COMPOSITES
Viewed 502 times since Wed, Aug 31, 2011
A method is presented for computing strain energy- release-rates (SERR) for delamination growth in a wide variety of composite structures. The method is based on a sublaminate analysis which treats portions of a laminate as higher... Read More