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VISCOUS DAMPING APPROXIMATION OF LAMINATED ANISOTROPIC COMPOSITE PLATES USING THE FINITE ELEMENT METHOD
Viewed 367 times since Sun, Jan 29, 2012
The main source of mechanical damping in laminated composite materials arises from the inelastic nature of the matrix and the relative slipping at the fiber/matrix interfaces. Damping in laminated composite materials is usually a function of many... Read More
Ultimate Strength Analysis of Stiffened Panels Subjected to Biaxial Thrust Using JTP and JBP Methods
Viewed 339 times since Sat, Feb 11, 2012
A series of ultimate strength analyses of stiffened panels subjected to biaxial thrust is performed using JTP method (PULS), JBP method (GL-formulae) and FEM, and the results are compared. The nonlinear shell finite element code, ULSAS, is used for... Read More
Thermal-Mechanical Buckling Analysis of Laminated Composite Shells by Finite ElementMethod
Viewed 208 times since Mon, Jan 21, 2013
This paper presents a finite element scheme to analyze the buckling behavior of composite shells subjected to thermal and mechanical loads. Firstly, a kind of multi-layered composite shell element with relative degrees-of-freedom is adopted to model... Read More
THE S-VERSION OF THE FINITE ELEMENT METHOD FOR MULTILAYER LAMINATES
Viewed 250 times since Sun, Oct 28, 2012
A methodology has been developed to accurately resolve the stress field in the vicinity of free edges as well as the overall response of laminated plates without significantly affecting the computational cost. This is accomplished by enriching a set... Read More
The s-version of Finite Element Method for Laminated Composites
Viewed 219 times since Sun, Oct 28, 2012
The s-version of finite element method is developed for laminated plates and shells. By this technique the global domain is idealized using 2D Equivalent Single Layer model. The regions where ESL model errs badly in capturing localized phenomena are... Read More
The finite element analysis of buckling of laminated rectangular reinforced concrete plates with circular hole
Viewed 553 times since Tue, Aug 21, 2012
In this investigation an approach buclcling analysis for simply supported rectangular reinforced concrete plates under uniaxial compression are developed.The objective of this investigation is to compare buclcling load of the reinforced plate with... Read More
Tetrahedral composite -nite elements
Viewed 286 times since Wed, May 16, 2012
We develop and analyse a composite ‘CT3D’ tetrahedral element consisting of an ensemble of 12 four-node linear tetrahedral elements, coupled to a linear assumed deformation defined over the entire domain of the composite element. The... Read More
Survey of the mathematical modeling of intelligent structures
Viewed 226 times since Thu, Jun 7, 2012
The chapter presents an overview of the modeling that has been proposed by various workers in the field of smart or intelligent structures. Before the main discussion on the various models, some background information will be presented in relation to... Read More
Structural Analysis of the Right Rear Lug of American Airlines Flight 587
Viewed 195 times since Sun, Nov 16, 2014
A detailed finite element analysis of the right rear lug of the American Airlines Flight 587 - Airbus A300-600R was performed as part of the National Transportation Safety Board’s failure investigation of the accident that occurred on November... Read More
STRESS ANALYSIS OF FRP COMPRESSION TEST BY FE-MODELING
Viewed 284 times since Sun, Jun 16, 2013
It is difficult to obtain reliable experimental results for the compressive strength of unidirectional (UD) carbon fibre reinforced composites (CFRP) in the fibre direction, especially in high-cycle fatigue. The Risø Mechanical Combined Loading (MCL... Read More
STOCHASTIC FINITE ELEMENT MODELLING OF FIBRE-METAL LAMINATES
Viewed 198 times since Fri, Apr 26, 2013
Fibre-metal laminates are expected to have larger variations in material properties compared to traditional aerospace materials such as aluminium. E ects of such variations are not taken into account in current numerical models. This paper discusses... Read More
STABILITY OF LAMINATED COMPOSITE CURVED PANELS WITH CUTOUT USING FINITE ELEMENT METHOD
Viewed 284 times since Mon, Sep 17, 2012
Cutouts are inevitable in structures due to practical consideration. The present study involves vibration and stability of laminated composite curved panels with cutouts using finite element method. The first order shear deformation (FSDT) is used to... Read More
SKIN-STRINGER DEBONDING AND DELAMINATION ANALYSIS IN COMPOSITE STIFFENED SHELLS
Viewed 290 times since Thu, Jun 7, 2012
In the present paper the skin-stringer delamination problem for composite stiffened shells is solved. The skin-stringer delamination is analyzed employing linear fracture mechanics approach. Energy release rates (ERR) are calculated by Modified... Read More
Simplified 3-D Fem for the Prediction of Stiffness Elements of Unidirectional Specially and Generally Orthotropic T300-Epoxy Lamina
Viewed 326 times since Thu, Jun 7, 2012
In the present paper simplified 3-D Finite Element models are developed with governing boundary conditions and solved using the FEA software ANSYS version 11 for the prediction of stiffness elements of unidirectional continuous fiber reinforced... Read More
SIMPLE ELASTICITY MODELING AND FAILURE PREDICTION FOR COMPOSITE FLEXBEAMS
Viewed 231 times since Thu, Jun 7, 2012
The main purpose of this work is to develop a simple methodology for applying boundary element modeling to rotorcraft composite structures. A 2D boundary integral formulation for anisotropic elasticity problems is provided. The constant stress and... Read More
Shielding Effectiveness Analysis of Multilayer Carbon-Fiber Composite Materials
Viewed 266 times since Thu, Jun 7, 2012
In this paper, the plane-wave shielding effectiveness (SE) of multilayer composite materials is investigated. The SE of multilayer composite laminates is obtained analytically by using the equivalent anisotropic model of each layer along with the... Read More
Shell Elements and Their Applications in Composite Structure Analysis
Viewed 454 times since Thu, Jun 7, 2012
The following explores the use of shell element types, in ANSYS particularly, for use in the analysis of thin walled composite laminate structures. Here the focus is on a few of the most commonly used structural shell elements in ANSYS and the... Read More
Sandwich buckling formulas and applicability of standard computational algorithm for finite strain
Viewed 511 times since Sun, Aug 21, 2011
Although, for homogeneous columns, the differences between Engesser’s and Haringx’s formulas for shear buckling have been explained in 1971 by the dependence of shear modulus on the axial stress, for soft-core sandwich columns the... Read More
Parametric Investigation of Gas Permeability in Cross-Ply Laminates Using Finite Elements
Viewed 311 times since Wed, Aug 8, 2012
Three-dimensional finite element models are used to study the influence of various parameters on the gas permeability of cross-ply composite laminate. It is shown that the intersection area, which is formed between two adjacent plies due to crack... Read More
Object Oriented Finite Element Analysis for materials science-A tool for viscoelastic polymer composite deformation analysis
Viewed 281 times since Wed, Aug 24, 2011
Object Oriented Finite Element Analysis for material science.  Read More
Numerically Efficient Finite Element Formulation for Modeling Active Composite Laminates
Viewed 196 times since Sat, Apr 6, 2013
Active systems have attracted a great deal of attention in the last few decades due to the potential benefits they offer over the conventional passive systems in various applications. Dealing with active systems requires the possibility of modeling... Read More
Multi-Scale Analyses of Perforated Laminates
Viewed 293 times since Sat, Aug 20, 2011
The effective, i.e. overall mechanical response of multi-phase or other microstructured materials is influenced by the topology and the geometry of the individual phases as well as by the mechanical behavior of the material and interface at... Read More
Modelling of Spread Tow Carbon Fabric Composites for Advanced Lightweight Products
Viewed 147 times since Mon, Feb 16, 2015
The usage of composite materials is growing fast in areas such as aerospace, racing, sports, automotive and industrial products { all having extreme demands on material performance. In applications where stiff ness, strength, low weight, and... Read More
Linear and Nonlinear Finite Element Analysis of Active Composite Laminates
Viewed 222 times since Sat, Apr 13, 2013
The paper presents a finite element concept for analysis of thin-walled active structures featuring fiber reinforced composite laminate as a passive structural material. The structure is rendered active by embedding piezoelectric material as a... Read More
Influence of compression and shear on the strength of Composite Laminates with Z-pinned Reinforcement
Viewed 266 times since Thu, Nov 15, 2012
The influence of compression and shear loads on the strength of composite laminates with z-pins is evaluated parametrically using a 2D Finite Element Code (FLASH) based on Cosserat couple stress theory. Meshes were generated for three unique... Read More
IMPLEMENTATION OF HIGHER ORDER SHEAR THEORY ON ISOTROPIC MATERIAL AND LIUS BENDING PART ON LAMINATED COMPOSITE FLAT SHELL ELEMENTS
Viewed 194 times since Mon, Feb 16, 2015
Plate and shell analysis using classical plate theory (CPT) has a lack of accuracy in predicting the influence of transverse deformation, because of its assumption that the line normal to the surface remains straight and normal to the midplane before... Read More
First-Order Shear Deformation, p-Version, Finite Element for Laminated Plate Nonlinear Vibrations
Viewed 251 times since Tue, Sep 17, 2013
A p-version, hierarchical finite element for moderately thick composite laminated plates is presented, where the effects of the rotary inertia, transverse shear, and geometrical nonlinearity are taken into account. The timedomain free-vibration... Read More
Finite Element Modelling of Damage at the Meso-Scale in Fibrous Composites
Viewed 199 times since Sat, May 14, 2016
The complex failure path of modern composite materials has created a need forefficient models capable of predicting the onset, evolution, and mechanical effect ofdamage. In this research, the damage model at the meso-scale proposed and developedby... Read More
Fastener Modeling for Joining Composite Parts
Viewed 270 times since Sat, Apr 13, 2013
The work presented in this paper extends the fastener FEM formulation previously developed for metallic parts to enable its use with composite parts. The main difference between modeling of fasteners in metallic and composite parts is in the... Read More
Estimation of transverse/interlaminar stresses in laminated composites ± a selective review and survey of current developments
Viewed 349 times since Sun, Jun 17, 2012
A review is made on the diff€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... Read More
Estimation of Interlaminar Stresses in Laminated Plates Subjected to Transverse Loading using Three-dimensional Mixed Finite Element Formulation
Viewed 308 times since Sun, Mar 18, 2012
Interlaminar shear stress distribution in laminated plates is investigated using mixed finite element formulation with 20-noded layered hexahedron element. The element developed contains three transverse displacements (u, v, w) and three interlaminar... Read More
Distributed Finite Element Analysis of Laminated Composites
Viewed 270 times since Sat, Jan 7, 2012
In recent years, fibre reinforced laminated composite plates have been increasingly used as structural elements in civil, military and aerospace fields because of their desirable properties such as high strength-to-weight ratio and high stiffness-to... Read More
DEVELOPMENT OF A FINITE ELEMENT BASED DELAMINATION ANALYSIS FOR LAMINATES SUBJECT TO EXTENSION, BENDING, AND TORSION
Viewed 269 times since Wed, Jan 4, 2012
Delamination is a common failure mode of laminated composite materials. This type of failure frequently occurs at the free edges of laminates where singular interlaminar stresses are developed due to the difference in Poisson's ratios between... Read More
Critical Time Step for a Bilinear Laminated Composite Mindlin Shell Element
Viewed 253 times since Sat, Nov 26, 2011
The critical time step needed for explicit time integration of laminated shell finite element models is presented. Each layer is restricted to be orthotropic when viewed from a properly oriented material coordinate system. Mindlin shell... Read More
ANS Shell Elements with Improved Transverse Shear Accuracy
Viewed 305 times since Thu, Jun 7, 2012
Hierarchical degrees of freedom (dof) augment the standard dof in these new Assumed Natural Coordinate Strain (ANS) plate and shell elements. These hierarchical dof are then eliminated using "kinematic" and "strong form equilibriumn constraints. The... Read More
Analytical response sensitivity of laminated composite plate using trigonometric type element
Viewed 303 times since Sat, Oct 8, 2011
Fibre reinforced polymeric composite have been used for variety of structural applications, taking advantages of their high specific strength and modulus compared with metals. Initially developed for aerospace industry, high-performance... Read More
Analytical models for bistable cylindrical shells
Viewed 345 times since Sat, Oct 8, 2011
Thin cylindrical shell structures can show interesting bistable behaviour. If made unstressed from isotropic materials they are only stable in the initial configuration, but if made from fibre-reinforced composites they may also have a... Read More
ANALYTICAL MODELLING OF LAMINATED COMPOSITE
Viewed 225 times since Fri, Aug 2, 2013
A  significant  number  of  research  papers  has  been published on the analytical modelling of composite laminates over  the past 20 years. The drive for more accurate analysis has led us to techniques which... Read More
Analysis of laminated composite plate/shell structures using a stabilized nodal- integrated quadrilateral element
Viewed 276 times since Thu, Oct 6, 2011
A new simple and accurate four-node quadrilateral element is developed for linear static and dynamic analysis of thin to moderately thick laminated, anisotropic plate/shell structures within the first-order shear deformation theory (FSDT).... Read More
Analysis of adaptive shell structures using a refined laminated model
Viewed 336 times since Mon, Oct 3, 2011
This work presents the development of a shell conical panel finite element model, which has the possibility of having embedded piezoelectric actuators and/or sensors patches. A mixed laminated theory is used, which combines an equivalent ... Read More
An Improved Shear Lag Model for Broken Fibers in Composite Materials
Viewed 327 times since Sun, Oct 2, 2011
A shear lag model is formulated to predict the stresses in a unidirectional fiber reinforced composite. Read More
Accurate Interlaminar Stress Recovery From Finite Element Analysis
Viewed 323 times since Tue, Sep 13, 2011
The successful design of advanced composite aerospace structures requires a detail knowledge of strains and stresses that are induced by the applied loads. The inherent strength weakness between adjacent plies constitutes a... Read More
A TWO-DIMENSIONAL FLOW MODEL FOR THE PROCESS SIMULATION OF COMPLEX SHAPE COMPOSITE LAMINATES
Viewed 163 times since Sat, Jul 2, 2016
A numerical flow-compaction model is developed and implemented in a finite element code to simulate the multiple physical phenomena involved during the autoclave processing of fibre-reinforced composite laminates. The model is based on the... Read More
A three node C element for analysis of laminated composite sandwich shells
Viewed 594 times since Tue, Sep 13, 2011
A three node flat shell element with C rotation fields has been developed for analysis of arbitrary composite shells.  Read More
A SHELL/3D MODELING TECHNIQUE FOR THE ANALYSIS OF DELAMINATED COMPOSITE LAMINATES
Viewed 314 times since Thu, Jun 7, 2012
A shell/3D modeling technique was developed for which a local three-dimensional solid finite element model is used only in the immediate vicinity of the delamination front. The goal was to combine the accuracy of the full three-dimensional solution... Read More
A Plane Strain Model for Process-Induced Deformation of Laminated Composite Structures
Viewed 529 times since Wed, Sep 7, 2011
We present a plane strain finite element model for simulation of the development of process-induced deformation during autoclave processing of complex-shaped composite structures. A "cure-hardening, instantaneously linear elastic”... Read More
A Layerwise Shell Stiffener and Stand-Alone Curved Beam Element
Viewed 338 times since Wed, Aug 31, 2011
A two-dimensional stiffener element for laminated composite shells and plates is developed based on the Layerwise Theory of Reddy for composite laminates. The element has a displacement field compatible with that of a layerwise plate or... Read More
A HIGHER ORDER FINITE ELEMENT FOR SANDWICH PLATE ANALYSIS
Viewed 302 times since Wed, Aug 31, 2011
A finite element model for the analysis of sandwich plates with laminated composites facesheets is developed. In the model, the face-sheets are represented as Reissner-Mindlin plates and therefore inciude shear deformation efTects. The core... Read More
A HIGH PRECISION TRIANGULAR LAMINATED ANISOTROPIC CYLINDRICAL SHELL FINITE ELEMENT
Viewed 395 times since Wed, Aug 31, 2011
Abstract—The stiffness matrix for a high precision triangular laminated anisotropic cylindrical shell finite element has been formulated and coded into a composite structural analysis program. The versatility of the element's ... Read More
A four-node hybrid assumed-strain finite element for laminated composite plates
Viewed 1512 times since Wed, Aug 31, 2011
In this paper a new laminate hybrid assumed-strain plate element is derived within the framework of the First order Shear Deformation Theory (i.e. assuming that particles of the plate originally lying along a straight line which... Read More
A Finite Element Solver for 3-D Compressible Viscous Flows
Viewed 364 times since Wed, Aug 31, 2011
Computation of the flow field inside a space shuttle main engine (SSME) requires the application of the state-of-the-art CFD technology. Several computer codes are under development to solve three dimensional Navier-Stokes equations for... Read More
A finite element model for the orthogonal cutting of fiber-reinforced composite materials
Viewed 306 times since Wed, Aug 31, 2011
The tendency towards increased automation of composite cutting operations stimulates the investigation of cutting force evaluation. Read More
A Finite Element Formulation for the Simulation of Propagating Delaminations in Layered Composite Structures
Viewed 311 times since Wed, Aug 31, 2011
This paper presents a finite element method to simulate growing delaminations in composite structures. The delamination process, using an inelastic material law with softening, takes place within an interface layer having a small, but... Read More
A Finite Element for Modeling Delaminations in Composite Beams
Viewed 305 times since Wed, Aug 31, 2011
A shear deformable beam finite element with nodes offset to either the top or bottom side has been developed. Read More
A Finite Element Analysis for Predicting the Residual Compression Strength of Impact-Damaged Sandwich Panels
Viewed 330 times since Fri, Aug 26, 2011
A simple analysis method has been developed for predicting the residual compression strength of impact-damaged sandwich panels. The method is tailored for honeycomb core-based sandwich specimens that exhibit an indentation growth failure... Read More
A DOUBLY CURVED ELEMENT FOR LAMINATED COMPOSITE SHELLS UNDERGOING FINITE ROTATION
Viewed 368 times since Sat, Aug 20, 2011
A finite element formulation via tensor notation for geometrically exact nonlinear laminated composite shells is presented. The present 5/6-DOF shell theory is based on total Lagrangian concept. The two parametric incremental material... Read More