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Variable-stiffness composite panels: Buckling and first-ply failure improvements over straight-fibre laminates
Viewed 405 times since Tue, Sep 6, 2011
One of the primary advantages of using fibre-reinforced laminated composites in structural design is the ability to change the stiffness and strength properties of the laminate by designing the laminate stacking sequence in order to improve its... Read More
THE INFLUENCE OF FIBER WAVINESS ON THE CRITICAL BUCKLING LOAD OF MULTILAYERED COMPOSITES
Viewed 320 times since Wed, Sep 5, 2012
The present research involves the development of theoretical model to investigate the effect of the in-plane fiber waviness on the critical shear buckling load of multilayered composite plates. This paper analyzes the in-plane shear buckling behavior... Read More
THE EFFECT OF INTERFACE DAMAGE ON THE MICROBUCKLING OF UNDIRECTIONAL FIBER-REINFORCED COMPOSITES
Viewed 422 times since Thu, Jul 26, 2012
Fiber microbuckling is the primary failure mechanism in unidirectional fiber-reinforced composites under compression. Due to processing or service conditions, damage (e.g., microcracks) exists at fiber/matrix interfaces. The effect of damage on the... Read More
The Buckling of Laminated Cylindrical Thin Shells under Torsion Varying as a Linear Function of Time
Viewed 508 times since Fri, May 25, 2012
The buckling of laminated orthotropic cylindrical thin shells under torsion, which is a linear function of time, has been investigated. First, fundamental relations and the modi ed Donnell type stability equations of the laminated cylindrical thin... Read More
STATIC AND DYNAMIC INTERACTIVE BUCKLING OF COMPOSITE COLUMNS
Viewed 315 times since Sun, Dec 16, 2012
The static and dynamic problem of interaction of global buckling modes in compressed columns with complex open and closed cross-sections was considered in the paper. The columns made of laminate composites were assumed to be simply supported at both... Read More
STATIC AND DYNAMIC BUCKLING OF LAMINATED COMPOSITE SHELLS
Viewed 269 times since Tue, Nov 13, 2012
This paper presents the results from numerical investigation of the behavior of cylindrical laminated shells subjected to suddenly applied loading. A numerical approach is used combining the finite element method with two different stability criteria... Read More
STABILITY OF COMPOSITE CYLINDERS WITH A FULL ANNULAR DELAMINATION UNDER EXTERNAL PRESSURE
Viewed 325 times since Mon, Sep 17, 2012
The stability of cylindrical shells under external fluid pressure is usually controlled by a combination of global elastic buckling and material damage. Interfacial delaminations may occur in laminated composite materials during the manufacturing... Read More
Simplified Models for the Study of Postbuckled Hat-Stiffened Composite Panels
Viewed 221 times since Fri, Aug 2, 2013
The postbuckling response and failure of multistringer stiffened panels is analyzed  using  models  with  three  levels  of  approximation. The  first model uses a relatively coarse mesh to capture the global... Read More
Lateral torsion-flexure buckling of corrugated web steel girders
Viewed 335 times since Sat, Apr 13, 2013
Resistance to lateral torsion-flexure buckling of steel I-girders with plane webs is a very important design requirement. Codes of practice allow designers to use the critical moment of a simply supported beam subject to a constant moment and relate... Read More
INFLUENCE OF GEOMETRIC IMPERFECTIONS AND LAMINATION DEFECTS ON THE BUCKLING BEHAVIOUR OF COMPOSITE CYLINDERS
Viewed 299 times since Sun, Dec 16, 2012
The buckling behaviour of composite cylinders is highly influenced by the presence of geometric imperfections and other factors that can cause big discrepancies between experimental loads and analytical values. The influence of the geometric... Read More
Improved Design Formulae for Buckling of Orthotropic Plates under Combined Loading
Viewed 220 times since Tue, Aug 20, 2013
Simple, accurate buckling  interaction formulae are presented for long orthotropic plates with  either simply  supported or clamped  longitudinal edges  and  under combined  loading that   are suitable... Read More
FAILURE OF WEB-FLANGE JUNCTION IN POSTBUCKLED PULTRUDED I-BEAMS
Viewed 250 times since Sat, Apr 13, 2013
A numerical procedure for analyzing a common and catastrophic failure mode in pultruded composite material I-beams is presented in this paper. Pultruded wide-flange profiles (often referred to as I-beams) exhibit a number of different failure modes... Read More
Experimental-Numerical Investigation of Delamination Buckling and Growth
Viewed 305 times since Sun, Jun 17, 2012
The growth of delaminations in CFRE (Carbon Fibre Reinforced Epoxy) specimens during R=-1 fatigue loading has been studied. Artificial circular delaminations have been introduced during manufacturing to simulate a pre-damaged structure and to cause... Read More
Dimensioning of Orthotropic Stiffened CFRP Shells of Large Launch Vehicle for Load Introduction and Stability
Viewed 389 times since Sat, Jan 7, 2012
The dimensioning of an ortotropic stiffened cylindrical CFRP shell subjected to load introduction of concentrated axial loads using rapid analytical methods is presented. The dimensioning considers required constrains in the force flux distribution,... Read More
Design of laminated Plates for Maximum Buckling load
Viewed 375 times since Sat, Dec 24, 2011
The buckling load of laminated plates having midplane symmetry is maximized for a given total thickness. The thicknesses of the layers are taken as the design variables. Buckling analysis is carried out using the fInite element method. The optimality... Read More
DESIGN OF COMPOSITE-MATERIAL PLATES FOR MAXIMUM UNIAXIAL COMPRESSIVE BUCKLING LOAD
Viewed 344 times since Fri, Dec 23, 2011
A major potential advantage claimed for fibrous composite materials in structural applications is that the material can be "tailored" by proper orientation of the fibers in the various layers so as to optimize the desired structural behavior. Yet the... Read More
Delamination buckling of FRP layer in laminated wood beams
Viewed 326 times since Wed, Dec 21, 2011
An analytical solution for predicting delamination buckling and growth of a thin fiber reinforced-plastic (FRP) layer in laminated wood beams under bending is presented. Based on a strength-of-materials approach, displacement functions for a... Read More
DELAMINATION BUCKLING OF A SHORT ORTHOTROPIC TUBE UNDER AXIAL COMPRESSION
Viewed 332 times since Wed, Dec 21, 2011
A model is selected for the study of delamination buckling of a short laminated orthotropic tube under axial compression. Delamination is assumed to exist prior to loading and it spans the entire circumference. On the basis of total Lagrangian... Read More
Degradation investigation in a postbuckling composite stiffened fuselage panel
Viewed 375 times since Wed, Dec 21, 2011
The European Commission Project COCOMAT (Improved MATerial Exploitation at Safe Design of COmposite Airframe Structures by Accurate Simulation of COllapse) is a currently running four-year project that aims to exploit the large strength reserves of... Read More
COMPRESSNE BUCKLlNG OF SIMPLY SUPPORTED CURVED PLATES AND CYLJNDERS OF SANDWICH CONSTRUCTION
Viewed 376 times since Sat, Nov 26, 2011
Theoretical solutions are presented for the buckling in uniform axial compression of two types of simply supported curved sandwich plates: the corrugated-core type and the isotropic-core type. The solutions are obtained from a theory... Read More
Compressive kinking of fiber composites: A topical review
Viewed 197 times since Sun, Nov 16, 2014
This is a review of the results of several selected theoretical studies concerned with the localized kinking, or microbuckling, of aligned fiber composite materials subjected to compression in the fiber direction. Compressive kinking is of primary... Read More
Combined-Load Buckling Behavior of Metal-Matrix Composite Sandwich Panels Under Different Thermal Environments
Viewed 480 times since Tue, Nov 8, 2011
Combined compressive and shear buckling analysis was conducted on flat rectangular sandwich panels with the consideration of transverse shear effects of the core. The sandwich panel is fabricated with titanium honeycomb core and laminated... Read More
Buckling-Crippling of Structural Angle Beams Produced using Discontinuous-Fiber Composites
Viewed 100 times since Sat, May 14, 2016
The underlying objective of this four-year study is to determine how well the mechanical behavior of discontinuousfiber composite (DFC) structural components can be predicted using properties inferred from simple coupon level measurements. During... Read More
BUCKLING STRENGTH OF PLATED STRUCTURES
Viewed 505 times since Sat, Oct 22, 2011
This document describes two different, but equally acceptable methods, for buckling and ultimate strength assessment of plated structures. The first method, as given in Part 1, is a conventional buckling code for stiffened and unstiffened... Read More
Buckling Similitude Invariants of Symmetrically Laminated Plates Subjected to Biaxial Loading
Viewed 507 times since Wed, Aug 17, 2011
This research paper is to derive the buckling similitude invariant of symmetrically cross-ply and angle-ply laminated plates by applying the similitude transformation to the governing differential equations directly instead of to the... Read More
Buckling of Transversely Framed Panels
Viewed 310 times since Sat, Oct 22, 2011
FRP laminates generally have ultimate tensile and compressive strengths that are comparable with mild steel but stiffness is usually only 5% to 10%. A dominant design consideration then becomes elastic instability under... Read More
Buckling of Long Sandwich Cylindrical Shells Under External Pressure
Viewed 376 times since Sat, Oct 22, 2011
An elasticity solution to the problem of buckling of sandwich long cylindrical shells subjected to external pressure is presented. In this context, the structure is considered a three-dimensional body. All constituent phases of the sandwich... Read More
Buckling of Long Compression-Loaded Anisotropic Plates Restrained Against Inplane Lateral and Shear Deformations
Viewed 353 times since Wed, Aug 17, 2011
An approach for synthesizing buckling results and behavior for thin balanced and unbalanced symmetric laminates that are subjected to uniform axial compression loads and elastically restrained against inplane expansion, ... Read More
Buckling of Imperfect Sandwich Cones under axial compression - equivalent cylinder approach - part 1
Viewed 580 times since Sat, Oct 22, 2011
In order to simplify the problem, the equivalent cylinder assumption has been adopted. Read More
Buckling of Honeycomb Sandwiches: Periodic Finite Element Considerations
Viewed 456 times since Sat, Oct 22, 2011
Sandwich structures are efficient lightweight materials. Due to there design they exhibit very special failure modes such as global buckling, shear crimping, facesheet wrinkling, facesheet dimpling, and face/core yielding. The core of... Read More
Buckling of FRP Columns
Viewed 381 times since Sat, Oct 22, 2011
The objective of this report is to describe the experimental and analytical work leading to a universal design equation for pultruded columns.  Read More
Buckling induced delamination analysis of composite laminates with soft-inclusion
Viewed 328 times since Fri, Oct 21, 2011
The effect of material impact damage on buckling-driven delamination growth in composite laminates under compression is studied using FEA Read More
Buckling Behaviour of Composite Laminated Corrugated Panel with Sinusoidal Profile Part 1: Equivalent Stiffness Terms
Viewed 1165 times since Tue, Aug 16, 2011
This paper deals with equivalent stiffness techniques, as a corrugated panel is approximated by an anisotropic plate. The extending classical laminate theory is applied to the cross section of a corrugated plate with sinusoidal profile... Read More
BUCKLING AND IMPERFECTION-SENSITIVITY OF AXIALLY COMPRESSED CYLINDRICAL SHELLS WITH COMPLIANT CORES
Viewed 311 times since Fri, Oct 21, 2011
The extent to which the mechanical properties and dimensions of compliant cores influence the load-carrying capacity and imperfection-sensitivity of axially compressed cylindrical shells is analyzed numerically for a wide range of configuration... Read More
Buckling and Failure of Compression-loaded Composite Laminated Shells with Cutouts
Viewed 559 times since Fri, Oct 21, 2011
Results from a numerical and experimental study that illustrate the effects of laminate orthotropy on the buckling and failure response of compression-loaded composite cylindrical shells with a cutout are presented. The effects of... Read More
Buckling Analysis of Symmetric Laminated Composite Plates by using Discrete Singular Convolution
Viewed 389 times since Thu, Aug 18, 2011
A numerical model for the analysis of laminated composite rectangular plates is proposed. Read More
Buckling analysis of symmetric laminated composite plates by using discrete singular convention
Viewed 319 times since Fri, Oct 21, 2011
A numerical model for the analysis of laminated composite rectangular plates is proposed. Read More
Buckling analysis of skew laminate plates subjected to uniaxial inplane loads
Viewed 386 times since Thu, Aug 18, 2011
Elastic stability of skew composite laminate plates subjected to uniaxial inplane compressive forces has been studied. The critical buckling loads of the skew laminate plates are carried out by the bifurication buckling analysis implemented... Read More
Buckling analysis of quasi-isotropic symmetrically laminated rectangular composite plates with an elliptical/circular cutout subjected to linearly varying in-plane loading using fem
Viewed 265 times since Sun, Aug 16, 2015
In this paper the effects of circular and elliptical cutout on the buckling behavior of a sixteen ply quasi-isotropic graphite/epoxy symmetrically laminated rectangular composite plate [0°/+45°/- 45°/90°]2s, subjected to various linearly varying... Read More
Buckling Analysis of non-orthotropic laminates by means of b-spline functions
Viewed 699 times since Thu, Aug 18, 2011
Whereas the buckling of rectangular plates with symmetrical layup and an effectively orthotropic behaviour is well understood, the situation gets more complicated when an arbitrary symmetrical layup is admitted.  Read More
BUCKLING ANALYSIS OF GRID STIFFENED COMPOSITE CYLINDERS
Viewed 447 times since Fri, Oct 21, 2011
In this paper buckling investigation of a grid stiffened composite cylinder is presented using analytical model, Finite elements model and  experimentation. The cylinder under discussion has orthotropic stiffeners integrally made... Read More
Buckling Analysis of Fiber-Composite Laminate Shells with Material Nonlinearity
Viewed 368 times since Wed, Aug 17, 2011
A nonlinear material constitutive model, including a nonlinear in-plane shear formulation and a failure criterion, for fiber-composite laminate materials is employed to carry out finite element buckling analysis for composite shells under hydrostatic... Read More
Buckling Analysis of Corrucomb–Steel Skin Sandwich Panel
Viewed 396 times since Thu, Aug 18, 2011
Three buckling scenarios were considered for the design and application of Corrucomb – steel skin sandwich panels: skin dimpling (localized buckling), vertical buckling, and shear buckling. Critical buckling loads for each scenario were calculated... Read More
Buckling Analysis of Composite Laminated Plate with Cutouts
Viewed 458 times since Thu, Aug 18, 2011
The determination of critical buckling load of composite plate is an important factor in determining the structural stability, which was done by ANSYS program and experimental investigation was carried out on many specimens of composite... Read More
Buckling Analysis of composite laminate skew plates with various edge support conditions
Viewed 409 times since Thu, Aug 18, 2011
This research paper studies the buckling behavior of rectangular and skew thin composite plates with various boundary conditions using the Ritz method along with the proposed out-of-plane displacement functions. The boundary... Read More
Buckling analysis of composite laminate rectangular and skew plates with various edge support conditions
Viewed 417 times since Wed, Aug 17, 2011
This research paper studies the buckling behavior of rectangular and skew thin composite plates with various boundary conditions using the Ritz method along with the proposed out-of-plane displacement functions. The boundary conditions considered in... Read More
Buckling analyses of fiber-composite laminate shells with material nonlinearity
Viewed 374 times since Fri, Oct 21, 2011
A nonlinear material constitutive model including a nonlinear in-plane shear formulation and aa failure criterion, for fiber-composite laminate materials is employed to carry out fea buckling analysis.  Read More
Buckling analyses of composite laminate skew plates with material nonlinearity
Viewed 349 times since Wed, Aug 17, 2011
A nonlinear material constitutive model, including a nonlinear in-plane shear formulation and the Tsai–Wu failure criterion, for fiber composite laminate materials is employed to carry out finite element buckling analyses for composite... Read More
Bifurcation, Limit-Point Buckling, and Dynamic Collapse of Transversely Loaded Composite Shells
Viewed 466 times since Wed, Sep 21, 2011
The transverse-loading response of laminated composite shell structures is studied experimentally and numerically. Monolithic graphite/epoxy shell structures having layups of [§ 45n/0n]s (n = 1; 2; and 3) closely represent commercial... Read More
ADHESIVE IN THE BUCKLING FAILURE OF CORRUGATED FIBERBOARD: A FINITE ELEMENT INVESTIGATION
Viewed 622 times since Tue, Sep 13, 2011
This research study proposed to include the glue material in a finite element model that represents the actual geometry and material properties of a corrugated fiberboard. The model is a detailed representation of the different... Read More
A STUDY ON BUCKLING BEHAVIOR OF COMPOSITE SHEETS REINFORCED BY HYBRID WOVEN FABRICS
Viewed 502 times since Tue, Sep 13, 2011
To achieve a particular property, it is possible to mix two or more materials to form composites. In this study, to obtain superior characteristics, new composites are made with multi-components reinforcement. In order to improve the... Read More
A simulation study on the thermal buckling behavior of laminated composite shells with embedded shape memory alloy (SMA) wires
Viewed 496 times since Mon, Sep 12, 2011
In this paper, numerical simulation analyses of the thermal buckling behavior of laminated composite shells with embedded shape memory alloy (SMA) wires were performed to investigate the e€ect of embedded SMA wires on the characteristics of... Read More
A New Approach for Establishing Structural Similitude for Buckling of Symmetric Cross-Ply Laminated Plates Subjected to Combined Loading
Viewed 315 times since Mon, Sep 5, 2011
Similitude theory is a powerful tool to establish the sufficient and necessary conditions of similarity between the model and prototype. Read More
A Continuum Solution to the Problems of Composite Laminate Analysis
Viewed 314 times since Thu, Aug 18, 2011
In this paper, a method of solution and some numerical resuse of free vibration and buckling of composite laminates are presented. All the edges of the laminates are assumed as simply supported. Ritz's method of solution is used... Read More