ABD Matrix Composite Categories and Articles

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Bolted (48)
Bonded (54)
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THERMAL EFFECTS ON THE BEARING BEHAVIOR OF COMPOSITE JOINTS
Viewed 318 times since Wed, Nov 14, 2012
The desire for lighter weight aircraft and spacecraft has led to the utilization of polymer matrix composite materials for many structural components in advanced vehicle designs. Laminated composite panels have the ability to carry high mechanical... Read More
THE EFFECTS OF GEOMETRY AND MATERIAL PROPERTIES ON THE FRACTURE OF SINGLE LAP-SHEAR JOINTS
Viewed 348 times since Tue, Aug 21, 2012
A review of the mechanics of lap-shear joints is followed by a detailed analysis of the problem using a cohesive-zone approach. The cohesive-zone model allows not only the influence of geometry to be considered, but also allows the cohesive... Read More
The Effect of Peel-Ply Surface Preparation Variables on Bond Quality
Viewed 414 times since Thu, Jul 26, 2012
To further understand the effect of the variables present in surface preparation on the durability of cobonded and secondary-bonded composite joints, surface analysis coupled with mechanical testing and fractography were used to analyze samples... Read More
STRUCTURAL JOINTS IN POLYMERIC COMPOSITE MATERIALS
Viewed 228 times since Sat, Apr 19, 2014
The permanent assembly of individual manufactured components is an important aspect of fabrication and construction. There are many ways for accomplishing this including the use of fastenings suchas bolts and rivets, the use of adhesives, and by... Read More
STRESS AND FAILURE ANALYSIS OF LAMINATED COMPOSITE PINNED JOINTS
Viewed 254 times since Sun, Nov 16, 2014
In this study, behavior of pin-loaded laminated composites with different stacking sequence and different dimensions has been observed numerically and experimentally. The aim is to investigate stresses, failure strength and failure mode of composite... Read More
Stress analysis of lap joints involving natural fibre reinforced interface layers
Viewed 316 times since Mon, Jun 17, 2013
This paper is concerned with a fatigue study of composite adhesive lap joints. The tests were carried out on specimen joints manufactured using different stacking sequences: solely bi-directional woven E-glass fibres and polypropylene composites; and... Read More
Static and Fatigue Testing of Thick Adhesive Joints for Wind Turbine Blades
Viewed 308 times since Thu, Mar 14, 2013
Experimental results are presented for the static and fatigue strengths of thick adhesive joint specimens which are representative of blade joints. Four closely related geometries are explored, with over 250 individual tests; fatigue loading... Read More
Static and Dynamic Strength of Scarf-Repaired Thick-Section Composite Plates
Viewed 313 times since Thu, Mar 14, 2013
Composite structural armor is typically a sandwich construction consisting of thick-section composite, rubber, and ceramic layers, which are combined to provide an optimal balance of structural and ballistic performance at minimum weight. Our focus... Read More
STACKING LAMINATE EFFECTS ON ADHESIVE LAP JOINTS STRENGTH
Viewed 365 times since Fri, Sep 6, 2013
This paper is concerned with the influence of the surface treatment, lay-up and stacking sequence on strength of single lap joints. The  tensile  tests  were  carried  out  on  specimen  joints  using ... Read More
Quality evaluation of thermoplastic composite material single-lap joints
Viewed 373 times since Mon, Jul 30, 2012
The joining of glass fibre reinforced polymer (GFRP) matrix composite materials by structural bonding still presents difficulties due to the adopted bonding process, the interface properties and the control of the adhesive thickness. In ... Read More
PINNED CONNECTIONS IN COMPOSITE MATERIALS
Viewed 320 times since Fri, Oct 26, 2012
Stresses have been calculated for a joint in an orthotropic or isotropic plate with a row of pin-loaded holes and for a finite-width joint with one connector. Friction and clearance at the interface between pin and plate material, .as well as pin... Read More
Opto-acoustic detection of thermally induced microcracking in Al/cFRP joints
Viewed 294 times since Thu, Jan 3, 2013
An opto-acoustic technique based on Michelson interferometry provides real-time measurement of moisture, thermal, applied load and/or microcracking induced dimensional changes. Advantages over conventional acoustic emission include elimination of... Read More
JOINT DESIGN
Viewed 437 times since Thu, Oct 18, 2012
One of the primary benefits of adhesive is that it holds something together resisting the stress trying to pull it apart. Tensile stress is exerted equally over the entire joint straight and away from the adhesive bond. Shear stress is across the... Read More
JOINING OF POLYMER COMPOSITE MATERIALS
Viewed 365 times since Tue, Sep 11, 2012
Under ideal conditions load bearing structures would be designed without joints, thus eliminating a source of added weight, complexity and weakness. In reality the need for accessibility, repair, and inspectability, added to the size limitations... Read More
JOINING COMPOSITE MATERIALS — MECHANICAL OR ADHESIVE?
Viewed 335 times since Mon, Sep 10, 2012
The Achilles heels of composite structures are the joints. (Aren’t heels joints?) Manydesigners will tell you that designing the composite laminate is fairly simple, but that far more time is devoted to the designing of the joints. The joints... Read More
Investigations to Model and Analyse the OHC Strength of Hybrid Composites
Viewed 155 times since Sat, May 14, 2016
In recent years, the utilization of hybrid polymer matrix composite materials in many engineering fields has increased tremendously. The present investigation is devoted on fabric-reinforced hybrid composite laminates with different volume ... Read More
Investigation of Adhesive Behavior in Aircraft Applications
Viewed 195 times since Wed, Oct 23, 2013
There are generally three failure modes of adhesive-bonded composite joints: (1) adherend failure, (2) adhesive failure of the adhesive, and (3) cohesive failure of the adhesive. The second part of this report provides (1) an analytical model for... Read More
Influence of the Adhesive, the Adherend and the Overlap on the Single Lap Shear Strength
Viewed 236 times since Sun, Dec 16, 2012
The single lap joint is the most studied joint in the literature in terms of both theory and practice. It is easy to manufacture and the lap shear strength is a useful value for strength assessment and quality control. Simple design rules exist such... Read More
Inflluence of bolt spacing and degree of anisotropy in single-lap joints
Viewed 179 times since Wed, Oct 23, 2013
This study concerns the e€ect of bolt spacing and degree of anisotropy on the bolt load distribution and nature of the failure mechanism. Bolt loads and failure prediction are determined using a solution method that treats the contact stresses and... Read More
Increasing the efficiency of composite single-shear lap joints using bonded inserts
Viewed 262 times since Thu, Nov 15, 2012
A numerical and experimental investigation on the use of bonded metallic inserts to increase the strength and the efficiency of single-shear composite bolted joints is presented. Metallic inserts bonded to a composite laminate are proposed to reduce... Read More
IMPROVING THE FATIGUE RESPONSE OF AEROSPACE STRUCTURAL JOINTS
Viewed 300 times since Mon, Sep 10, 2012
The effect of various surface treatments on the fretting fatigue and joint fatigue performance of a 7xxx series aluminum alloy was investigated with the objective to reduce the nucleation and growth of fretting cracks and enhance the fatigue life of... Read More
FEASIBILITY OF JOINING ADVANCED COMPOSITE FLIGHT VEHICLE STRUCTURES
Viewed 245 times since Wed, Jan 30, 2013
A combined analytical-experimental study was carried out to establish the feasibility of developing rational design techniques for bonded and mechanical joints in advanced composite structures. Available stress analyses were compared for their... Read More
Fastening and Joining of Composite Materials
Viewed 195 times since Wed, Oct 23, 2013
Effect of Bolt Tightening and Joint Material on the Strength and Behavior of Composite Joints. Three Dimensional Formulation of Interfacial Shear  tresses in Bonded Joints under Thermo-mechanical Loading. Read More
EXPERIMENTAL FAILUREMODEDETERMINATION OF GRP/PVC-FOAM SANDWICH T-JOINTS
Viewed 320 times since Tue, Apr 10, 2012
Application of GRP/PVC-Foam sandwich structures on naval ships strongly depends on the mechanical strength and collapse behaviour of the joints of the structure. Quasi-static and dynamic experiments were executed to determine the failure modes and... Read More
EXPERIMENTAL ANALYSIS AND MODELING OF Z-PINNED JOINTS UNDER PULL-OUT LOADING
Viewed 385 times since Tue, Apr 10, 2012
Composite materials are now widely used in aerospace applications such as skin, stiffeners, spars, ribs and other primary structure components. The assembly of these components is made generally by bolting with a high-cost associated, so new low-cost... Read More
Effect of Stitching on Debonding in Composite Structural Elements
Viewed 302 times since Sun, Feb 12, 2012
Stitched multiaxial warp knit materials have been suggested as viable alternatives to laminated prepreg materials for large aircraft structures such as wing skins. Analyses have been developed to quantify the effectiveness of stitching for reducing... Read More
EFFECT OF STACKING SEQUENCE ON NOTCH STRENGTH IN LAMINATES
Viewed 205 times since Thu, Nov 28, 2013
In the present work data is presented for three different stacking sequences of a 10-ply and 16-ply laminates comprised of unidirectional and angled plies: [+θ/0], [0/±θ], and [+θ/0/-θ]. Notch geometry is limited to circular holes of which four... Read More
EFFECT OF STACKING SEQUENCE ON NOTCH STRENGTH IN LAMINATES
Viewed 175 times since Sat, Apr 19, 2014
In the present work data is presented for three different stacking sequences of a 10-ply and 16-ply laminates comprised of unidirectional and angled plies: [+θ/0], [0/±θ], and [+θ/0/-θ]. Notch geometry is limited to circular holes of which four... Read More
Effect of Load-Bypass on Structural Efficiencies of Bonded and Bolted Repairs
Viewed 247 times since Wed, Oct 23, 2013
Low-stiffness scarf inserts within adhesively bonded scarf repairs and bolted doublers within mechanically fastened repairs transfer less load than that originally supported by the damaged area of the structure. In this work we present an improved... Read More
Dimensionless parameters in symmetric double lap joints: an orthotropic solution for thermomechanical loading
Viewed 317 times since Sat, Jan 7, 2012
Two thermomechanical analytical models are proposed for orthotropic double lap joints, and are compared to a finite element model. The solutions, based on the principle of virtual work, differ in the complexity of the assumed stress field. The first... Read More
DEVELOPMENT OF AN UNDERSTANDING OF THE FATIGUE PHENOMENA OF BONDED AND BOLTED JOINTS IN ADVANCED FILAMENTARY COMPOSITE MATERIALS VOLUME I. ANALYSIS METHODS
Viewed 333 times since Thu, Jan 5, 2012
Emphasis was placed on the development of closed form analysis procedures for bonded joints in laminated compasites. A comprehensive linear analysis method and associated computer program (BONJO I) has been developed. Numerical results obtained with... Read More
Design Requirements for Bonded and Bolted Composite Structures
Viewed 426 times since Sun, Dec 25, 2011
This report provides an overview of different approaches and industrial codes of practice used for the design and analysis (including data requirements and methods of data generation) of bolted and bonded composite structures for use under monotonic,... Read More
CYCLIC BEHAVIOR OF STEEL AND COMPOSITE BEAM-TO-COLUMN JOINTS
Viewed 317 times since Sat, Nov 26, 2011
The paper presents the results obtained from experimental research on two types of European joint solutions, namely steel and composite beam-to-column connections. Steel joints were designed in order to investigate the influence of the... Read More
Connections of Fiber Reinforced Polymer (FRP) Structural Members: A Review of the State of the Art
Viewed 304 times since Sat, Nov 26, 2011
Fiber-reinforced polymers (FRP) represent a new class of construction materials. In the past two decades, their use has spread from the aerospace industry to civil infrastructure, which presents a new set of challenges. For seismic... Read More
CFRP/TITANIUM HYBRID MATERIAL IMPROVING COMPOSITE STRUCTURE COUPLING
Viewed 439 times since Sat, Oct 22, 2011
One of the most important challenges during the  development of composite structures is found in the design of structural interconnections. One of the main methods currently used for joining components is still mechanical... Read More
Application of the point stress criterion to the failure of composite pinned joints
Viewed 501 times since Sat, Oct 8, 2011
An analysis was performed to evaluate the bearing strength of pin-loaded composite joints using a two parameter characteristic curve model. This model involves determination of characteristic dimensions in tension and compression and based on... Read More
ANALYSIS OF BOLTED AND BONDED COMPOSITE JOINTS
Viewed 311 times since Thu, Sep 27, 2012
In the analysis and design of bonded and bolted composite joints, certain input data are required that are not readily available. Many engineering hours at the depots are expended in obtaining the required information. Even when the data are obtained... Read More
ADVANCES IN ADHESIVE JOINING OF DISSIMILAR MATERIALS WITH SPECIAL REFERENCE TO STEELS AND FRP COMPOSITES
Viewed 328 times since Sat, Sep 24, 2011
The paper discusses the advantages and limitations of a proposed partially cured carbon fibre composite prepreg and a compatible film adhesive both developed specifically for the construction industry. The system has been developed from one... Read More
Advanced Certification Methodology for Composite Structures
Viewed 335 times since Sat, Sep 24, 2011
An improved certification methodology for composite structures was developed. The methodology permits certification of bonded and cocured composite structures with the same level of confidence as bolted structures. This methodology also ensures that... Read More
ADHESSIVE BONDED DOUBLER FOR H-3 HELICOPTER BLADE SPAR
Viewed 229 times since Wed, Jan 30, 2013
An in-house program has been in.... in order to demonstrate the feasibility of the use of an adhesive bonded, structural doubler to provide a field fix solution to the problem of crack formation in the rivet holes of the tip of the CH/HH-3C main... Read More
ACOUSTIC EMISSION INSPECTION AND ANALYSIS OF CRIMPED METAL-COMPOSITE JOINTS SUBJECTED TO BENDING
Viewed 420 times since Tue, Sep 13, 2011
Experimental and numerical studies are carried out on crimped mixed metal-composite joints integrated in electrical insulators subject to bending. Strain monitoring is performed with strain gauges and a six-channel acoustic emission... Read More
A LAYERED BEAM THEORY FOR SINGLE LAP JOINTS
Viewed 400 times since Sat, Sep 24, 2011
The well known analysis of the single lap joint by Goland and Reissner provided important contributions to the literature on stress analysis of adhesive joints by clarifying not only the importance of adhesive peel stresses in joint failure... Read More