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Water Absorption
Viewed 353 times since Wed, Aug 24, 2011
When an organic matrix composite is exposed to a humid environment or liquid, both the moisture content and material temperature may change with time. These changes usually degrade the mechanical properties of the laminate. Read More
ULTRA-THICK CROSS SECTION FIBER REINFORCED COMPOSITES
Viewed 257 times since Thu, Apr 26, 2012
We developed a thermo-chemical computer model that is capable of approximating the heat transfer that occurs within a composite as it cures. The model is easily adjustable to different fiber/resin systems. An intensive study using a pre-catalyzed... Read More
Thermal Fatigue in Carbon Fibre Polymer-Matrix Composites, Monitored in Real TIme by Electrical Resistance Measurements
Viewed 275 times since Mon, Jan 21, 2013
Thermal fatigue and temperature of a continuous carbon fiber epoxy-matrix composite were simultaneously monitored by measurement of the contact electrical resistivity of the interlaminar interface. A temperature increase caused the resistivity to... Read More
THERMAL EXPANSION OF ASYMMETRICAL LAMINATES
Viewed 319 times since Wed, Nov 14, 2012
Asymmetry in composite laminates originates from materials variability and fabrication errors. This typically enhances bending-extensional coupling. With hygrothermal loading various forms of warping occur. These cause errors in the desired in-plane... Read More
THERMAL ELASTIC-PLASTIC STRESS ANALYSIS OF STEEL FIBER REINFORCED ALUMINUM METAL-MATRIX COMPOSITE ARCHES
Viewed 241 times since Wed, Nov 14, 2012
A thermal elastic-plastic stress analysis is carried out on steel fiber reinforced aluminum metal-matrix composite arch under uniform temperature distribution. The arch is fixed at both ends. The composite material is assumed to be strain hardening... Read More
THERMAL DEFLECTIONS OF THICK ELASTIC TRIANGULAR PLATE RESTING ON ELASTIC FOUNDATION
Viewed 196 times since Wed, Nov 14, 2012
The present investigation is aimed to determine the deflections of a thick right angled isosceles triangular plate placed on elastic foundation including the effect of a steady temperature distribution which is obtained as the solution of the three... Read More
Thermal conductivity enhancement of carbon fiber composites
Viewed 214 times since Wed, Nov 14, 2012
The effective thermal conductivity enhancement of carbon fiber composites is investigated in this contribution using a three-dimensional numerical method. First a more realistic three-dimensional distribution of fibers dispersed in a matrix phase is... Read More
Thermal buckling analysis of rectangular composite plates with temperature-dependent properties based on a layerwise theory
Viewed 306 times since Sun, Oct 28, 2012
Thermal buckling analysis of rectangular composite multilayered plates under uniform temperature rise is investigated using a layerwise plate theory. von Karman strain–displacement equations are employed to account for large deflections occurrence.... Read More
The Thermal and Thermo-Mechanical Properties of Carbon Composite Laminate
Viewed 298 times since Sun, Oct 28, 2012
As the roadmap for silicon die mounted directly onto a printed circuit board advances, many technologies such as Die Attach Film, ACF/NCF, ACP/NCP, underfill and adhesion materials have moved quickly into mainstream use, gaining acceptance in... Read More
The E®ect of Hygrothermal Aging on the Microcracking Properties of of Some Carbon Fiber-Polyimide Laminates
Viewed 337 times since Thu, Jul 26, 2012
Hygrothermal aging in the absence of external loads can lead to spontaneous formation of matrix microcracks in carbon ¯ber laminates made with Avimid R° K polymer. The microcracks are caused by a water-induced decrease in the laminate microcracking... Read More
The application of thermally induced multistable composites to morphing aircraft structures
Viewed 315 times since Fri, May 25, 2012
One approach to morphing aircraft is to use bistable or multistable structures that have two or more stable equilibrium configurations to define a discrete set of shapes for the morphing structure. Moving between these stable states may be achieved... Read More
Temperature effect during humid ageing on interfaces of glass and carbon fibers reinforced epoxy composites
Viewed 394 times since Sat, Aug 20, 2011
Weight change behavior of fiber-reinforced polymer composites in humid and thermal environments appears to be a complex phenomena. The state of fiber/matrix interface is believed to influence the nature of diffusion modes. A significant weakening... Read More
R&D on Technology for Fabrication of Carbon Fiber of High Thermal Conductivity
Viewed 371 times since Thu, Sep 27, 2012
The purpose of our research was to develop a process for producing from petroleum fraction a raw material pitch (catalytically synthesized pitch) for carbon fiber (hereinafter abbreviated CF) of outstanding spinning and orientation properties, using... Read More
NUMERICAL SIMULATION OF BOND DETERIORATION BETWEEN CFRP PLATE AND CONCRETE IN MOISTURE ENVIRONMENT
Viewed 205 times since Sat, Apr 6, 2013
This research investigated the effect of interface region relative humidity (IRRH) on the bond between CFRP and concrete using computer simulation technique. After FRP is peeled off concrete substrate, there is a layer of residue concrete on the... Read More
Introduction to Composite Materials and Structures-Hygrothermal Effects
Viewed 113 times since Sat, May 14, 2016
Most composites materials are cured by application of heat. In other cases, when external heat is not applied, the curing process itself produces significant heat due to onset of exothermic reactions. Read More
Hygrothermal Effects on the Tensile Strength of Carbon/Epoxy Laminates with Molded Edges
Viewed 221 times since Thu, Nov 28, 2013
The interlaminar stresses are confined to a region near the free edge. Therefore, the laminate stacking sequence and the free edge finishing are some of the factors that affect the strength of the laminate and limit its life. The use of molded edges... Read More
Hygrothermal Effects on the Tensile Strength of Carbon-Epoxy Laminates with Molded Edges
Viewed 175 times since Sun, Jan 19, 2014
This work presents the results of a comparative study of the resistance to delamination of laminates with machined edges and molded edges. Additionally, two environmental conditions were considered: dry laminates and laminates saturated with moisture... Read More
HYGROTHERMAL DEFORMATION OF COMPOSITE SANDWICH PANELS
Viewed 215 times since Sat, Apr 6, 2013
Coefficients ofthennal and moisture expansion (CTE and CME) can be predicted for many composite laminates and sandwich panels. Core and adhesive properties, such as geometry and stiffuess are important variables. Laminate theory is augmented with a... Read More
HYGROTHERMAL AGING OF POLYIMIDE MATRIX COMPOSITE LAMINATES
Viewed 245 times since Sat, Apr 6, 2013
Two polyimide-matrix systems were subjected to a series of hygrothermal aging experiments at various temperatures and relative humidities. For each aging condition, we measured the microcracking fracture toughness as a function of aging time. The... Read More
Gradient-dependent Model for Moisture Diffusion in a Polymer Matrix Composite Laminate
Viewed 228 times since Wed, Jan 30, 2013
This study presents a new diffusion model named the gradient dependent model. It is based on the strain-dependent model, a modification of Fick’s diffusion model, and is employed to solve penetrant diffusion in a 2D-infinite plate with finite... Read More
Experimental and Numerical Evaluation of Thermal Performance of Steered Fibre Composite Laminates
Viewed 192 times since Wed, Oct 8, 2014
For Variable Stiffness (VS) composites with steered curvilinear tow paths, the fiber orientation angle varies continuously throughout the laminate, and is not required to be straight, parallel and uniform within each ply as in conventional composite... Read More
ENVIRONMENTAL EXPOSURE EFFECTS ON COMPOSITE MATERIALS FOR COMMERCIAL AIRCRAFT
Viewed 312 times since Sun, Mar 18, 2012
The expanded use of composite materials in primary aircraft structures requires an improved understanding of their durability. An experimental program was conducted from November 1977 to December 1990 to evaluate the influence of aircraft-associated... Read More
ELASTO-PLASTIC THERMAL STRESS ANALYSIS IN A THERMOPLASTIC COMPOSITE DISC UNDER UNIFORM TEMPERATURE USING FEM
Viewed 353 times since Sun, Mar 4, 2012
The aim of this study was to investigate elasto-plastic thermal stresses in a thermoplastic composite disc that is reinforced by steel fibers, curvilinearly. Finite element method (FEM) was used to calculate the thermal stress distribution in the... Read More
Effects of crosshead velocity and sub-zero temperature on mechanical behaviour of hygrothermally conditioned glass fibre reinforced epoxy composites
Viewed 303 times since Sun, Feb 12, 2012
Experimental studies have been carried out to study the effects of thermal and moist environments (hygrothermal) on mechanical behaviour of glass fibre/epoxy composites. The hygrothermal conditioning impairs the fibre/matrix interfacial and/or... Read More
Effects of Changing Environment and Loading Speed on Mechanical Behavior of FRP Composites
Viewed 310 times since Sun, Feb 12, 2012
Durability of fiber reinforced polymer composites (FRP) are controlled by the durability of their constituents: reinforcement fibers, resin matrices, and the status of interfaces. A great deal of research has been focused on attempting to assess the... Read More
Effective Thermal Conductivity of a Thin Composite Material
Viewed 307 times since Sun, Feb 12, 2012
The thermal conductivity of a randomly oriented composite material is modeled using,  a probabilistic approach in order to determine if a size effect exists for the thermal conductivity small composite thicknesses. The numerical scheme employs a... Read More
Effect of Thermal Stresses on the Failure Criteria of Fiber Composites
Viewed 314 times since Sun, Feb 12, 2012
When composite laminates are operated at cryogenic temperatures, thermal stresses arise. This is due to the difference in coefficients of thermal expansion of different plies and also between the fiber and matrix. While the former is taken into... Read More
Effect of Saltwater on Multiaxial Cyclic Fatigue of Carbon Fiber/Epoxy Composite Material
Viewed 612 times since Sun, Feb 12, 2012
Carbon/epoxy composites have been used for a variety of high-performance engineering structures. In general, all engineering composite structures are subject to a multiaxial stress state. Also, carbon/epoxy composites are susceptible to environmental... Read More
Effect of moisture on the interlaminar interface of a carbon fiber polymer-matrix composite, studied by contact electrical resistivity measurement
Viewed 286 times since Wed, Jan 25, 2012
Abstract-Moisture was found to have a reversible effect on the interlaminar interface of a continuous carbon fiber epoxy-matrix composite. An increase in humidity increased the resistivity. The reversibility was essentially complete after the first... Read More
Effect of hygrothermal shock cycles on interlaminar shear strength of hybrid composites
Viewed 278 times since Wed, Jan 25, 2012
The present work aims to assess the interlaminar shear strength (ILSS) of interply woven fabric glass/carbon hybrid composites under the influence of a fluctuating humid environment. The ILSS values have been used for quantification of mechanical... Read More
EFFECT OF FIBER ORIENTATION AND CYCLIC ENVIRONMENTAL CONDITIONS ON THE NON-MECHANICAL RESIDUAL STRESSES IN RESIN MATRIX COMPOSITE PANELS
Viewed 298 times since Sat, Jan 7, 2012
The main objective of this work is to study the effect of the fiber orientation on the nonmechanical residual stresses in resin matrix composite panel exposed to cyclic temperature and moisture environmental conditions during long time. The effect of... Read More
EFFECT OF FIBER ORIENTATION AND CYCLIC ENVIRONMENTAL CONDITIONS ON THE NON-MECHANICAL RESIDUAL STRESSES IN RESIN MATRIX COMPOSITE PANELS           
Viewed 105 times since Sat, Apr 6, 2013
The main objective of this work is to study the effect of the fiber orientation on the nonmechanical residual stresses in resin matrix composite panel exposed to cyclic temperature and moisture environmental conditions during long time. The effect of... Read More
Dimensional and geometrical stability of CFRP laminates in hostile environment
Viewed 312 times since Sat, Jan 7, 2012
Application field of carbon fiber reinforced polymeric matrix composites (CFRPs) is still limited due to their dimensional instability regardless of the facts that carbon fiber has excellent low coefficient of liner expansion and high mechanical... Read More
Determination of Temperature/ Moisture Sensitive Composite Properties
Viewed 283 times since Wed, Dec 28, 2011
An investigation of the temperature and moisture sensitive composite properties was conducted. Results provide an evaluation of the degree of conservatism of the 50°F margin from glass transition values commonly used to determine a material system... Read More
CTE Mismatch Summary Report of the Current Baseline Design
Viewed 292 times since Sat, Nov 26, 2011
Recent testing and analysis have identified a CTE mismatch issue between the silicon ladders and the converter layer for the SuperGLAST payload design. This note summarizes the current tracker tray payload attachment baseline design... Read More
COMPOSITE HEAT DAMAGE ASSESSMENT
Viewed 367 times since Fri, Nov 11, 2011
The effects of heat damage were determined on the residual mechanical, physical, and chemical properties of IM6/3501-6 laminates, and potential nondestructive techniques to detect and assess material heat damage were evaluated. About one... Read More
Bistable composite laminates: Effects of laminate composition on cured shape and response to thermal load
Viewed 415 times since Wed, Sep 21, 2011
This paper develops a finite element (FE) approach using commercial ANSYS V11.0 software to accurately predict the cured shape of bistable composites by including the influence of manufacturing imperfections, such as resin rich areas and... Read More
Autofrettage to Offset Coefficient of Tbermal Expansion Mismatch in Metal-Lined, Composite Pipes
Viewed 668 times since Sat, Oct 8, 2011
Coefficient ofthennal expansion (CTE) mismatch between metal and composite is a major barrier for use of composites in applications that require a metal liner. The situation is critical for cryogenic applications because of the large... Read More
ASSESMENT OF INTERLAMINAR SHEAR STRENGTH OF HYBRID COMPOSITES SUBJECTED TO A FLUCTUATING HUMID ENVIRONMENT
Viewed 317 times since Sat, Oct 8, 2011
The present work aims to assess the interlaminar shear strength (ILSS) of interply woven fabric hybrid composites under the influence of a fluctuating humid environment. The ILSS values have been used for quantification of mechanical... Read More
ANALYSIS OF HYGROTHERMAL EFFECTS ON THE COMPRESSIVE STRENGTH OF CFRP LAMINATES
Viewed 356 times since Wed, Oct 5, 2011
Absorption of moisture due to long exposure degrades the mechanical properties of polymeric composite laminates. An important problem is to determine how much moisture will be absorbed by the composite when is exposed to a wet environment and by how... Read More
Analysis of edge stresses in composite laminates under combined thermo-mechanical loading, using a complementary energy approach
Viewed 213 times since Wed, Jan 30, 2013
An approximate method is presented to investigate the interlaminar stresses near the free edges of composite laminate plates that are subjected to a combined thermo-mechanical loading. The method is based upon admissible function representations of... Read More
ANALYSIS AND DESIGN OF CARBON-CARBON CONSTRAINING CORES FOR THERMAL MANAGEMENT OF ELECTRONIC COMPONENTS
Viewed 314 times since Mon, Oct 3, 2011
Carbon-carbon (C-C) composites are being investigated for potential use in coefficient of thermal expansion (CTE) constraint and thermal plane applications for printed wiring boards (PWB's). C-C containing high conductivity... Read More
An investigation of non-destructive thermographic inspection exploiting phase transition of water for moisture detection in aircraft structures
Viewed 346 times since Mon, Oct 3, 2011
In this work, thermographic investigation is done to find a suitable procedure to find penetrated water from the composite aircraft structures. Penetrated water in the composite sandwich structures can cause problems, because moisture... Read More
Advanced Thermal Imaging of Composites
Viewed 472 times since Sat, Sep 24, 2011
Composite materials were studied by scanning thermal conductivity microscope and high speed thermography. Read More
Accelerated hygrothermal cyclical tests for carbon/epoxy laminates
Viewed 358 times since Tue, Sep 13, 2011
The paper deals with the design of reasonable accelerated test conditions to assess polymer matrix composite durability when it is subjected to supersonic flight-cycles. The study is closely linked to novel application of carbon fibre polymer... Read More
A study of the mechanical behavior of thermo-oxidized composite lamina
Viewed 382 times since Tue, Sep 13, 2011
The aim of this work is the study of the mechanical behavior of polymer matrix composites reinforced with carbon fiber, which have undergone a thermo-oxidation process. The purpose of this work is the multi-scale analysis of the... Read More
A dielectric loss lnvestigation of molsture in epoxy-glass composites
Viewed 836 times since Sat, Aug 20, 2011
Dielectric loss has been used to study moisture absorption-desorption equilibria and kinetics in epoxy-glass composites. Measurements were made at a temperature of 90°C and a frequency of 200 Hz to maximize sensitivity to... Read More