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the NDT Study of Metal Composite Material Tube
Viewed 339 times since Wed, Sep 5, 2012
In view of the shedding problem of compound layer of composite material tubes in metallurgical industry, UT,ET and the special-purpose sensors are used to carry out the testing of the parent metal and the compound layer. According to practical... Read More
THE ELECTRON BEAM CURE OF FIBERGLASS/EPOXY PREPREGS
Viewed 325 times since Tue, Aug 21, 2012
Recently developed epoxy resin prepregs were electron beam cured and experimentally explored to determine their suitability for use in an aerospace-quality aircraft component. There were two major goals for this program. The first was to determine... Read More
THE ELECTRON BEAM CURE OF EPOXY PASTE ADHESIVES
Viewed 255 times since Tue, Aug 21, 2012
Recently developed epoxy paste adhesives were electron beam cured and experimentally explored to determine their suitability for use in an aerospace-quality aircraft component. There were two major goals for this program. The first was to determine... Read More
The Effect of Processing, Glass Finish, and Rheology on the Interlaminar Shear Strength of a Woven e-Glass Reinforced Polymer Matrix Composite
Viewed 246 times since Thu, Jul 26, 2012
Laminated woven glass reinforced polymer matrix composites (PMC) are commonly used in the electronics industry as a robust and effective substrate for circuit boards. In such applications, reliability is extremely important. The laminated composites... Read More
The effect of processing conditions on magnetic and electric properties of composite materials used in nonconventional magnetic circuits
Viewed 219 times since Thu, Jul 26, 2012
The using in alternating current of materials for electromagnetic circuits requires them high inductions and low dynamic (eddy-current) losses. These are strongly influenced by the work frequency and induction, and also by the magnitude of density... Read More
Strategic Opportunities and Challenges for Composites R&D in South Africa – A CSIR Perspective
Viewed 133 times since Fri, Apr 26, 2013
The utilisation and prominence of composite materials have been increasing significantly overthe past decade in technologically demanding industry sectors, such as aerospace and automotive. It has been accompanied by growing needs for research and... Read More
STATICS AND DYNAMICS OF COMPOSITE STRUCTURES WITH EMBEDDED SHAPE MEMORY ALLOYS
Viewed 209 times since Fri, Apr 26, 2013
The use of different composite materials has been continuously growing over recent decades. Although composite materials have found many applications during that time, extensive research is still being carried out in order to expand this field. New... Read More
Special Graphites and Carbide-Graphite Composites Developed at LASL
Viewed 258 times since Wed, Aug 22, 2012
Well-characterized materials containing either TaC and graphite or pure graphite vere fabricated utilizing powder metallurgy techniques that included hot pressing or hydrostat1c pressing and subsequent high temperature heat treatment. Read More
Residual stresses in thermoplastic composites – a study of the literature Part III-Effects of thermal residual stresses
Viewed 86 times since Sun, May 15, 2016
This paper is the third part in a series of review papers on residual stresses in thermoplastic composites. The first two parts were dedicated to the formation of thermal residual stresses and experimental techniques to detect these stresses,... Read More
Residual Stresses due to processing of composite tibes
Viewed 192 times since Thu, Dec 6, 2012
X-ray and neutron diffraction were used to characterize residual stresses in composite tubing of a corrosion-resistant clad alloy on carbon steel. A useful X-ray method, based on the measurement of the fcc reflection using Cr Kb radiation, was... Read More
Photodegradation in Ballistic Laminates - Spectroscopy and Lifetime Extension
Viewed 218 times since Fri, Oct 26, 2012
Several years ago, we in the Materials and Process Sciences Center (Grg. 1800) were asked by Dept. 9613 to study the materials aging issues which had led to the loss of ballistic protection by Armored Tractor (AT) windshields and windows. We... Read More
Performance Characterization of a Shape Memory Composite Mirror
Viewed 216 times since Fri, Oct 26, 2012
Deployable optics comprised of an electroformed, replicated nickel optical surface supported by a reinforced shape memory resin composite substrate have the potential to meet the requirements for rapid fabrication of lightweight, monolithic,... Read More
Inexpensive Delivery of Cold Hydrogen in High Performance Glass Fiber Composite Pressure Vessels
Viewed 199 times since Thu, Nov 15, 2012
Delivering hydrogen in today’s low capacity compressed hydrogen tube trailers is expensive. Substantial cost reductions appear possible with development of advanced pressure vessels and a broadened range of thermodynamic conditions under which... Read More
Improved lightning protection system enhances the reliability of multi-MW blades
Viewed 272 times since Mon, Sep 10, 2012
Lightning strikes are the worst enemy of wind turbine blades. The powerful energy discharge during lightning strikes can cause severe damage to blades, at worst leading to complete failure. Offshore wind turbines are the most exposed, as the blades... Read More
High Strain-Rate Model for Fiber-Reinforced Composites
Viewed 248 times since Fri, Apr 5, 2013
Numerical simulations of dynamic uniaxial strain loading of fiber-reinforced composites are presented that illustrate the wide range of deformation mechanisms that can be captured using a micromechanics-based homogenization technique as the material... Read More
GALVANIC CORROSION OF CARBON AND STEEL IN AGGRESSIVE ENVIRONMENTS
Viewed 411 times since Thu, Oct 18, 2012
The demand for the use of carbon-fiber-reinforced plastics (CFRP) in rehabilitation of deteriorating infrastructure is increasing worldwide. The design characteristics of reinforced concrete or steel members can be enhanced significantly by epoxy... Read More
Extreme damping in compliant composites with a negative-stiffness phase
Viewed 306 times since Tue, Sep 11, 2012
Compliant composite unit cells were made with negative stiffness constituents. Flexible silicone rubber tubes were incorporated in a post-buckled condition to achieve negative sti€ffness. Large peaks in the mechanical damping tan were observed in... Read More
Experimental studies of thin-ply laminated composites
Viewed 615 times since Sun, Jun 17, 2012
A new processing method was developed for spreading fiber tows to make thin-ply laminated composites. The present method with a constant airflow through sagged fiber filaments can efficiently spread the thick tows without damaging any fibers. This... Read More
Electromagnetic Shielding Properties of Carbon Fibre Composites in Avionic Systems
Viewed 455 times since Sun, Mar 4, 2012
The shielding properties of carbon fibres in composite materials are compared for two particular lamination examples used in avionics. Plane wave shielding theory and effective medium theory are compared in this work and found to provide the same... Read More
Dynamic Characterization of Short Duration Stress Pulses Generated by a Magnetic Flyer Plate in Carbon-FiberI Epoxy Laminate
Viewed 279 times since Sat, Jan 7, 2012
There is a great deal of interest in characterizing the dynamic mechanical behavior of laminated carbon-fiber/epoxy composites for military and aerospace applications. Current research efforts have been directed at measuring the strength lost because... Read More
DIRECTLY SUSCEPTIBLE, NONCARBON COMPOSITE CRUCIBLE
Viewed 289 times since Sat, Jan 7, 2012
In view of the above need, it is object of this invention to provide a crucible that can be induction heated without cracking. Another object of this invention is to provide a crucible that can be induction heated and allow for melting of reactive... Read More
DIRECT FIBER STRENGTHENING IN THREE DIMENSIONAL RANDOM-ORIENTED SHORT-FIBER COMPOSITES
Viewed 248 times since Sat, Jan 7, 2012
A theory for direct fiber strengthening in random-oriented short-fiber composites is developed. The theory adopts a maximum load composite failure criterion and takes into account the fiber orientation effect on the probability of a fiber being... Read More
DEVELOPMENT OF A NEW GENERATION OF FILAMENT WOUND COMPOSITE PRESSURE CYLINDERS
Viewed 398 times since Wed, Jan 4, 2012
A new generation of composite pressure vessels for large scale market applications has been studied in this work. The vessels consist on a thermoplastic liner wrapped with a filament winding glass fibre reinforced polymer matrix structure. A high... Read More
CTH Reference Manual: Composite Capability and Technologies
Viewed 344 times since Sat, Nov 26, 2011
The composite material modeling enhancements incorporated into CTH have added much needed capability for modeling non-isotropic materials inside of an Eulerian shock physics hydrocode. The first capability added is the ability to insert... Read More
Continuum Models for Deformation: Discontinuous Reinforcements
Viewed 301 times since Sat, Nov 26, 2011
Underlying the mechanics of particle reinforcement of ductile matrix is the assumption that the size of the particles and the spacing between the particles are sufficiently large such that continuum plasticity can be used to... Read More
COMPOSITES CONTAINING BARRIER LAYERS FOR REDUCED PERMEABILITY AT CRYOGENIC TEMPERATURES
Viewed 392 times since Fri, Nov 11, 2011
To help prevent leakage that may occur if cracks develop in a cryogenic composite pressure vessel due to thermo-mechanical fatigue, liners are occasionally implemented. However, liners can be difficult to fabricate and maintain, and mismatch of... Read More
Composite Chronicles: A Study of the Lessons Learned in the Development, Production, and Service of Composite Structures
Viewed 286 times since Tue, Nov 8, 2011
The development of advanced fiber composites in the 1960's brought aircraft designers a new material option comparable to the introduction of aluminum some 40 years earlier. Carbon fibers, with moduli and strengths... Read More
CHARACTERIZATION OF MODE I PROPERTIES OF FULL-DEPTH Z-FIBER STUBBLE IN CO-BONDED COMPOSITES
Viewed 364 times since Tue, Nov 8, 2011
Z-pins are small diameter carbon rods that are ultrasonically inserted through composite laminates in the z-direction to provide extra resistance to crack growth and delamination. They are normally inserted through co-cured composites, but... Read More
A GENERALIZED DIFFERENTIAL QUADRATURE SOLUTION FOR LAMINATED COMPOSITE SHELLS OF REVOLUTION
Viewed 294 times since Wed, Aug 31, 2011
In this paper, the Generalized Differential Quadrature (GDQ) Method [1] is applied to study laminated composite shells of revolution. The mechanical  model is based on the so called First-order Shear Deformation Theory (FSDT), deduced... Read More