Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 17 of 17 for “"composite strength"”.
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The interfacial shear stress failure of flawed fiber composites
… in a uniaxially aligned fiber reinforced composite. The strength of elemental volumes of fiber, used in this derivation are inferred from 1ength versus strength tests.on individual fibers. The fibers are assumed to have statistically distributed flaws that allow characterization of fiber …
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Enviro-Mechanical Durability of Graphite/Epoxy Composite Materials
… of how temperature and moisture affect the strength and fatigue behavior of carbon/epoxy composites and the issues involved in modeling these effects. Results from thermal analysis and quasi-static testing on neat resin and unidirectional laminates as a function of temperature and moisture …
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Failure processes in unidirectional composite materials
Failure processes in unidirectional composite materials subjected to quasi-static tensile load along the fiber direction are investigated. The emphasis in this investigation is to identify the physical processes taking place during the evolution of failure in these materials. An extensive …
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The compressive behaviour of unidirectional carbon fibre reinforced plastic
… results of an investigation into the compressive strength of unidirectionally reinforced carbon fibre composites when loaded parallel to the fibres. A comprehensive review of previous research is presented and from this it is clear that no overall theory e,d.sts for predicting the unidirectional …
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Horizontal Shear Transfer for Full-Depth Precast Concrete Bridge Deck Panels
… full-depth precast slab systems with their full composite strength, the horizontal shear resistance provided at the slab-to-beam interface must be quantified through further investigation. Currently, all design equations, both in the AASHTO Specifications and the ACI code, are based upon research …
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Codeformation Processing of Mechanically-Dissimilar Metal/Intermetallic Composites
… study of codeformation processing. A series of composites having mechanically-dissimilar phases were developed in which the high temperature flow behavior of the reinforcement material could be varied independent of the matrix. This was accomplished through the use of a series of intermetallic …
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Design guidelines and synthesis of a low dielectric constant inorganic composite for high performance microelectronic packaging
… studies of a controlled porosity inorganic composite using hollow ceramic microspheres. It evaluated the microsphere geometry issues and physical/electrical properties important to achieving a maximum reduction of the dielectric constant of the resulting composite with a minimum loss in …
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2 dimension woven kenaf reinforced unsaturated polyester composite
… an alternative material for synthetic fibers in composite application. Kenaf fiber is a potential reinforced material for composite due to its acceptable properties and supported by the development in Malaysian Kenaf cultivation. Previous studies have demonstrated that Kenaf fibers were …
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Tensile and Flexure Strength of Unidirectional Fiber-Reinforced Composites: Direct Numerical Simulations and Analytic Models
… stress-strain behavior in fiber-reinforced composites is used to predict the tensile strength of metal matrix composites consisting of a Titanium matrix and unidirectionally aligned SiC fibers. This model is extended to include the effects of free boundary conditions and non-constant load …
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Long Term Durability of Glass Reinforced Composites
… and long-term durability of glass-reinforced composites. The first portion of this dissertation describes work to assess the effect that post-curing has on widely used E-glass/vinyl-ester composites (E-glass/Derakane 510-A and E-glass/Derakane 8084). It is shown that post-curing can have …
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Characterization of nitrogen effects in high energy density weldments of Nitronic 40 stainless steel
… tensile testing of weld metal is conducted on composite tensile bars consisting of base metal and weld metal often leading to failure in the region adjacent to the weld due to strength mismatch at the weld interface. These tests provide composite strength but do not specifically determine the …
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Modeling Material Properties of Natural Fiber-Polymer (Grain Bags) Composites
… past, natural fiber reinforced recycled plastic composites (NFCs) have emerged as a lucrative option to not only increase the life cycle of waste plastic but also provide a market for agriculture waste by utilizing fibers from crops as a reinforcement for these composites. Changing weather …
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Cellulose fiber-reinforced thermoplastic composites: surface and adhesion characterization
… include the development of better wood fiber composites and better paper coatings. The objectives of the study were two-fold. First, to quantify the effects of surface treatments on the surface properties, and, second, to determine if adhesion can be described in terms of surface properties. A …
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Experimental and Numerical Analysis of Damage in Notched Composites
… tests were initially performed on notched composites using digital image correlation (DIC) to determine the strain profiles at selected transverse sections of the outer ply of the laminates and the static strength of the laminates. Subsequently, tension-tension fatigue tests were carried …
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The Use of Nanonindentation to Determine Composite Interfacial Shear Strength and the Effects of Environmental Aging
… the performance of fiber-reinforced polymer composites made from low-cost fiber and matrix materials. Evaluation of three sizings, poly(vinylpyrrolidone) (PVP), a carboxyl modified polyhydroxyether (PHE), and a standard industrial sizing (G'), have revealed tremendous improvements in static …
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Performance of Hemp-Fibre Reinforced Polypropylene Composite Materials
… Natural fibre reinforced thermoplastic composites are strong, stiff, lightweight and recyclable, and have the potential to meet this need. Industrial hemp fibre is amongst the strongest of the natural fibres available, and possesses a similar specific stiffness to E-glass, but with …
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Harakeke fibre as reinforcement in epoxy matrix composites and its hybridisation with hemp fibre
… motivation in research to develop natural fibre composites to replace glass fibre composites in certain applications. Harakeke fibre known as New Zealand flax or Phormium tenax used to be an important export material in New Zealand in the early twentieth century, but its production reduced due to …