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 20 of 66 for “"Tensile modulus"”.
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Single Polymer Micro- and Nano- Composites
… microfibers showed a outstanding improvement of tensile modulus (up to 160 %) compared with the unfilled matrix. FESEM observations evidenced some pull-out phenomena, indicating a poor interfacial adhesion. After a surface treatment on the reinforcement, a composite containing up to 20 wt% showed …
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Experimental studies and modeling of mechanical properties and morphologies of in situ polymer composites
… A new method was also developed to predict the tensile modulus of the injection molded blends by introducing the effects of injection molding parameters, based on the Halpin-Tsai composite model. The relationships between the structure and mechanical properties of the blends, between processing …
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Generation of Multi-Scale Thermoplastic Composites for Use in Injection Molding and Fused Filament Fabrication
… analyzed based on the criterion of maximizing tensile properties of multi-scale WTCs and minimizing thermal degradation of the matrix. Under the optimum processing conditions, the in situ injection-molded multi-scale WTCs exhibit a 26% and 34% tensile modulus and strength enhancement, compared …
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Advanced Dispersion Strategies of Carbon Nanofillers and their use to enhance Mechanical and Electrical Properties of Polyacrylonitrile Fibers
… carbon nanotubes (MWNTs). These fibers with tensile modulus of up to 32.1 GPa and electrical conductivity of 2.2 S/m rival some intrinsically electrically conducting polymer fibers without doping. Nanocomposite carbon fibers with up to (a) 25 wt% SWNTs and (b) 24 wt% carbon black and 3 wt% …
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Production of Multi-layer and Cell-Containing Collagen Membranes Using Direct Electrophoretic Deposition
… increased as multiple layers were deposited. The tensile strength and trouser tear resistance of the multi-layer collagen membranes were tested at 37 °C in-aqua. Increasing the number of layers from 1 to 6, resulted in increases in the tensile modulus from 0.43 to 0.78 MPa, the ultimate tensile …
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The development of sub-micro filler enhanced polymer composites
… nylon-6 and polypropylene. The predicted Young's modulus and strengths of developed composites are as high as 3.3 GPa and 81 MPa at 5wt% silica flake content as well as 11.75 GPa and 301MPa at 30wt% flake fraction, respectively. Experimental results show that tensile modulus and strengths of the …
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Measuring particle alignment in particleboard and predicting selected mechanical properties of oriented boards
… functions. Models were developed to compute the tensile and shear modulus of particleboard with various degrees of orientation. The tensile model worked well for several board types. The shear model, however, was only effective for thin plates. Poisson's ratio, the tensile modulus, modulus of …
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Stress concentration around dowel bars in jointed rigid concrete pavements
… 18000 lb. It was found that significantly large tensile stresses develop in the concrete on both sides of the loaded dowel. The magnitude of the tensile stress approaches the tensile modulus of rupture of concrete causing tensile cracks to develop on both sides of the dowel bar. The comparison …
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I. Solubility and blend studies of nitrocellulose II. Relaxation properties of thin film coatings: the role of surface topography
… experiments were done in order to evaluate the tensile modulus of the nitrocellulose blends. In the second part of this thesis, both dynamic mechanical thermal analysis and dielectric thermal analysis were used to evaluate the relaxation properties of thin film polysulfone coatings and the …
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Modeling Material Properties of Natural Fiber-Polymer (Grain Bags) Composites
… was reviewed with usable data pertaining to tensile properties of NFCs extracted and analyzed to generate property trends relating material composition and manufacturing parameters. Polynomial regression models were derived for predicting these properties for various processing conditions. …
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Spray deposition of cork reinforced polyester
… a polyester matrix. The material was tested for tensile and flexural properties following relevant ASTM standards. The material was found to have a tensile strength of 4.4 MPa and tensile modulus of 850 MPa. The flexural strength and modulus were 9 MPa and 830 MPa, respectively. Adding a …
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Preparation, Characterization, and Application of Molecular Ionic Composites for High Performance Batteries
… stability, and widely tunable and high tensile modulus even at relatively low polymer content. MICs show great promise as solid electrolytes for solid state batteries. This dissertation describes the preparation and characterization of MIC electrolyte membranes. These transparent, …
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Generation of Recyclable Liquid Crystalline Polymer Reinforced Composites for Use in Conventional and Additive Manufacturing Processes
… hand, glass fiber/PP composites decreased 30% in tensile strength and 5% in tensile modulus after three reprocessing cycles. The micro-mechanical modeling demonstrated the deterioration in mechanical properties of GF/PP was mainly attributed to the fiber breakage that occurred during compounding …
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Lyocell Fiber-Reinforced Cellulose Ester Composites - Surface and Consolidation Considerations, and Properties
… of cellulose acetate butyrate (CAB) and high modulus, continuous, regenerated cellulose fiber (lyocell). Of particular concern were both the interfacial adhesion between the fiber and matrix and the consolidation process in the manufacture of these composite materials. Interfacial adhesion was …
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Synthesis and characterization of polymer nanocomposites
… in the polymer resulted in increased 2% secant tensile modulus, and decreased tensile strength and elongation at break, to different extents. While the presence of SWNT improved the mechanical properties of the polymer, the presence of FUL hampered the mechanical properties. Storage modulus of …
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Mechanical Properties of Random Discontinuous Fiber Composites Manufactured from Wetlay Process
… 0.50 at an increment of 0.05 were molded. Both tensile and flexural tests were conducted. The test results showed a common pattern, i.e., the modulus and strength of the composite increased with the fiber volume fraction to a maximum and then started to descend. The test results were analyzed to …
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ASPECTS OF RECYCLING OF CARBON FIBRE REINFORCED POLYETHERETHERKETONE (CF/PEEK)
… Cox Shear-Lag model. Mechanical testing such as tensile and flexural tests were conducted. Differential Scanning Calorimetry (DSC) was used to investigate the recycled material's crystallinity and also its transition temperature. Other techniques such as Scanning Electron Microscopy (SEM) and …
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Characterization of Carbon Mat Thermoplastic Composites: Flow and Mechanical Properties
… strength and higher stiffness carbon fibers. The tensile strength and modulus and the flexural strength and modulus of the CMT materials were calculated for fiber volume fractions of 10-25%. Additionally, the length of the fiber (12.7 mm or 25.4 mm) was varied and four different fiber treatments …
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Moisture diffusion through neat and glass-fiber reinforced vinyl ester resin containing nanoclay
… Glass transition temperature and storage modulus in torsion were found to increase significantly with increasing amount of nanoclay in polymer. Tensile tests and impact tests were carried out to quantify the influence of nanoparticles on mechanical properties of nanocomposite samples. …
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Wet-spinning and thermal analysis of collagen fibers incorporating hydroxyapatite in mixed and coated form
… temperature between these two fibers. However, tensile modulus was seen to be highest for pure collagen fibers and the least for the composite fibers. Thermogravimetric analysis was performed on the fibers to monitor the weight reduction with respect to temperature. The highest reduction was …
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