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 24 for “"Pull-out test"”.
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The single fiber pull-out test: a study of fiber/matrix interactions
The single fiber pull-out test was employed to experimentally model the failure of an embedded optical fiber in neat resin. The objective was to evaluate load transfer between resin and fiber through the evaluation of the sensitivity of the single fiber pull-out test to the physical parameters of …
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Adhesion of novel high performance polymers to carbon fibers: fiber surface treatment, characterization, and microbond single fiber pull-out test
… was evaluated using the microbond single fiber pull-out test. The objective was to determine the chemical and mechanical properties of the fiber and the polymer which affect the fiber/polymer adhesion in a given composite system. Fiber/matrix adhesion is of interest since the degree of adhesion …
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Analysis of matrix damage in single fiber composites
… composite containing matrix crack, with/without interfacial debonding. A consistent shear-lag model in cylindrical coordinates is developed to achieve this. The governing equations are solved using an eigen value technique. When a fiber is partially is debonded, compressive stresses due to …
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Influence of the Interphase on the Mechanical Properties of Nylon 66 Composites
… using both microscopic and macroscopic testing techniques. The objective was to determine how different interphase morphologies affect the adhesion and properties such as damping, ultimate stress and strain, and modulus of the composite. This was accomplished using a modified fiber …
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Surface characterization of plasma treated carbon fibers and adhesion to polyethersulfone
… An ammonia plasma was shown to remove an outer layer from the surface of the fibers. It also increased y(ds) compared to as-received fibers without affecting the non-dispersion (IPsf) XPS results indicated that methane and ethylene plasmas deposited a layer of low surface energy …
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Molecular Dynamics Model of Carbon Nanotubes in EPON 862/DETDA Polymer
… Two simulations were performed in order to test the implementation of the potential. The first one is a tensile test on a SWCNT, leading to a Young's modulus of 1.4 TPa at 300K. The second one is a pull-out test of a SWCNT from an originally uncured EPON 862/DETDA matrix.</p>
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Comparison and results of sheet pile interlock analysis
… the program is modified to simulate a sheet pile pull-out test with a new finite element mesh. The improved mesh contains a full-length sheet pile with both of its interlocks connected to two half-length sheet piles. The results are presented and compared with the results of the pull-out tests …
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The sticky property of Ypresian clays
… indicator of its high stickiness, and the cone pull-out test gives a value for adherence that quantifies the clogging potential. Ypresian clays also support the hypothesis that the Casagrande chart's U-line could be used as an evaluation method for clogging. In these ways, evaluating clogging …
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The Design and analysis of a HA/PLA pedicle screw for spinal fusion
… the objective values of simultaneous bending and pull-out of a pedicle screw or a pedicle screw augmented with calcium phosphate bone cement. Finite element analysis, Taguchi method, and an artificial neural network were used as the optimization methodology. Three-dimensional finite element method …
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The Effect of Root Canal Cleansing on the Retention of Glass Fiber-reinforced Posts
… Unicem. Retention of posts was evaluated with pull-out test using universal testing machine (0.5 mm/min) to pull the posts from the teeth. Maximum load-to-failure was recorded. One-way analysis of variance was used for the statistical analysis (α=.05). Dislodged posts were examined at 8X …
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Bond of glass fibre reinforced polymer bars in high strength concrete
… aims to compare between bond measured from a pull-out test and a hinged beam test for GFRP bars embedded in high strength concrete. Different parameters influencing bond such as GFRP bar diameter, embedment length and surface configuration were investigated in both test methods, while the bar …
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Effect of Diamond Bur and Root Canal Irrigants on Retention of Fiber Posts
… Unicem. Retention of posts was evaluated with pull-out test using universal testing machine (0.5 mm/min) to pull the posts from the teeth. Maximum load-to-failure was recorded. One-way analysis of variance was used for the statistical analysis (α=.05). Dislodged posts were examined at 8X …
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Interfacial Adhesion Evaulation of Uniaxial fiber-Reinforced-Polymer Composites by Vibration Damping of Cantilever Beam
… glass fiber reinforced polymers. Common adhesion tests include contact angle measurements, tension or compression of specially shaped blocks of polymer containing a single fiber, the single fiber pull-out test, single-fiber fragmentation test, short beam shear and transverse tensile tests, and the …
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Load transfer mechanism of fully grouted cable bolts.
Fully grouted cable bolts have been used in the mining industry for more than fifty years. However, failure of cable bolting systems still occurs in mine sites, as a result of insufficient load transfer between the rock mass and the cable bolt. Numerous research studies have been conducted to …
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Novel Concrete Reinforcement for Wave Energy Converters
… polyethylene (UHMWPE). 24 cube specimens were tested using a pull-out test where no splitting was allowed to develop to examine the bond between FRP (glass and carbon) bars and concrete. 45 beam specimens were subjected to three-point or four-point bending tests where the beams were bent until …
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Evaluation of surface roughness and bond-slip behavior of new textured epoxy-coated reinforcing bars
… 2-D and 3-D roughness parameters. Second, direct pull-out tests are conducted on concrete specimens with embedded 1) BLK, 2) smooth epoxy-coated (SEC), and 3) different types of TEC bars to compare their bond characteristics. Then, multiple 3-D finite element models are developed and calibrated to …
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Verification of a two-dimensional infiltration model for the resin transfer molding process
… were similar. This behavior was noticed for tests conducted with corn oil and Epon 815. Comparable behavior was observed for the warp direction of the TTl 1M7/8HS preform and corn oil. Fluid/fiber interaction was measured through the use of the single fiber pull-out test. The surface tension …
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Corrosion of steel reinforcement in concrete. Corrosion of mild steel bars in concrete and its effect on steel-concrete bond strength.
This thesis reports on the research outcome of corrosion mechanism and corrosion rate of mild steel in different environments (saline, alkaline solutions and concrete media) using potentiodynamic polarization technique. The study also included the effect of corrosion on bond strength between …
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Experimental investigation of bridge deck with textured epoxy-coated rebars subjected to thermal loading
… distribution in bridge decks. Furthermore, pull-out tests are carried out on the TEC rebars, and their roughness parameters are determined to contrast the results with the database reported in the literature. Finally, given the specialized equipment and time-consuming procedure needed to …
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Processing of Hemp Fibre Using Enzyme/Fungal Treatment for Composites
… composite materials. Bag retting was carried out by keeping fresh green hemp fibres in a sealed plastic bag for 1 to 2 weeks to allow natural retting to occur under sealed conditions. For white rot fungi treatments, the dried non-retted hemp fibres were gamma irradiated, and then inoculated …
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