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Showing 1 to 20 of 69 for “"pullout"”.
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Pullout Strength of Epoxy Anchors Installed Underwater
… a submerged anchor installation has on the pullout strength of epoxy anchors. Two different epoxies were tested at embedment depths of two, four, and six bar diameters. These tests utilized three distinct installation procedures under dry and submerged conditions. The testing program …
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Single Straight Steel Fiber Pullout Characterization in Ultra-High Performance Concrete
… to characterize single straight steel fiber pullout in Ultra-High Performance Concrete (UHPC). Several parameters were explored including the distance of fibers to the edge of specimen, distance between fibers, and fiber volume in the matrix. The pullout load versus slip curve was recorded, …
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A finite element analysis of the pullout capacity of suction caissons in clay
Suction caissons are increasingly becoming the foundation of choice for offshore structures in deep water. They are used extensively in Tension Leg Platforms and provide the most efficient foundations for many offshore wind turbine structures. One of their major advantages is the ability to …
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A Comparison of Inclusion and Pullout Programs on Student Achievement for Students with Disabilities
… inclusion classes versus special education pullout classes) for students with disabilities in grades 3 through 8 on student achievement in 4 counties in Southwest Virginia.</p><p>Similar studies have been conducted with varying results noted. The review of the literature includes 18 studies …
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Optimization of Pedicle Screw Depth in the Lumbar Spine: Biomechanical Characterization of Screw Stability and Pullout Strength
… strength, decreasing the risk of loosening or pullout. The purpose of this study was to test the pullout strength of transpedicular pedicle screw insertion depth subsequent to cyclic loading, which simulates post-operative loosening in the osteoporotic lumbar spine.Methods: Ten osteoporotic …
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Frontal Plane Humeral Elevation Effects on the Pullout Strength of Suture Anchors Used in Rotator Cuff Repair
… eyelet breakage, suture failure, and anchor pullout. These failure modes necessitate intervention to reattach the tendon thus prolonging the healing period. Identifying and minimizing these failure modes will ensure optimum healing. There are two goals of this study. Firstly, the paper will …
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Toughening mechanisms in weak matrix ceramic composites
… and effects determined using single fiber pullout specimen or a single rod pullout specimen. Single fiber pullout specimens with a damaged zone (by the oxidation of SiC fiber in situ) produced higher frictional stress than debonding strength. Frictional stresses increased up to 6.4 ± 3.4 …
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An Examination of Attitudes and Actions of Regular Classroom and Gifted Teachers Toward Differentiating for Gifted Learners Involved in a Pullout Gifted Program
<p>Bridging the gap in student performance has changed the teaching practice in classrooms across America. Educators have the responsibility to teach all learners. There is a need for instruction to be tailored to boost the higher-level achievers and balance the gaps. This study examined the …
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Screw fixation of implants to the spine
… human cancellous bone, respectively. The screw pullout force from these bone models decreased with polyurethane foam density, implying that the quality of bone principally influences the strength of screw fixation. The angle of screw insertion and thread design was also found to affect screw …
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Relações empíricas para estimativa da resistência ao arrancamento de ancoragens
… soil type, anchorage type, test methods and pullout resistance methods of determination. The database consisted of 445 tests, of which 24 were developed in laboratory and the others in situ. The majority of the tests were carried out between Rio de janeiro and São Paulo. In addition, only …
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Glass Fiber Reinforced Polymer Bars as the Top Mat Reinforcement for Bridge Decks
… evaluate the disparity in results between direct pullout tests, and beam end bond tests. Results from the experimentally performed beam end bond test were compared to previous literature involving the direct pullout tests. Results from the performed beam end bond tests were higher than all of the …
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Bond and Material Properties of Grade 270 and Grade 300 Prestressing Strands
… Producers (NASP) Bond Test and Large Block Pullout Test (LBPT) were performed on six different strand grade and strand size combinations. Both of the tests are simple pullout tests on untensioned strand. The results for each strand type were compared to one another as well as to measured …
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In Situ Diagnostics for Multiple Allergens in Food
… ultimate capacity of the anchor during pullout was analysed through centrifuge modelling in normally consolidated kaolin clay. The effect of the anchor‟s shape on its pullout capacity was analysed by varying the space between two anchor flukes in a series of tests. The anchor shape had …
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Plate anchors for offshore foundations in sand and clay
… ultimate capacity of the anchor during pullout was analysed through centrifuge modelling in normally consolidated kaolin clay. The effect of the anchor‟s shape on its pullout capacity was analysed by varying the space between two anchor flukes in a series of tests. The anchor shape had …
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Local Displacements and Load Transfer of Shape Memory Alloys in Polymeric Matrices
… SMA and an epoxy matrix were measured using pullout tests. The effects of various mechanical and chemical surface treatments on the bond strengths were examined. In-situ out-of-plane displacements of two-way trained SMA wires in epoxy were measured using heterodyne microinterferometry. The …
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Engineering properties of ring shaped polytheylene terephthalate (RPET) fiber self-compacting concrete
… a weak interfacial bond with cement paste in the pullout load because of the lamellar shape of fibers. Therefore, ringshaped PET (RPET) fibers are introduced in this study to overcome the limitations of traditional straight, lamellar, or irregularly shaped fibers. RPET fibers are mainly designed …
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Low modulus, oxidation-resistant interface coatings for SiC/SiC composites
… failed gracefully, 1.e., there was fiber pullout and debonding probably at the matrix-coating interface. Minicomposites that contained tows coated using MOD were too weak to be tested for tensile strength. This necessitated the deposition of a thin (~ 30 nm) layer of carbon both on the …
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Manufacturing and fracture of hierarchical composite materials enhanced with aligned carbon nanotubes
… is less than expected based on idealized fiber pullout models, and is attributed to multiple and competing modes. Fractography reveals toughening mechanisms for both aerospace and marine epoxy laminates at several length scales, from the pull-out of A-CNTs to microfiber tow breakage. The …
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