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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 162 for “"Tensile stress"”.
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Martensitic Transformation of a Cobalt - Nickel Alloy Under Tensile Stress
Made available in DSpace on 2014-12-10T17:57:51Z (GMT). No. of bitstreams: 1 6812103.pdf: 2115630 bytes, checksum: c6a2e3dcde71b74905880300b68a37cc (MD5) Previous issue date: 1968
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Rheological Behavior of Bituminous Mixtures Under Flexural and Tensile Stress Conditions
Made available in DSpace on 2014-12-08T23:56:53Z (GMT). No. of bitstreams: 1 6711941.pdf: 10198713 bytes, checksum: 3cdd69903c23f74c8902e72ca2c02e4a (MD5) Previous issue date: 1967
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Predictions of Monotonic Tensile Stress-Strain Curves of Short Fiber Reinforced Polymer Composites
A method for predicting the non-linear monotonic tensile stress-strain curves of short fiber reinforced polymer composites with different fiber orientation distributions is developed.
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Tensile Stress and Thermal Growth Effects on Grain Boundary Motion in Nanocrystalline Nickel
… conducted to examine the effects of an applied tensile stress on the grain boundary motion in 5 nm3 nc-Ni specimens, half of which contain free surfaces, while the other half have periodic boundary conditions. Grain boundary sliding (GBS) and grain rotation are the deformation mechanisms …
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A simplified method for the photoelastic determination of stress concentration factors in a tensile stress field
The stress concentration factors for rectangular slots with semicircular ends with their major axes inclined to the direction of a uniaxial tension field were investigated by photoelastic methods. A major portion of this thesis deals with the problem of loading a circular disk such as to create an …
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Field investigation of subgrade non-uniformity effects on concrete pavement
… the foundation layer spatial non-uniformity on tensile stress changes in a concrete slab. For both the MI I-94 and MI I-96 roadway section, k-values were correlated from field Dynamic Cone Penetrometer (DCP) tests that were either deterministically or randomly assigned to a predefined area size. …
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Viscoelastic behavior of water-blown flexible polyurethane foams
… made from these foams. Three viscoelastic tests; tensile stress relaxation, compression load relaxation, and compression creep, were utilized to evaluate the behavior of these materials at constant temperature and/or relative humidity, RH. The tensile stress relaxation tests were performed at a 25 …
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A Microstructural Model for Flow -Induced Crystallization With Applications to the Simulation of Polymer Processes
… properties through the radial variation of the tensile stress and microstructure, as well as other polymer processes involving FIC.
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The characterization of mechanical behaviour on kenaf fibre / polypropylene composites
… filler and polypropylene (PP) as the matrix. A tensile test was carried out to determine the tensile stress of the material. The result revealed treated specimen possesses high tensile stress at 5 wt.% sodium hydroxide (NaOH) compared to 10 wt.% and 20 wt.%. The optimum tensile stress was at 40 …
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Fast rate fracture of aluminum using high intensity lasers
… studying how material microstructure affects the tensile fracture characteristics at strain rates above 106 s-1. We used the Z-Beamlet Laser at Sandia National Laboratories to drive shocks via ablation and we measured the maximum tensile stress of aluminum targets with various microstructures. …
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A finite element study of bending stress variation in meshed spur gear pairs
A study of the bending stresses in a pair of meshed spur gears using the finite element method is presented. The models analyzed were in the shape of a circular gear with five teeth or a five-tooth rack. A unit torque (1 lbf-ft) was applied as the form of nodal forces on the nodes around the bore …
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A method of testing stress-corrosion cracking in magnesium alloy FS-1 extruded bar
… susceptibility to various forms of corrosion. Stress-corrosion cracking, occurring under conditions of residual fabrication stresses or high external stresses, is a severe localized corrosion type which can bring about complete failure in most wrought magnesium alloys. Previous investigations …
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Investigation effect of external stress on hydrogen solvus in a zircaloy-4 fuel cladding alloy: application of in situ diffraction technique and mesoscale phase-field simulation
… is mainly controlled by the temperature and the stress value. The temperature effect can be modeled using the hydrogen solvus and the temperature-driven hydrogen diffusion (Soret effect). However, while correlating the effect of stress on hydride formation, a disagreement arises between the …
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Different Motions of Rotary Instruments
… fatigue resistance, lowered compressive and tensile stress; improving the predictability and effectiveness of endodontic treatment
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Early-age hydration and volume change of calcium sulfoaluminate cement-based binders
… ratio. One way to allay shrinkage-induced stresses is to use calcium sulfoaluminate (CSA) cement whose early-age expansion in restrained condition induces compressive stress that can be utilized to counter the tensile stresses due to shrinkage. In addition to enhancing the resistance …
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Origins and implications of intrinsic stress in hydrogenated amorphous silicon thin films
… (PECVD), focusing on the creation of intrinsic stresses within the films. Through experimental examination of the deposition process pressure, we model the plasma ion momentum using a combination of theoretical models and empirical trends. We find that compressive stress is controlled by ion …
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Magnetic Barkhausen Noise Testing: Steel Grades and Stress Response
… are sensitive to microstrutural variations and stress states of the material, which can adversely affect magnetic properties or structural integrity of engineering components. Therefore, magnetic Barkhausen noise has potential as a non-destructive testing technique for indirect materials …
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Relationships between grain structure and stress in thin Volmer-Weber metallic films
… of these polycrystalline films, the intrinsic stress for materials of sufficiently high mobility often evolves through three distinct stages, switching from compressive to tensile and back to compressive. Many studies of stress evolution during this process have indicated that a tensile stress …
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Quasi-Static Tensile and Fatigue Behavior of Extrusion Additive Manufactured ULTEM 9085
… in service. In this study, quasi-static tensile and cyclic fatigue tests were performed on ULTEM 9085 samples fabricated by fused deposition modeling (FDM). First, tensile tests were conducted following ASTM D638 on three different build orientations with default build parameters to …
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Early Age Stresses and Creep-Shrinkage Interaction of Restrained Concrete
The analysis revealed stress-induced shrinkage as a major mechanism of drying creep for plain and fiber reinforced concrete (FRC). Microcracking forms a significant portion of drying creep of plain concrete, but it is less significant in FRC. Therefore, creep of FRC is dominated by real mechanisms, …
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