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 99 for “"Tensile Strain"”.
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Verification of the dissipated energy based fatigue model using field data
… intermediate layer. To achieve this goal, tensile strains at the bottom of the top hot-mix asphalt (HMA) layer must be limited to below a certain value known as the fatigue endurance limit (FEL). In this thesis, a method for estimating the allowable strain in the asphalt layers of flexible …
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Flexural Resistance Factors for Partially Prestressed Members Using ASTM A 1035 Reinforcing Steel
… to AASHTO LRFD and ACI 318 for increasing the strain limit that defines tension-controlled members using high-strength steel. The codes state that a tension-controlled member is any member with strain in the extreme tensile steel greater than 0.005. This limit is independent of the steel type. …
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Concepts for Mechanistic-Empirical Design Procedure for Extended Life Hot Mix Asphalt Pavements With a Multi-Layered Structure
… difference between the devices. The horizontal tensile strain pulse duration is not affected significantly by the thickness and multi-layered system of the pavements studied.
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GeSi photodetectors and electro-absorption modulators for Si electronic-photonic integrated circuits
… on a Si platform with CMOS compatibility. Tensile strain is introduced into the GeSi material to enhance its optoelectronic properties. The effect of tensile strain on the band structure of Ge is systematically studied, and the deformation potential constants of Ge are derived from the …
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Epitaxial Ge/Il-V Heterostructures : MOCVD growth, characterization, and applications
… Theoretical studies have predicted that tensile strain enhances both electron and hole mobilities of Ge to levels much greater than those in unstrained or compressively-strained Ge and Si. Additionally, high enough levels of tensile strain have been postulated to alter the band structure …
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Strain-engineered CMOS-compatible Ge photodetectors
… epilayers and Si substrates was used to engineer tensile strain upon cooling from the growth temperature. This 0.2% tensile strain results in a lowering of the direct transition energy in Ge by 30 meV and extends the responsivity curve to near 1.6[mu]m. Design rules are given for high speed and …
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Thin circular metal plates subjected to localised impulsive loads
… the deformation from the first, predict the strains in the plate. The first model or theoretical displacement model presents a stepwise velocity field approach, in which it is assumed that the explosive burns as a set of discretised rings spreading from the centre of the plate to the outer …
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Ge-on-Si light-emitting materials and devices for silicon photonics
… important 1.55 pm telecommunication band. Tensile-strained n+ germanium is capable of behaving like a direct band gap material owing to the direct band gap shrinkage upon tensile strain and the state-filling in the indirect L valleys with extrinsic electrons from n-type dopants. Our …
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Germanium and GeSn based Quantum Well Lasers and Nanoscale Multi-gate FETs
… gate dielectrics, vertical scaling, lattice strain engineering, novel material developments and, lately chiplets as well as multi-die vertical packaging. As conventional Si CMOS approaches a roadblock, this work presents research on Germanium-based multi-gate devices providing promise for …
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THERMAL FATIGUE DAMAGE OF ASPHALT PAVEMENT
… loading. For each cycle of traffic loading, tensile strain develops at the bottom of AC layer of an asphalt pavement. Some localized damages occur in the material at minute-scale due to this developed tensile strain. These damages cause decrease in stiffness (E) of AC. Damage caused by a …
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Theoretical studies of the optoelectronic properties of semiconductor quantum wells
… With this new formulation, the effect of strain on the band structure is studied systematically for both the compressional and tensile strain. The importance of the coupling between the heavy-hole, light-hole bands and the spin-orbit split-off bands is especially pointed out.
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Physical Performance of Geomembranes Used in Heap Leach Pad Applications
… in heap leach pads. There is a need to quantify tensile strains in the geomembrane that could affect short-term puncture and long-term performance of the GMB. In this thesis, short-term tensile strains arising from indentations caused from the material placed both below and above the geomembrane …
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Plastic Relaxation of Highly Tensile Strained (100) Ge/InGaAs Heterostructures
Biaxial tensile strain has been shown to greatly enhance the optoelectronic properties of epitaxial germanium (Ge) layers. As a result, tensile-Ge (and#949t-Ge) layers grown on larger lattice constant InGaAs or GeSn have attracted great research interest. However, no previous studies have …
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External field effects on electronic and ionic defects in functional oxides: Experiments and simulations
… and memory devices. Mechanical strain and high electric fields are known to commonly exist in thin film functional oxides and significantly affect the electronic and ionic defect concentrations, reaction energy landscapes, and transport properties. This thesis focuses on …
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The role of autophagy in protecting periodontium integrity, and lipopolysaccharide-induced osteoclast differentiation
… used to establish in vitro models for mechanical strain and chronic inflammation, and the activation and differentiation of these bone marrow derived cells were analysed in response to the conditions created in these model systems. Orthodontic tooth movement invokes constant mechanical force onto …
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Control of texture and formability in ferritic stainless steels.
… The annealing textures have beencorrelated with tensile strain ratio measurements and from this correlation it has been possible to select combinations of cold rolling reduction and annealing treatments for texture control to improve deep drawability. Electron microscope examination has been used …
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Cyclic Loading Effects on Craniofacial Strain and Sutural Growth in Pigs
… to the nasofrontal suture (NFS), 2. To explore strain transmission resulting from cyclic loading of the NFS both ex vivo and in vivo and 3. To characterize the effects of cyclic loading on sutural growth. Methods: Tensile loads cycling at 2.5 Hz were applied to one NFS of abattoir pig heads …
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High-Strain Rate Tensile Characterization Of Graphite Platelet Reinforced Vinyl Ester Based Nanocomposites Using Split-Hopkinson Pressure Bar
… are characterized under both dynamic tensile and compressive loading. Dynamic direct tensile tests are performed applying the reverse impact Split Hopkinson Pressure Bar (SHPB) technique. The specimen geometry for tensile test is parametrically optimized by Finite Element Analysis …
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The Electrical and Mechanical Study of the Flexible Organic Light Emitting Diodes
… when the OLED layers were applied with a tensile strain and compressive strain. It is observed that the compressive strain caused less damage than the tensile strain during the bending. It is also observed that a 4 µm thick buffer layer does protect the OLED device in terms of EL …
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Actuation of shape memory polymer using magnetic fields for applications in medical devices
… Dynamic Mechanical Thermal Analysis (DMTA), tensile strain recovery tests, and Differential Scanning Calorimetry (DSC) were used to measure the mechanical effects of various particle volume contents and sizes on shape memory polymer. These tests suggest that the proposed method of actuation …
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