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 32 for “"external loading"”.
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Behaviour of buried pipelines subjected to external loading.
The research presented in this Thesis was carried out at the University of Sheffield under the supervision of Dr I. C. Pyrah and Dr W. F. Anderson, and Mr G. Leach at British Gas Engineering Research Station (ERS). The research was financially supported by a British Gas Research Scholarship and by …
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Thermoneutral Housing Did Not Impact the Combined Effects of External Loading and Raloxifene on Bone Morphology and Mechanical Properties in Growing Female Mice
… tissue formation was induced by non-invasive external tibial loading in female mice and combined with raloxifene treatment to assess their combined effect on bone morphology and mechanical properties. Thermoregulation is an important factor that could have physiological consequences on …
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Towards a unified design-by-analysis solution to pressure vessel nozzle-shell junctions under combined loading
… pad reinforcements, stress linearization, external loading cases, limit loads, and cyclic loads. In addition, elastic, elastic - perfectly plastic, full plastic and fracture analysis were performed.Stress intensity factors are obtained with the results of finite element analysis for various …
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An analysis of interlaminar stresses in unsymmetrically laminated plates
… to extensional, compressive, or thermal loading. Symmetric and unsymmetric 0/90, +45/-45, and 0/+45 laminate stacking sequences are examined to determine the effects of mismatch between adjacent layers in Poisson’s ratio, coefficient of mutual influence, and coefficients of thermal …
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Análise por computadores digitais de estruturas reticuladas no espaço, com elemento de secção variável
… reactions of members fixed at both ends, due to external loading. These members may also have non-uniform cross-sections.
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Deformations of the pneumatic tyre
… of tyre deformations produced by arbitrary external loading, and will enable estimates to be made of the distributions of applied and reactive forces. The principle of Finite Elements is used to idealise the composite tyre structure, each element consisting of a triangle of double curvature …
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Computational Multi-material Inverse Design of Soft Robotic Actuators via Nonlinear Functional Optimization
… among other applications. However, given a known external loading, it is usually not possible to deform a soft robot into an arbitrary shape if it is fabricated using only a single material. Even if the robot is fabricated using multiple materials, there is a lack of "voxel-level" material tuning …
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The biophysical properties of plantar callus and the relationship between pressure and callus development and regression
… areas of the body has been shown to respond to external loading forces, but no research has specifically investigated the relationship between callus and pressure.A critical review of the literature explored the methods used for skin profiling through biophysical skin measurement. Skin …
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Design Optimization of Slider-Crank Mechanisms Subject to Coulomb Bearing Friction
… are for various cases of inertia, friction, and external loading.</p> <p>The optimization procedure developed minimizes a weighted sum of the input work and bearing shear stress by adjusting the mechanism's dimensions. The independent dimensions that are varied are the connecting rod length, the …
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Active control of tensegrity structures and its applications using Linear Quadratic Regulator algorithms
… structures which change to better take on their external loading. The following text explores the utilization of active control for tensegrity systems in order to achieve an adaptable structure. To start, a background of the physical characteristics of these structures is given along with the …
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Development of a 6-DOF robotic test system for studying the biomechanics of total knee replacement
… kinematics response of the knee under various external-loading conditions. The kinematics data can then be reproduced on the knee specimen. Upon simulation of knee motion, forces and displacements are evaluated from the load cell and the robot, respectively. Various TKA designs can be tested on …
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Computationally Efficient Finite Element Models of the Lumbar Spine for the Evaluation of Spine Mechanics and Device Performance
… Collection of kinematic data in response to external loading made tuning of the model stiffness possible. The improved computational efficiency of the models makes them more useful for applications requiring multiple iterations and short analysis times such as clinical and design phase …
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Development and Validation of a Computational Musculoskeletal Model of the Elbow Joint
… contact, ligamentous constraints, and muscle loading.Accurate three-dimensional bone geometry was generated by acquiring CT scans, segmenting the images to isolate skeletal features, and fitting surfaces to the segmented data. Ligaments were modeled as tension-only linear springs, and muscle …
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Atomistic simulations of deformation in Metallic Nanolayered Composites
… propagation paths and distances under the same external loading. Interfaces can improve the fracture resistance of the Nb layer in Cu/Nb MNCs by providing mobile dislocation sources to generate the plastic strain at the crack tip necessary for crack blunting. Increasing the layer thickness can …
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Hypolimnetic Oxygenation Mitigates the Effects of Nutrient Loading on Water Quality in a Eutrophic Reservoir
… and nutrients from the sediments, i.e., internal loading, while storms can increase external nutrient loading to a waterbody. One potential solution for combating hypoxia is to use side stream supersaturation (SSS), a novel form of hypolimnetic oxygenation. First, in Chapter 1, I tested the …
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Differences in Load Symmetry of the Lower Extremities in Postpartum Women During Daily Tasks and Childcare Loading Conditions
… in lower limb load asymmetry. Additionally, external loading from carrying a child may alter the degree of asymmetric loading that exists in the lower limbs. Therefore, the first purpose of this study was to investigate the effect of daily tasks on lower extremity load symmetry using metrics …
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U-SAFT⁹⁰ simulates the internal and external loads of university-level soccer match play
… Deducing movement patterns and internal and external loading through in-depth study, it may then be possible to simulate competitive match-play specific to squad or individual needs. Modern technology allows match performance to be broken down into specific periods that subsequently enables …
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Lake remediation by top-down and bottom-up management : an ecosystem-scale experiment in the English Lake District
… ecosystem services. The response of lakes to external perturbations is controlled by a complex interaction of top-down (predation) and bottom-up (resource availability) food web processes. A better understanding of how these processes interact is vital if they are to be effectively manipulated …
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Skeletal adaptation to reduced mechanical loading
… cues is poorly understood, particularly for unloading. Defining the fundamental mechanoregulation of bone adaptation is critical for the better understanding and mitigation of bone loss in astronauts as well as clinical conditions such as spinal cord injury, stroke, muscular dystrophy, and bed …
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Skeletal adaptation to reduced mechanical loading
… cues is poorly understood, particularly for unloading. Defining the fundamental mechano-regulation of bone adaptation is critical for the better understanding and mitigation of bone loss in astronauts as well as clinical conditions such as spinal cord injury, stroke, muscular dystrophy, and bed …
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