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 35 for “"stress transfer"”.
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Stress transfer between multi-seam longwall mines
… will require the accurate prediction of stress transfer between adjacent seams. The available knowledge on criteria controlling stress transfer has been exhaustively reviewed and critical factors affecting multi-seam mining investigated. Young's Moduli of rock layers, thickness of rock …
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Stress Transfer and Structural Failure of Bilayered Material Systems
… engineered structures. Understanding how loads transfer within these structural systems is necessary to predict failure and develop effective designs. Existing methods for evaluating the stress transfer in bilayered materials are limited to overly simplified models or require experimental …
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Matrix-fiber stress transfer in composite materials elasto-plastic model with an interphase layer
The matrix-fiber stress transfer in glass/epoxy composite materials was studied using analytical and experimental methods. The mathematical model that was developed calculates the stress fields in the fiber, interphase, and neighboring matrix near a fiber break. This scheme takes into account the …
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The electrostatic polarization mechanism of the electrorheological response
… field. Many applications of this technology in stress transfer devices are possible, but development of these devices is currently limited by a lack of understanding of the fundamental mechanisms. In this dissertation, the mechanisms controlling ER response are investigated.
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Predicting mechanical performance of adhesively bonded joints based on acousto-ultrasonic evaluation and geometric weighting
… the bonding is uniform throughout the joint the stress distribution depends on the material properties and the joint geometry. Knowledge of the bond properties and the stress distribution and magnitude can then be used to determine failure initiation, damage growth, subsequent stress …
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Cohesive Zone Modelling of Fiber–Matrix Interface in Composite Materials
… by the fiber–matrix interface which controls stress transfer and directly influences damage initiation, crack propagation, and fracture behaviour. The interface properties are quantified through the Interfacial Shear Strength (IFSS) and fracture energy, both serving as key indicators of …
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Postbuckling Analysis of Delaminated Composite Plates Under Compression (Composite Laminates)
… of the delaminated ligament, interlaminar stress transfer and strong material anisotropy, the singular stress field near the crack-tip must be considered for crack stability study. A rotational, singular hybrid finite element approach is taken for studying crack-tip stresses during …
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Stability assessment of entry roofs in underlying multiple seam mines
… are vulnerable to failure under the influence of stress transferred from the upper seam workings. Overburden depth, innerburden thickness, percentage of hard rock in the innerburden and relative location of pillars in the two seams are some of the factors known to influence stress transfer and …
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The influence of the microstructural shape on the mechanical behaviour of interpenetrating phase composites
… model). An examination of microstructural stress distributions showed that preferential stress transfer occurred along paths of low compliance. This provided an explanation of how the improved contiguity of the stiffer (or stronger) phase could enhance the macroscopic effective properties …
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Graphene Oxide Reinforcement in Plasma Sprayed Nickel-5%Aluminum Coatings
… the mechanisms of dislocation strengthening and stress transfer previously reported in graphene oxide reinforced Aluminum composites formed by flake powder metallurgy. It was also observed that the energy released by the combustion of graphene oxide helps to uniformly melt the Nickel particles …
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Fatigue life prediction on nickel base superalloys
… surface pores or providing significant local stress transfer to shift initiation to sub-surface pores. Complementary work has been carried out using PWA1484 and Rene N5. Extensive data has been collected on initiating pores for all 3alloys. A model has been developed to predict fatigue life …
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The role of heterogeneity in long-range interacting systems : from nucleation to earthquake fault systems
… Earthquake fault systems under long-range stress transfer with varying types of heterogeneity will be the second system of interest. First I will review the use of the intervention method to determine the time and place of nucleation and extend its use as an indicator for spinodal …
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Experimental and Numerical Investigation of the Mechanical Properties of Novel Bamboo-Timber and Bamboo Composites for Sustainable Construction
… and timber layers was fabricated to improve stress transfer, interfacial bonding, and dimensional stability while maintaining the environmental advantages of bio-based materials. Three mechanical tests were conducted using a universal testing machine (UTM). The mechanical tests consist of …
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Low velocity impact response of rc beam with artificial polyethylene aggregate as concrete block infill
… The concrete near the neutral axis acts as a stress transfer medium between the compression and tension zones. Partial replacement of the concrete near the neutral axis could create a reduction in weight and savings in the use of materials. In this experimental work, APEA and MAPEA were …
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Numerical modelling of time-dependent cracking and deformation of reinforced concrete structures
… with bond-slip interface elements to model stress transfer between concrete and steel. Creep of concrete has been incorporated into the models by adopting the principle of superposition and the time-dependent development of shrinkage strain of concrete is modelled using an approximating …
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The development of shaft friction and end bearing resistance for dynamically driven model piles
… at all stages. Changes in the shear and vertical stresses at the sand clay interface were also monitored and the final deformation of the clay beneath the pile tip.<br/>The data showed:-<br/>1. The pile top impact force was dependant on ram impact velocity only.<br/>2. The transient forces at the …
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The development of shaft friction in semi-fullscale piles passing through granular soils
The present study examines the load transfer mechanism and subsequent soil displacements around a 0.114m diameter pile passing through a sand stratum.<br/><br/>The available literature on deep foundations is reviewed. It was found that the amount of literature pertaining to pile behaviour in …
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Motor Learning Effects of Two Types of Stressors: Implications for Practice Specificity
Various types of stress have been found to have both positive and negative effects on motor performance (Szalma & Hancock, 2011; Van Gemmert & Van Galen, 1997). One potential explanation for these diverse findings is that stress increases the amount of neuromotor noise in the system (Van Gemmert, …
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Microseismic observations in the Ceres-Tulbagh aftershock zone, Western Cape, South Africa, and their tectonic implications
… Namaqua Natal Metamorphic complex from far field stress transfer from the Southwest Indian Ridge. It is proposed, albeit on speculation, that the presence of microseismic activity along the vertically oriented fault zone could be the manifestation of an incipient plate boundary formation.
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Fabrication And Damping Behavior Of Particulate BaTiO3 Ceramic Reinforced Copper Matrix Composites
… damping in barium titanate particles or, poor stress transfer from matrix to reinforcement because of the weak and porous copper-barium titanate interface.
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