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 11 of 11 for “"Material hardness"”.
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The effect of operating parameters on the wear behaviour of disc poppet valves in reciprocating slurry pumps
… of the valves can be achieved through increasing material hardness, reducing valve closure velocity, slurry density and valve angle. A detailed study has been made of the mechanisms contributing to valve wear. It has been established that both percussive impact and three body abrasion wear …
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Performance and Usability of Flexible Membrane Keyboards
… flexible keyboards that differed in terms of material hardness (hard, medium, or soft) and key contact point shape (circular or square) were studied. The results supported the hypothesis that both typing performance and usability of the flexible membrane keyboard were affected by material …
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Developing a methodology for reducing diamond breakage within processing plant
… a problem experienced by diamond operations. Material breakage characterisation methods has been used to determine the hardness or resistance to breakage of diamond host rock, ceramic diamond simulants and simulants embedded in the concrete blocks. This establishes a relationship between …
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The Biology of Spaeroma Terebrans in Lake Pontchartrain, Louisiana with Emphasis on Burrowing
… population may be parthenogenic and that wood or material hardness determines whether S. terebrans burrow when given a choice of substrates. The lake shoreline near the Bonnet Carre Spillway is retreating and the presence of S. terebrans contributes to shoreline erosion by weakening and destroying …
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Modeling abrasive wear of a 3D printer extruder drive mechanism
… lifetime of the shafts given a certain material hardness. The wear rate of the shafts is proportional to the hardness of the material and the square of the velocity of the extruded filament. Based on this model as well as experiments done with various materials, it is estimated that …
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Post-fire Mechanical Properties of Aluminum Alloys and Aluminum Welds
… Post-fire exposure is considered heating the material to a particular temperature then cooling the material back to room temperature. The research included evaluating parent materials as well as welded samples. Post-fire mechanical properties of parent materials were evaluated at temperatures …
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Retrogression-reaging and hot forming of AA7075
… retrogressing at 200 °C producing the hardest material after reaging by the PBC. The formability of AA7075-T6 during RRA forming was evaluated by tensile testing at 200 and 225 °C. Ductility of AA7075-T6 at RRA forming temperatures was double compared to those produced at room temperature. RRA …
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Sonocrystallization and sonofragmentation
… depended strongly on the strength of the crystal material, as described by its Vickers hardness or Young’s modulus. This is a mechanochemical extension of the Bell–Evans–Polanyi Principle or Hammond’s Postulate: i.e., activation energies for solid fracture correlate with the binding energies of …
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COMSOL finite-element analysis : residual stress measurement of representative 304L/308L weld in spent fuel storage containers
… and compressive stresses in the surrounding material. Hardness tests show trends similar to the hardening profiles that were created after the weld simulation. Additionally, the thermal model may offer insight in predicting the HAZ profiles in the weld. While the 2D model is simplified and …
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Failure of Martensitic Sharp Edges: A Micro-Mechanical Exploration for Design Guidelines
… steel and applied coatings to achieve high hardness and wear resistance. Yet they become practically unusable upon cutting much softer materials like cheese, potatoes, or human hair. Although this is an everyday observation, the underlying physical micro-mechanisms are poorly understood due …
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Changes in material characteristics of AISI 430 stainless steel plates subjected to repeated blast loading
… the mechanical properties and performance of the material. Therefore, understanding the effect of high strain rate loadings on the microstructural evolution and subsequent mechanical properties of metals and alloys is necessary for mechanical design. The main objective of this research was to …