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Facility layout using layout modulesHuang, Heng 15 October 2003 (has links)
No description available.
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Effects of torso flexion on fatigue failure of the human lumbosacral spineGallagher, Sean January 2003 (has links)
No description available.
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Mechanics and mechanisms of ultrasonic metal weldingde Vries, Edgar 05 March 2004 (has links)
No description available.
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Ejection forces and static friction coefficients for rapid tooled injection mold insertsKinsella, Mary E. 29 September 2004 (has links)
No description available.
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Equilibrium temperature analysis and fill pattern reasoning for die casting processWang, Dongtao 12 October 2004 (has links)
No description available.
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566 |
Analyses and application of piezoelectric actuator in decoupled vibratory feedingHu, Zhaoli 22 November 2005 (has links)
No description available.
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Team cognition in intelligence analysis trainingTrent, Stoney 30 August 2007 (has links)
No description available.
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A study of casting distortion and residual stresses in die castingGarza-Delgado, Abelardo January 2007 (has links)
No description available.
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569 |
Bayesian and Semi-Bayesian regression applied to manufacturing wooden productsTseng, Shih-Hsien 08 January 2008 (has links)
No description available.
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Numerical modeling and experimental investigation of laser-assisted machining of silicon nitride ceramicsShen, Xinwei January 1900 (has links)
Doctor of Philosophy / Department of Industrial & Manufacturing Systems Engineering / Shuting Lei / Laser-assisted machining (LAM) is a promising non-conventional machining technique for advanced ceramics. However, the fundamental machining mechanism which governs the LAM process is not well understood so far. Hence, the main objective of this study is to explore the machining mechanism and provide guidance for future LAM operations. In this study, laser-assisted milling (LAMill) of silicon nitride ceramics is focused.
Experimental experience reveals that workpiece temperature in LAM of silicon nitride ceramics determines the surface quality of the machined workpiece. Thus, in order to know the thermal features of the workpiece in LAM, the laser-silicon nitride interaction mechanism is investigated via heating experiments. The trends of temperature affected by the key parameters (laser power, laser beam diameter, feed rate, and preheat time) are obtained through a parametric study. Experimental results show that high operating temperature leads to low cutting force, good surface finish, small edge chipping, and low residual stress. The temperature range for brittle-to-ductile transition should be avoided due to the rapid increase of fracture toughness.
In order to know the temperature distribution at the cutting zone in the workpiece, a transient three-dimensional thermal model is developed using finite element analysis (FEA) and validated through experiments. Heat generation associated with machining is considered and demonstrated to have little impact on LAM. The model indicates that laser power is one critical parameter for successful operation of LAM. Feed and cutting speed can indirectly affect the operating temperatures.
Furthermore, a machining model is established with the distinct element method (or discrete element method, DEM) to simulate the dynamic process of LAM. In the microstructural modeling of a β-type silicon nitride ceramic, clusters are used to simulate the rod-like grains of the silicon nitride ceramic and parallel bonds act as the intergranular glass phase between grains. The resulting temperature-dependent synthetic materials for LAM are calibrated through the numerical compression, bending and fracture toughness tests. The machining model is also validated through experiments in terms of cutting forces, chip size and depth of subsurface damage.
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