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Thermo-fluid modeling of direct chill casting of metal alloys using an inverse finite element method
(Publ by Computational Mechanics Inc, 1992)
Direct chill (DC) casting is used extensively in the production of wrought nonferrous metals and alloys, particularly in the aluminum industry. For alloys, a semi-solid region known as the “mushy zone” and defined by the ...
Two-phase model for processing materials in semisolid state
(Affiliation: Worcester Polytechnic Inst, Worcester, United StatesCorrespondence Address: Alexandrou, Andreas N.Worcester Polytechnic Inst, Worcester, United States, 1998)
The importance of processing of metal and metal matrix composites in semisolid state is increasing quite rapidly due to the distinct advantages it offers over similar methods of near-net-shape making. In this investigation ...
The use of generalized eulerian–lagrangian formulations in composite materials processing
(1994)
The advantages of the Generalized Eulerian–Lagrangian (GEL) formulations in modeling and numerical solution of unsteady flow of fiber suspensions are discussed. This formulation offers the flexibility of selectively applying ...
Modeling of an electrohydraulic lithotripter with the KZK equation
(1999)
The acoustic pressure field of an electrohydraulic extracorporeal shock wave lithotripter is modeled with a nonlinear parabolic wave equation (the KZK equation). The model accounts for diffraction, nonlinearity, and ...
Flow development of Herschel-Bulkley fluids in a sudden three-dimensional square expansion
(1999)
The flow development of Herschel-Bulkley fluids in a sudden three-dimensional square expansion is studied numerically. The flow is modeled using the mixed-Galerkin finite element formulation to solve the conservation of ...
The effect of correlated and point defects on the vortex lattice melting transition in single-crystal YBa2Cu3O7-δ
(1994)
The vortex melting transition Tm in several untwinned and twinned crystals is measured resistively in fields up to 8T. A Lindemann criterion for vortex lattice melting is obtained in addition to a sharp hysteresis in the ...
Deposition and characterization of nitrogen containing stainless steel coatings prepared by reactive magnetron sputtering
(1996)
Nitrogen containing austenitic stainless steel coatings were deposited with nitrogen concentrations up to 14.1 at% using electron enhanced closed field unbalanced DC magnetron sputtering. The reactive gas flow was controlled ...
On the determination of yield surfaces in Herschel-Bulkley fluids
(1999)
Herschel-Bulkley fluids are materials that behave as rigid solids when the local stress τ is lower than a finite yield stress τ0, and flow as nonlinearly viscous fluids for τ > τ0. The flow domain then is characterized by ...
Testing models of the symmetry of the superconducting pairing state by low-temperature electron irradiation of an untwinned single crystal of YBa2Cu3O7-
(1994)
We have carried out in situ resistivity measurements in a high-voltage electron microscope to determine how the superconducting transition temperature Tc and the resistivity (T) change with low-temperature electron ...
Self-demodulation of amplitude- and frequency-modulated pulses in a thermoviscous fluid
(1993)
The self-demodulation of pulsed sound beams in a thermoviscous fluid is investigated experimentally and theoretically. Experiments were performed in glycerin at megahertz frequencies with amplitude- and frequency-modulated ...