Yves Krahenbuhl - Academia.edu (original) (raw)

Yves Krahenbuhl

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Papers by Yves Krahenbuhl

Research paper thumbnail of Process for heating a metal alloy workpiece

Research paper thumbnail of Electrical Resistance of a Normal-Superconducting Boundary

Le Journal de Physique Colloques, 1978

Rdsum6.-Nous avons calculd la rdsistance de surface 1 partir de la thdorie microscopique pour des... more Rdsum6.-Nous avons calculd la rdsistance de surface 1 partir de la thdorie microscopique pour des supraconducteurs impurs et obtenu une ddpendance en tempgrature correspondant bien aux rdsultats expdrimentaux. Abstract.-We have computed the boundary resistance from microscopic theory for dirty superconductors and get good agreement with the experimental temperature-dependence.

Research paper thumbnail of Nonequilibrium theory of dirty, current-carrying superconductors: phase-slip oscillators in narrow filaments near T c

Journal of Low Temperature Physics, 1981

ABSTRACT

Research paper thumbnail of Theory of phase-slip processes in thin and dirty current-carrying superconducting wires: Deviations from local equilibrium

Zeitschrift f�r Physik B Condensed Matter, 1983

Oscillatory phase-slip solutions of a set of integrodifferential equations describing timedepende... more Oscillatory phase-slip solutions of a set of integrodifferential equations describing timedependent processes in dirty superconductors in the Ginzburg-Landau regime are found numerically very near T~. Deviations from local equilibrium improve the agreement with observed V-I curves.

Research paper thumbnail of Microscopic theory of the current-voltage relationship across a normal-superconducting interface

Journal of Low Temperature Physics, 1979

Research paper thumbnail of Modelling of Thermomechanical Effects during Direct Chill Casting of AA1201 Aluminium Alloy

Materials Science Forum, 1996

ABSTRACT

Research paper thumbnail of New methods for the fast simulations of the extrusion process of hot metals

Journal of Materials Processing Technology, 2009

Being able to find alternatives to the costly and time-consuming trial and error current practice... more Being able to find alternatives to the costly and time-consuming trial and error current practice in die design based on know-how acquired by practitioners throughout years is of primary importance in the aluminum extrusion industry. In this paper, two programs aimed at helping extruders in estimating the performance and feasibility of processes and simulating in details the flow of material in the press, are presented. Although they have been used so far for aluminum alloys, they could also be applied to other extrusion applications like that of other metals and polymers for instance. Together with a process simulator, which enables one to obtain a fast estimate of the extrusion process performances and computer-aided production of aluminum extrudates, a three-dimensional software dedicated to the design of dies with complicated shapes is also described.

Research paper thumbnail of Process for heating a metal alloy workpiece

Research paper thumbnail of Electrical Resistance of a Normal-Superconducting Boundary

Le Journal de Physique Colloques, 1978

Rdsum6.-Nous avons calculd la rdsistance de surface 1 partir de la thdorie microscopique pour des... more Rdsum6.-Nous avons calculd la rdsistance de surface 1 partir de la thdorie microscopique pour des supraconducteurs impurs et obtenu une ddpendance en tempgrature correspondant bien aux rdsultats expdrimentaux. Abstract.-We have computed the boundary resistance from microscopic theory for dirty superconductors and get good agreement with the experimental temperature-dependence.

Research paper thumbnail of Nonequilibrium theory of dirty, current-carrying superconductors: phase-slip oscillators in narrow filaments near T c

Journal of Low Temperature Physics, 1981

ABSTRACT

Research paper thumbnail of Theory of phase-slip processes in thin and dirty current-carrying superconducting wires: Deviations from local equilibrium

Zeitschrift f�r Physik B Condensed Matter, 1983

Oscillatory phase-slip solutions of a set of integrodifferential equations describing timedepende... more Oscillatory phase-slip solutions of a set of integrodifferential equations describing timedependent processes in dirty superconductors in the Ginzburg-Landau regime are found numerically very near T~. Deviations from local equilibrium improve the agreement with observed V-I curves.

Research paper thumbnail of Microscopic theory of the current-voltage relationship across a normal-superconducting interface

Journal of Low Temperature Physics, 1979

Research paper thumbnail of Modelling of Thermomechanical Effects during Direct Chill Casting of AA1201 Aluminium Alloy

Materials Science Forum, 1996

ABSTRACT

Research paper thumbnail of New methods for the fast simulations of the extrusion process of hot metals

Journal of Materials Processing Technology, 2009

Being able to find alternatives to the costly and time-consuming trial and error current practice... more Being able to find alternatives to the costly and time-consuming trial and error current practice in die design based on know-how acquired by practitioners throughout years is of primary importance in the aluminum extrusion industry. In this paper, two programs aimed at helping extruders in estimating the performance and feasibility of processes and simulating in details the flow of material in the press, are presented. Although they have been used so far for aluminum alloys, they could also be applied to other extrusion applications like that of other metals and polymers for instance. Together with a process simulator, which enables one to obtain a fast estimate of the extrusion process performances and computer-aided production of aluminum extrudates, a three-dimensional software dedicated to the design of dies with complicated shapes is also described.

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