Showing papers by "C.J. Van Tyne published in 2007"

TL;DR: In this paper, the authors investigated the hydroformability of an extruded aluminum alloy at elevated temperatures and compared the results with experimental data using a high temperature tribometer (pin-on-disk) allowing the measurement of the friction coefficient for the aluminum alloys at several temperatures.

TL;DR: In this paper, an adaptable die design method is used to determine streamlined die shapes, which will minimize the pressure required for the extrusion process by using a Legendre polynomial series for representation of the die surface.

TL;DR: In this paper, six kinematically admissible velocity fields are developed for use in upper bound models for axisymmetric extrusion through various dies, including adaptable dies.

TL;DR: In this article, a flat-die tribometer and a bending-under-tension tribometer were used to investigate the frictional behavior of a single interstitial-free steel with four different distributions of intermetallic phases in the coating as well as steels from commercial producers.

TL;DR: In this paper, six kinematically admissible velocity fields, along with the power terms, were developed for use in upper bound models for arbitrarily shaped dies for axisymmetric extrusion.

TL;DR: In this article, a double optimization process is used to determine the values for the flexible variables in the velocity field and secondly to decide the die shape that best meets the given criteria.

TL;DR: In this article, the results of extrusion through dies designed by the adaptable die design method, for a model with the deformation zone extended into the bearing region, were compared to a model without such an extension.