In this paper, an upper bound approach is used to analyze the extrusion process of bimetallic rods through arbitrarily curved dies. Based on a spherical velocity field, internal, shearing and frictional power terms are calculated. The developed upper bound solution is used for calculating the extrusion force for two types of die shapes: a conical die as a linear die profile and a streamlined di...

Metal forming processes, compared with machining ones, reduce production steps and increase manufacturing speed in addition to saving raw material. In this paper, forming process of column of a steering mechanism is investigated by finite element analyses and experimental tests; and optimum die design parameters are found. Forming process parameters including die opening angle, bearing length, ...

the main purpose of this paper is to introduce and study new classes of soft closed sets like soft regular generalized b-closed sets in soft topological spaces (brie y soft rgb-closed set) moreover, soft rg-closed, soft gpr-closed, soft gb-closed, soft gsp-closed, soft g-closed, soft gb-closed, and soft sgb-closed sets in soft topological spaces are introduced in this paper and we investigat...

in a closed die forging process, it is impossible to form complex shapes in one stage, and thus it becomes necessary to use preform dies. in the present study, backward deformation method and fe simulation via abaqus software has been used in order to design preform die of the h-shaped parts. in the backward deformation method, the final shape of the part is considered as a starting point and u...

In this research, optimization process of axisymmetric extrusion dies is proposed. Plastic zone is analyzed using finite element method in the Eulerian system with flow formulation. The die profiles are defined by Bezier curves with six control points. Two effective functions are considered in this research; standard deviation of the strain rate and the rate of energy consumption during extrusi...

ZUSAMEN-FASSUNG:  Die oben angefuerte Erlaeuterung und Dis­kussion umfasst (I)- normale Entwicklung ein­zelner Hauptkomponente des menschlichen Immunmechanismus, ( 2) Faktoren, die moegli­cherweise fetalen Immunsystem aktivieren, (3) Faktoren, welche die Entwicklung des Immun­systems stoeren koennen.  REFERENCES 

ausser der traditionellen nutzung der geothermalen energie sind in jungster zeit neue erkenntnisse und projekte in ausarbeitung, die fur die zukunft ausserst wichtig sein konnen. bei einigen dieser projekte hat man bereits einige sehr positive ergebnisse erzielt. ausserdem wurde klar, das die ausgaben fur exploration,und expleitaion wirtscnaftlich ohneweiteres vsrtretbar sind,j•a sogar in hinbl...

Studies based on closed claims are very important in our efforts to improve patient safety. For patients, complications of anaesthesia can be compared with ‘friendly fire’. Harm is done unintentionally by somebody whose aim was to help. Patients may be seriously injured or even die due to a complication of anaesthesia, and such events may also lead to serious psychological consequences for the ...