Abstract: The process of extrusion through a chamber is analyzed. Kinematically admissible velocity fields are utilized to obtain a lower upper-bound solution for the extrusion stress. Assumptions are as ...

Abstract: The process of hydrostatic extrusion, where the liquid-surrounded billet is pushed through a die by means of liquid pressure instead of a ram, is analyzed. Expressions are provided giving the ...

Abstract: A velocity field is considered to describe flow through conical dies. The expected distorted grid pattern is studied. Strain and strain rate fields are analyzed. Effective strain and effective ...

Abstract: In the operations of tube forming, the purpose is to change the diameter of the tube. To achieve this, the tube is drawn through a conical die (tube sinking) to decrease its diameter, or ...

Abstract: An upper-bound solution for energy expended to cause the flow of strain-hardening material through conical converging dies is presented. A linear strain-hardening coefficient is considered. The ...

Abstract: In a previous paper criteria for maximum possible reduction were developed. A simple procedure for the experimental determination of the coefficient of friction was introduced. In this paper a ...

Abstract: The central burst defect, also called chevroning, in the extruded or drawn product is analyzed. A criterion for the unique conditions that promote this defect has been derived. Measures to ...