Criterion for the Prevention of Sleeve Fracture During Extrusion of Bimetal Rods

Abstract

In conjunction with the previous analysis on core fracture [1, 2], a criterion for prevention of sleeve fracture in extrusion of bimetal rods is developed. The sleeve fracture is likewise affected by a set of independent process parameters, namely the reduction in area, die angle, friction, interfacial bonding, relative size, and relative strength of the sleeve. It is shown that the usage of the present criterion for sleeve fracture and the criterion previously described for core fracture can provide an effective path to a successful extrusion operation for bimetal rods and wires.

An Analytical Approach to the Extrusion Pressure of Bimetallic Tube

“…Therefore, it is important to consider the characteristic of deformation in the process. In the extrusion of bimetallic rods, a fracture analysis has been carried out by Osakada et al [1] and Avitzur et al [2,3], providing an interesting background for the present subject. Alcaraz [4,5] applied the upper-bound approach to the extrusion of bimetallic tubes, in combination with the minimum-energy principle and the geometric compatibility of the deformation, to obtain a fracture condition during the hot extrusion of bimetallic tubes.…”

Extrusion analysis and workability prediction of three-layer composite hexagonal clad rods

“…A criterion for the prevention of core and sleeve fracture during extrusion of bimetal rods was presented by Avitzur et al [6,7]. Alcaraz and Sevillano [8] derived a criterion based on the geometric compatibility of the deformation of each material.…”

A variational upper-bound method for analysis of upset forging of rings

“…However, the approach for selecting general kinematically admissible velocity fields was investigated by Stepanskii [6] and Nagpal [7], respectively. When any of these aforementioned models is applied in the upper-bound analysis [8][9][10][11][12][13][14], solution is often determined by minimizing the total forming energy rate with respect to one or more parameters of an admissible function that defines the velocity field. Specifically, since the admissible function used has been mathematically expressed as an explicit function before the total forming energy rate is minimized, the velocity field to be determined can only satisfy its kinematic boundary conditions.…”