Drawing and extrusion of single-phase and multilayered tubes through rotating conical dies is investigated within the framework of continuum plasticity. Large strain perfectly plastic J2 flow theory models constitutive behavior along with a radial-helical flow pattern. The governing system for a single-layer process is reduced to three coupled nonlinear ordinary differential equations. An approximate solution is developed for long and tapered working zones with low wall friction. That solution is used to simulate the field within each layer in composite tube forming. Exact relations are derived for the n-layered tube and it is shown that wall rotation can considerably reduce the required working loads.

Dedicated to Professor Dietmar Gross on the occasion of his 60th birthday

Issue Section:
Technical Papers
Keywords:
nonlinear differential equations, forming processes, drawing (mechanical), extrusion, rotation, plasticity, plastic flow, composite materials, multilayers
Topics:
Composite materials, Extruding, Friction, Rotation, Stress, Shear stress, Flow (Dynamics), Plastics forming, Plasticity
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Copyright © 2001
 by ASME
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