Die-less Forming of Thermoplastic-Matrix Continuous Fiber Composite Materials—Process and Demonstration

[+] Author and Article Information
K. Ramani, A. K. Miller, M. R. Cutkosky

Stanford University, Stanford, CA 94305

J. Eng. Ind 117(4), 501-507 (Nov 01, 1995) (7 pages) doi:10.1115/1.2803527 History: Received May 01, 1992; Revised April 01, 1994; Online January 17, 2008


Conventionally, large components made of thermoplastic matrices and continuous fibers are manufactured in autoclaves using dies. As the applications of composite materials increase, there is a need to reduce costs and increase manufacturing flexibility. This need has led to the development of a new concept called “die-less forming”. The concept of “kinematically admissible bending” is central to the concept of die-less forming. The concepts behind die-less forming have been tested in preliminary experiments on a two-roller demonstration machine. Induction heating was used to locally heat the composite as it moved into the forming zone, where it was bent using a specially designed cluster roller. Induction heating combined with a variable velocity profile was successful in establishing a uniform heating profile. Experiments were conducted for multidirectional APC-2 carbon/PEEK fiber composites and the composite bending behavior was explained using energy methods.

Copyright © 1995 by The American Society of Mechanical Engineers
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