1999 / Solid Freeform Fabrication Proceedings
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Author Richard P. Chartoff (a), Jill S. Ullett (b), John W. Schultz (b) , (a) The University of Dayton, (b) Georgia Tech Research Institute
Source Solid Freeform Fabrication Proceedings, 1999, pp 443-452
Abstract In previous publications we showed that liquid crystal stereolithography resins can be cured in a magnetic field to yield polymers with anisotropic mechanical and physical properties. A modified stereolithography (SL) process developed as a part of this research provides the flexibility to change alignment directions from one layer to the next. This is akin to altering the fiber direction in continuous fiber reinforced composites. In traditional continuous-fiber composites, parts are often constructed of plies containing unidirectional fibers. When the fiber alignment varies from layer to layer throughout the structure, lamination theory developed for composite mechanics can be used effectively to model the characteristic mechanical and physical properties. Of particular interest is that by using such a model, layered polymeric parts with very low thermal expansion coefficients in the x-y plane can be designed. In this paper we demonstrate that composite lamination theory provides a basis for estimating the thermal expansion properties of liquid crystal polymer SL parts with aligned layers. (Auth abstract) [References: 14]
Solid Freeform Fabrication Proceedings can be obtained from: The Solid Freeform Fabrication Symposium
or contact:
The University of Texas at Austin
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Mechanical Engineering Dept.
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MC C2200
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512-471-3026; 512-471-7681 FX; Email: sffsymp@uts.cc.utexas.edu