Thermoviscoelastic Analysis of Residual Stresses and Warpage in Composite Laminates

Author:

Wang T.-M.1,Daniel I.M.1,Gotro J.T.2

Affiliation:

1. Robert R. McCormick School of Engineering and Applied Science Northwestern University Evanston, IL 60208

2. IBM Corporation Endicott, NY 13760

Abstract

Linear thermoviscoelastic lamination theory was used to determine resid ual stresses and warpage in multidirectional woven-glass/epoxy laminates. The single "unidirectional" layer of the material was characterized by means of an accelerated proce dure. The material was assumed to be thermorheologically simple and the time-tempera ture superposition principle (TTSP) was used to obtain "master curves" for the viscoelastic properties. A numerical procedure was developed for determination of residual stresses and warp age, taking into consideration the irreversible polymerization shrinkage and boundary conditions during curing. Warpage was measured experimentally for [06/906] and [011/30] laminates using the projection moire method and results were in good agreement with the analytical prediction.

Publisher

SAGE Publications

Subject

Materials Chemistry,Mechanical Engineering,Mechanics of Materials,Ceramics and Composites

Reference8 articles.

1. Daniel, I.M., T.M. Wang, D. Karalekas and J.T. Gotro. 1989. "Determination of Chemical Cure Shrinkage in Woven-Glass/Epoxy Laminates," Proc. of ANTEC 1989 Conf., Soc. of Plastics Engineers, New York, NY, May, 1989, Technical Papers, Vol. XXXV, pp. 632-634.

2. Determination of Chemical Cure Shrinkage in Composite Laminates

3. Thermomechanical Behavior of Multilayer Structures in Microelectronics

4. The viscoelastic behavior of the principal compliance matrix of a unidirectional graphite/epoxy composite

5. On the effects of environmental conditioning on residual stresses in composite laminates

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