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Journal of Composite Materials
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Numerical Analysis of the Dimensional Stability of Thermoplastic Composites Using a Thermoviscoelastic Approach

Byeong-Sam Kim

Nicolas Bernet

Paul Sunderland

Laboratoire de Technologie des Composites et Polyme`res (LTC), Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland

Jan-Anders Manson

Laboratoire de Technologie des Composites et Polyme`res (LTC), Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerlandjan-anders.manson{at}epfl.ch

The dimensional stability of V-shaped composite parts made from polyamide-12/carbon fibre (PA12/CF) commingled yarn has been studied. An anisotropic, thermoviscoelastic material model was implemented in a finite element solver to predict the internal stresses induced during the processing of the composite. Excellent correlation was found between predicted and experimentally measured stress profiles for compression-moulded parts. The stresses were related to the dimensional stability of the parts after demoulding and the effect of key processing parameters on dimensional stability was investigated.

Key Words: thermoviscoelasticity • finite element modelling • spring-forward • spring-back • internal stress • residual stress

Journal of Composite Materials, Vol. 36, No. 20, 2389-2403 (2002)
DOI: 10.1177/0021998302036020882
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M. B. Prime and M. R. Hill
Measurement of Fiber-scale Residual Stress Variation in a Metal-matrix Composite
Journal of Composite Materials, December 1, 2004; 38(23): 2079 - 2095.
[Abstract] [PDF]