:: Advanced Composites Letters on-line ABSTRACTS ::

Volume 14, Issue 1, 2005
Applicability range of the one-parameter ply plasticity model for prediction of the nonlinear response of laminates

E. Spârnins¹, J. Andersons¹, J. Varna²

¹Institute of Polymer Mechanics, University of Latvia
Aizkraukles iela 23, Riga LV-1006, Latvia
²Division of Polymer Engineering, Lulea University of Technology,
S-971 87 Lulea, Sweden

(Received 12/04; accepted 3/05)

Abstract
A one-parameter lamina plasticity model is applied to predict the nonlinear deformation of an E-glass / epoxy cross-ply composite laminate under quasi-static uniaxial tensile loading at different angles to the material orthotropy axes. It is shown that the laminate theory yields accurate results within the plastic strain range covered in unidirectional continuous-fibre reinforced composite tests that are used to determine the plasticity model parameters.
Keywords: plastic deformation, flow rule, glass/epoxy, cross-ply laminate.

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