Citation:
Mesogitis T, Skordos AA, Long AC. Non-crimp fabrics geometrical variability and its influence on composites cure. 16th European Conference on Composite Materials (ECCM16), 2014, 22-26 June 2014, Seville, Spain.
Abstract:
A framework is developed and implemented to characterize and model in plane fibre
misalignment in Non-Crimp fabrics (NCF). Image analysis based on fast Fourier Transform
and correlation analysis is used to characterise in plane fibre misalignment in a carbon fibre
±45º NCF. It is found that fibre misalignment is significant showing high anisotropic spatial
autocorrelation with the major direction of autocorrelation coinciding with the direction of
the non-structural stitching of the fabric. The spatial autocorrelation structure of the fabric is
modelled using an autoregressive two-dimensional stochastic process, the Ornstein-
Uhlenbeck (OU) sheet. The resulting stochastic field is simulated using the Cholesky
factorization, the spectral decomposition and the Karhunen-Loeve expansion (KLE). The
three discretization techniques are compared in terms of accuracy and efficiency.