On the Thickness Dependence of ILTS in Curved Composite Laminates
A test campaign has been carried out to determine the interlaminar tensile strength (ILTS) in AS4/8552 composite laminates with different thicknesses, following AITM 1-0069 and ASTM D6415/D6415M-06a standards. Results show that L-shaped samples with low thicknesses present lower values of the ILTS. Numerical finite element (FE) models of the samples have been carried out and the results of the numerical analyses have been compared with the experimental measurements, showing that a loss of stiffness has taken place in the samples. Optical inspection of the samples has shown up a significant misalignment of the fibers in the curved part that justifies the loss of stiffness in all samples and the loss of strength in the thinner samples.
Luis Rodríguez-Tembleque, Jaime Domínguez and Ferri M.H. Aliabadi
P. L. Zumaquero et al., "On the Thickness Dependence of ILTS in Curved Composite Laminates", Key Engineering Materials, Vol. 774, pp. 523-528, 2018