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Assessment methods of mechanical properties of composite materials

Kamocka M., Mania R. J.

Mechanics and Mechanical Engineering

2017

Vol. 21, nr 4

1005--1018

The paper deals with a specific kind of imperfection in multilayered composite structures as thickness deviation. During manufacturing process the layers are laminated together with resin. Lack of accuracy or some errors during autoclaving process could contribute to thickness deviation when thin layer of resin remains between plies. This is particularly important in the case of hybrid laminates as Fibre Metal Laminates (FML). Therefore, the aim of this work is to determine the impact of thickness imperfection on the variation of effective mechanical properties of FML thin-walled panels. Two methods have been considered in the study: assumption of additional resin/matrix layer in a stacking sequence and a correction of fibre volume fraction in composite layers. A full 3-2 FML lay-up has been analyzed using Classical Lamination Plate Theory with connection to two micromechanical approaches: analytical (Rule of Mixture) and numerical (Finite Element Method). Results of calculations were verified by conducted experimental tests.