The flexural modulus not always seems to increase with polyethylene-reinforcement, even when fibers are located at the tensile side.

The storage modulus values were compared and validated against the static flexural modulus values coupled with scanning electron microscopy analysis.

There was no significant change in flexural modulus for the UD composites, whilst the RM composites saw a decrease of -45%

Besides, fiber architecture (woven vs. unidirectional) seems to be more important than the type of fiber for flexural strength and flexural modulus.