Composite material is less flexible than metal. Not more so.
Generalizations should never, ever, ever be made about composites. Given the countless possible variations in fiber orientation and layup, not to mention the prepreg variables and differing construction methods, the above statement is absolutely, 100% impossible to prove or disprove.
Composites can be stiffer than metal. They can be more flexible than metal. They can be stiffer in one direction
than metal. They can be more flexible torsionally
than metal. You get my drift.
Saying composite material acts in a certain way relative to another material is kind of like saying oil paints are greener than watercolors. You can make
oil paint as green as you'd like by altering the pigment, etc.
P.S. - This is in no
way intended to knock our esteemed Gigneil. I just see this sort of statement frequently and want to clear things up a bit.