Table of Contents

Materials and Structure




A two-ply laminate that is in a planar stress-free condition at room temperature will distort as shown if its temperature is changed.

Many polymeric-matrix composites are cured at temperatures of about 200 C and will be stress free in the as-cured state. When these samples are removed from the autoclave and cooled to room temperature they will also distort in the manner shown.
This behavior must be taken into consideration when designing components for airfoils, etc.. Symmetric laminate construction reduces these effects.

From: Hull, "An Introduction to Composite Materials," Cambridge (1992)