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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.
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