Composite Bond Tolerance to Moisture Contents

Krystal Elise Wright

Abstract


Wooden propeller blades are used throughout the world in recreational aircraft and more currently in unmanned surveillance aircraft in operations in the Middle East. Wooden propeller are used in two forms; natural or laminated with a high modulus composite. Currently, recreational users are experiencing delamination of the wooden blades that are laminated with a high modulus composite. This thesis will concentrate on only propellers that are laminated in a high modulus composite. The aim of this thesis is to investigate the effect moisture content has on composite bond tolerance and whether the moisture content before lamination or the subsequent increase in moisture content through service contributes to delamination. In previous studies, the effect moisture content has on wood shrinkage and strength has been investigated, however, the effect of moisture content has on composite bond tolerance has not. The testing conducted will be in accordance with the American Society for Testing and Materials (ASTM). The outcome of this thesis hopes to educate recreational aircraft users in how to prevent delamination, hence making flying safer and less expensive.

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