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FAQnewred.gif (906 bytes)           

Torsion.

   Torsion is the stress which tends to distort by twisting. You produce a torsional force when you tighten a nut on a bolt. The aircraft engine exerts a torsional force on the crankshaft or turbine axis.
   All the members (or major portions) of an aircraft are subjected to one or more of these stresses. Sometimes a member has alternate stresses, such as compression one instant and tension the next. Some members can carry only one type of stress. Wire and cables, for example, normally carry only tension.(see animation or figure 1-2e)
<p><img src="images/pic1-2e.gif" alt="Type of stress: Torsion" align="bottom" width="304" height="130">

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