5003 Lectures - Faculty of Engineering and Applied Science

E5003 - Ship Structures I 201
© C.G. Daley
Local structural torsion can be found throughout
ships. Bending of a frame can result in a torsion in
a supporting frame.
Torsion Review
Consider a solid circular shaft subject to a
torsional moment. The longitudinal axis of the
cylinder x axis. A torsion is a moment about the x
axis. In such a case we get an ideal torsional
response. Every circular cross section remains
plane and remains centered on the x axis. Each
plane rotates slightly in comparison to its
neighboring cross sections. Assume that two
planes (1 and 2) are separated by a distance dx. In
comparison to their original orientations, the
planes are rotated