2. Modeling an axisymmetric section
2.1 Solid cylindrical section with constant diameter
2.1.1 Representation of distributed stiffness
It is taken into account by a massless torsion spring whose stiffness is calculated from the results of strength of materials, which assume that any straight section remains flat after deformation. As no external torque is applied during the section, the torsional moment M t in the section is constant, as is the unitary torsion angle θ. We have:
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Modeling an axisymmetric section
Modeling a straight section of constant cross-section and non-axisymmetric shape
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