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Stress & Strain

Assumptions and Limitations

Torsion is a type of loading caused by a twisting action or torque. Its effect on the member is the rotation of parallel cross-sections relative to each other. Several Assumptions have been made.

• Materials are considered to be homogeneous, isotropic and linear-elastic.
• Forces are evenly distributed over the cross-section and act through the centroid.
• Cross-sections are perpendicular to the longitudinal axis of the member.
• Plane sections before deformation remain plane after deformation.
• Stress and strain are linearly related and strains are small.