Stress Distributions Over Wire Cross-Section

This chapter examines the stress distribution across the wire cross-section of helical springs. For simplicity, the pitch of the helical spring is neglected and the traditional representation of a coil as an incomplete torus is used. This model generalizes StVenant's torsion problem of an elliptical straight rod, considering the curvature of the rod. The closed-form solution for the torsion problem of an incomplete torus is discussed. This chapter is the next section of the first part, which studies the springs from the point of view of design.