ABSTRACT
Beams and rods often fail in shear due to excessive twisting or torsion. This frequently occurs with overly tightened bolt=nut systems, with torsion bars, drive shafts, and beams with off-center loads. In this chapter, we review the fundamentals of the torsion of rods with the corresponding stress and displacement analyses. Since most rods subjected to torsion have circular cross sections, we begin our discussion with round bars. After that, we briefly consider bars with noncircular cross sections and hollow tubes.
