Chapter 3 Torsion and shafts

3.1 Review of shear stress and strain

In order to study the theory of torsion it is necessary to review the fundamental properties of shear stress and strain. We looked at this subject in Chapter 1 but we present it again here in just a little more depth, since shear stress and strain result when shafts are subject to torsion.

If two equal and opposite parallel forces, not acting in the same straight line, act on a body, then that body is said to be loaded in shear (Figure 3.1). Shear stress, as you may already have seen, is defined in a similar

Figure 3.1 Shear strain and the angle of deformation

way to tensile ...

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