3.4 STRAIN ENERGY DUE TO SHEAR FORCE
A rectangular block of length l, height h and breadth b is being fixed at the bottom face DC and subjected to a shear force Pf(Figure 3.5).
Fig. 3.5 Rectangular block under shear force.
The face AB moves through a distance δl relative to the face DC as the shear force increased gradually from zero to its final value Pf Let q be the shear stress produced and ϕ be the shear strain.
| Shear stress, |  |
| Shear strain, | |
| ∴ | BB1 = δl = ϕ BC = hθ |
| Then, Shear force, |
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