Geomechanics and Ground Control · Geomechanics · 1 mark · Multiple choice
A shear stress acts tangentially on the top of a block of width $w$ and height $h$, producing a small top displacement $\Delta w$ as shown. Find the engineering shear strain.
Shear strain measures the change in angle between initially perpendicular material lines. For a small deformation, γ = tanγ ≈ top displacement/block height = Δw/h. Thus B. The block width is not the separation between the top and fixed bottom surfaces.
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