Unformatted text preview: The bigger the shear modulus the more rigid is the material since for the same change in horizontal distance (strain) you will need a bigger force (stress). This is why the shear modulus is sometimes called the modulus of rigidity. To a first approximation there is no change in volume in this deformation. The planes of atoms merely slide sideways over one another. That is why the area A (which determines the number of atomic bonds) is important in defining the stress and not just F . Note that in the diagram, since the block is not moving, there is a force F to the left on the bottom face which is not shown....
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 Spring '11
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 Shear Stress, Shear modulus, Pascals

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