The torsion of a non-homogeneous stratum with a hyperbolic variation of shear modulus

An exact formulation of the governing dual integral equations for the torsion of a non-homogeneous stratum due to a rigid circular body at its free surface is presented. The stratum varies in shear modulus according to the hyperbolic variation in a contemporary work 1]. It is shown that the unknown static stress distribution under the rigid body is governed by modified Bessel function of the first kind. By comparing the governing functions in the dual integral equations for five cases of elastic media: homogeneous half-space, and stratum, linearly non-homogeneous half-space and stratum and, finally, the present non-homogeneous stratum with hyperbolic variation, it is established that the surface shear modulus is the dominant parameter in the assessment of the stress and displacement fields in a non-homogeneous stratum where lateral variation of elastic properties is negligible.