The tangential stresses that arise in the material above the neutral layer is directly proportional to the transverse force, to the static moments square section under consideration, and is inversely proportional to the axial moment of inertia and its width.
Define a tangential stress in a selected element based on the fact that the axial moment of inertia for the rectangular cross section is
The glaciations cause significant MSL variations, water redistribution between the ocean and polar ice cap, and change of the Earth's axial moment of inertia
, which is connected with long periodical variations of the Earth's rotation, expressed as Length of Day (LOD) and Universal Time (UT1) oscillations.
assuming C to be constant, where C is the axial moment of inertia
of the Earth and its present value is ([C.
J represents the mass axial moment of inertia
for the cylinder in relation with geometrical and mechanical symmetrical axis (the two cylinders are considered perfect homogenous).