On the thermal stresses in anisotropic porous cylinders
In this paper we study the deformation of right porous cylinders subjected to a prescribed thermal field. We assume that the cylinder is filled by an inhomogeneous anisotropic porous material. In the first part of the paper we study the problem of extension-bending-torsion, when the thermal field is independent of the axial coordinate and then we study the problem of extension-bending-torsion-flexure when the thermal field is considered linear in the axial coordinate. The considered problems are reduced to some generalized plane strain problems in the cross-section of the cylinder. Our analysis shows how the considered thermal fields influence the deformation of the porous cylinders.
Abstract Ellipsometric parameters of air-solution interfaces have been calculated for formamide mixtures with aliphatic alcohols. The results permitted the calculation of the so-called principal angles (ϕ p ) and the refractive indexes of the liquid in the surface zone and their comparison with bulk refractive indexes. Conclusions have been drawn from these data concerning the structure of the interface discussed and have been confronted with the surface entropy of these systems.