Experimental and theoretical analysis of the deformation of transversely isotropic plates in creep

This paper presents the results of calculations and experiments on the torsion of plates made of isotropic and transversely isotropic BT-20 and 1163T alloys with reduced resistance to creep strain in the direction perpendicular to the median surface. The numerical modeling results for plates of different thickness that belong to the class of rigid and flexible plates made with the use of the pure bending theory and the finite element method are compared. It is established that during the deformation of the plate of anisotropic material into an alternating saddle-shaped surface, the curvature values are smaller than in the case of a plate of a isotropic material. The calculation carried out ccording to the pure bending theory yields an upper estimate of the curvature ifference during the strain of the plates of transversely isotropic and sotropic materials.