Stability of elastic cylindrical micropolar shells subject to combined loads

It follows from (1), (2) that the wryness tensor L is equal to zero (Nikitin & Zubov 1998, Pietraszkiewicz & Eremeyev 2009)

and expression for a stretch tensor Y has the form

where C= gradR= deformation gradient; grad = gradient in Lagrangian coordinates; and E= identity tensor.The prime denotes a derivative with respect to r.