A creep analysis of a thick-walled anisotropic cylinder subject to combined internal and external pressures is presented. The elastic strains are also taken into account. By considering the creep rate as a function of stress multiplied by a function of time (time-hardening law), the fundamental equations for the creep of an orthotropic cylinder are obtained. These equations are solved for the particular case of planar anisotropy. A numerical example pertaining to the case of internal pressure is given and the results obtained for the anisotropic case are compared with those for the isotropic case.
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