Short-Term Creep of St3 Steel Under Low-Frequency Cyclic Loading

Creep constitutive equations have been derived for the materials that exhibit the properties of orthotropy (transversal isotropy) and transient creep under cyclic loading. A low-frequency case is considered. The paper provides results of experimental studies of the short-term creep of St3 steel under static and stepwise cyclic loading at room temperature. The results of calculations by the proposed constitutive equations are compared with the experimental data. A good agreement has been found for the number of cycles above 4 or 5, which demonstrates the applicability of the proposed constitutive equation to the low-frequency creep calculations for sheet materials.