Cyclic creep of pipes under block loading by internal pressure

Keywords

cyclic creep (ratcheting), deformation of pipes by internal pressure, circum¬ferential and axial deformations, block diagram of cyclic loads.

Cite as

Adamchuk M. P., Borodii M. V., Stryzhalo V. O., Yaskovets Z. S., and Skakun S. A. Cyclic creep of pipes under block loading by internal pressure. Physico­chemical Mechanics of Materials. 2022. 58(2), 087-094.

Abstract

Specific features of deformation of a straight segment of a Du 200 pipeline made of steel 20 under internal pressure cyclic loading have been experimentally investigated. The test was carried out on a pneumohydraulic stand under conditions close to the plane-stress state with registration of circumferential and axial elastic-plastic deformations. The inves-tigation program provides a block cyclic load of a pipe with a varying amplitude, but with a constant average stress in the cycle. Strain diagrams are obtained due to cyclic creep (ratcheting) of the pipe in the circumferential and axial directions after 100 cycles in each of the three load blocks. It is shown that an increase in the load amplitude (compared to that applied in the previous block) enhances the effect of cyclic creep, and a return to the lower load level neutralizes this effect.

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