Abstract
We propose an energy approach to the evaluation of the residual service life of structural elements with cracks for the two-frequency loading mode of biaxial tension-compression. This approach is applied to a pipe of oil pipeline containing a crack on its inner surface. The pipe is regarded as an infinite plate with surface semicircular crack loaded by longitudinal tension-compression caused by the processes of heating and cooling of the pipe. The pipe is also squeezed by the soil and subjected to the action of internal pressure formed in the process of pumping of oil. The two-frequency variations of pressure in the pipe are caused by the turbulence of the flow of oil (high frequency), opening and closing of the gate valves, and the shutdowns of the pumps (low frequency). It is shown that if we neglect the longitudinal tension-compression of the pipe and the oscillations of pressure of oil in the evaluation of durability of the pipes of oil pipelines, then we can get strongly overestimated predictions of the residual service life.
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