Abstract
A determination is made of the load-carrying capacity of an oil pipeline with defects with allowance for the changes in the radius, thickness, and ductility properties of the constituent steels and the biaxial nature of the loading. The use of a fracture criterion connected with loss of plastic stability by the pipe is substantiated. This criterion is refined with consideration of the biaxial character of the load and the parameters of a longitudinal crack in the pipe. New analytical relations are derived for engineering calculations of the ultimate strength of thin-walled cylindrical pressure vessels, and a coefficient expressing the effect of the dimensions of the surface crack is refined for these formulas, Examples are presented to illustrate the calculation of the force exerted by a hydraulic expander in the last forming operation for large-diameter pipe. Also, practical recommendations are given on determining hydraulic testing regimes, load-carrying capacity, working pressure for oil pipelines.
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Translated from Problemy Prochnosti, No. 12, pp. 51–59, December, 1993.
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Ost-semin, A.A., Zavarukhin, V.Y. Strength of an oil pipeline with surface defects. Strength Mater 25, 898–905 (1993). https://doi.org/10.1007/BF00774637
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DOI: https://doi.org/10.1007/BF00774637