D. I. Vichuzhanin , V. A. Khotinov, S. V. Smirnov
THE EFFECT OF THE STRESS STATE ON THE ULTIMATE PLASTICITY OF STEEL X80
DOI: 10.17804/2410-9908.2015.1.073-089 The dependence of ultimate plasticity on the triaxiality parameter and the Lode-Nadai coefficient is obtained for steel X80. The fracture locus allows the plasticity of the investigated materials to be evaluated for the whole range of the Lode-Nadai coefficient. Cylindrical specimen tension, bell-type specimen tension and compression and membrane extrusion are used for fracture locus calibration. The results can be used for plasticity resource estimation for steels under a complex stress-strain state in main pipelines subject to extreme loads.
Keywords: high-strength steel, fracture locus, plasticity resource, main pipeline. References:
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ВЛИЯНИЕ НАПРЯЖЕННОГО СОСТОЯНИЯ НА ПРЕДЕЛЬНУЮ ПЛАСТИЧНОСТЬ ТРУБНОЙ СТАЛИ ГРУППЫ ПРОЧНОСТИ Х80
Получена зависимость предельной пластичности стали группы прочности Х80 от показателя напряженного состояния и показателя Лоде – Надаи. Диаграмма позволяет оценивать пластичность исследуемых материалов во всем интервале изменения показателя Лоде – Надаи. Для построения диаграммы пластичности использовались испытания на растяжение гладких цилиндрических образцов и образцов с выточкой, растяжение и сжатие образцов типа «колокольчик», выдавливание мембран. Результаты исследований могут быть использованы для оценки ресурса пластичности сталей в условиях сложного напряженно-деформированного состояния при экстремальных нагрузках магистральных трубопроводов.
Ключевые слова: высокопрочные стали, диаграмма пластичности, ресурс пластичности, магистральный трубопровод Библиография:
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