Mesomechanics and hierarhical levels of fatigue crack growth in 25cr1mo1v steel

P. V. Yasniy, P. O. Maruschak, S. V. Panin, P. S. Lyubutin

Результат исследований: Материалы для журналаСтатьярецензирование

2 Цитирования (Scopus)

Аннотация

Within the concept of physical mesomechanics of materials the peculiarities of fatigue crack propagation in specimens of 25Cr1Mo1V steel with lateral notches were investigated under zero-to-tension stress cycles. The use of the television-optical strain measurement method at the mesolevel allowed a comprehensive description of the fatigue crack tip opening behaviour. For this purpose, the shear strain intensity parameter (SSI - γavg, γavg 1), calculated for fatigue cracks of various lengths, was used. It is established that within the FCGR range (fatigue crack growth rate) of 10-4÷3·10-3 mm/cycle the dependences "lg da/dN - lg γavg (lg γavg 1)" are well approximated by the linear function. Moreover, the SSI values increase with an increase in the crack length, which, on the whole, agrees satisfactorily with the results of fractographic research. The main regularities in the fatigue crack growth during the localization of plastic deformations at its tip are revealed and described numerically.

Язык оригиналаАнглийский
Страницы (с-по)169-175
Число страниц7
ЖурналInternational Journal of Terraspace Science and Engineering
Том3
Номер выпуска2
СостояниеОпубликовано - 2010

ASJC Scopus subject areas

  • Engineering(all)

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