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THE EFFECT OF FREQUENCY IN ENVIRONMENTAL FATIGUE TESTS
Author(s) -
Gabetta G.
Publication year - 1987
Publication title -
fatigue and fracture of engineering materials and structures
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.887
H-Index - 84
eISSN - 1460-2695
pISSN - 8756-758X
DOI - 10.1111/j.1460-2695.1987.tb00487.x
Subject(s) - superposition principle , materials science , paris' law , corrosion fatigue , structural engineering , growth rate , function (biology) , stress (linguistics) , mechanics , crack closure , strain rate , composite material , corrosion , fracture mechanics , mathematics , engineering , mathematical analysis , physics , geometry , linguistics , philosophy , evolutionary biology , biology
— The complex dependence of environmental fatigue crack growth rate on loading variables, has been studied for a pressure vessel steel in a pure water environment. Attention has been focused on the frequency effect, which has been interpreted by using a superposition model. With this approach, the maximum expected crack growth rate can be quantitatively estimated as a function of frequency; critical Δ K values for the onset of stress corrosion fatigue can be calculated as a function of crack tip strain rate, which depends on applied load, load rise time and crack length. The approach has been verified by a comparison with experimental data from two laboratories. The agreement of data with the prediction is quite good.