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THE IMPACT FATIGUE PROPERTIES OF PEARLITIC PLAIN CARBON STEELS
Author(s) -
JOHNSON ALAN A.,
KELLER DAVID J.
Publication year - 1981
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.1460-2695.1981.tb01125.x
Subject(s) - fatigue limit , materials science , carbon fibers , exponent , fracture (geology) , manganese , monotonic function , metallurgy , sulfur , impact energy , work (physics) , fatigue testing , composite material , forensic engineering , mathematics , composite number , thermodynamics , physics , engineering , mathematical analysis , linguistics , philosophy
— A literature search has revealed that the most extensive study of impact fatigue reported is still that of Stanton and Bairstow (1908) who were the first to work on this topic. Their results, which were on pearlitic plain carbon steels, have been reanalyzed in an attempt to deduce from them the effects of chemical composition on impact fatigue in this class of materials. The results show that when the number of impacts to failure, N f , is greater than about 10 3 , N f and the energy absorbed per impact, E i , are related by the equation: E i , = E o + E k N f −p , where E o appears to be the impact endurance limit. It is suggested that E k and p be named respectively the “impact fatigue parameter” and “impact fatigue exponent”. E k is independent of composition except that it is lower by a factor of about four for two materials which probably failed by an intercrystalline rather than transcrystalline fracture; p has a value of 0.6; and E o increases monotonically with silicon content but does not vary systematically with the carbon, manganese, sulphur or phorphorus contents. The significance of these results is discussed.