RECONSIDERATION OF MACROSCOPIC LOW CYCLE FATIGUE LAWS THROUGH OBSERVATION OF MICROSCOPIC FATIGUE PROCESS ON A MEDIUM CARBON STEEL.

Shoji Harada, Yukitaka Murakami, Yoshihiro Fukushima, Tatsuo Endo

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)

Abstract

In order to correlate macroscopic low-cycle fatigue laws such as the Manson-Coffin relation and Miner's rule with the actual microscopic fatigue process, cyclic strain-controlled low-cycle fatigue tests were conducted on a medium carbon steel under constant-, two-step-, and random-strain amplitude conditions. Through continual observation of the microscopic fatigue process of plain specimens and holed specimens with a very small hole (40 mu m diameter), it was found that the total fatigue life is mostly occupied by the microcrack propagation life. Both the Manson-Coffin relation and Miner's rule are derived using the microcrack propagation law. Then, background for the applicability of Miner's rule is discussed. The results of the random loading fatigue tests showed that microcrack propagation life can be predicted on the basis of the microcrack growth law in conjunction with the rain flow method for counting fatigue damage. Finally, the microcrack growth law-aided approach was applied to interpret anisotropy in fatigue strength of a thick forged steel plate.

Original languageEnglish
Title of host publicationASTM Special Technical Publication
EditorsH.D. Solomon, G.R. Halford, L.P. Kaisand, B.N. Leis
PublisherASTM
Pages1181-1198
Number of pages18
ISBN (Print)080310944X
Publication statusPublished - Dec 1 1987
Externally publishedYes
EventASTM Spec Tech Publ 942, Low Cycle Fatigue, a Symp - Bolton Landing, NY, USA
Duration: Sep 30 1987Sep 30 1987

Publication series

NameASTM Special Technical Publication

Other

OtherASTM Spec Tech Publ 942, Low Cycle Fatigue, a Symp
CityBolton Landing, NY, USA
Period9/30/879/30/87

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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  • Cite this

    Harada, S., Murakami, Y., Fukushima, Y., & Endo, T. (1987). RECONSIDERATION OF MACROSCOPIC LOW CYCLE FATIGUE LAWS THROUGH OBSERVATION OF MICROSCOPIC FATIGUE PROCESS ON A MEDIUM CARBON STEEL. In H. D. Solomon, G. R. Halford, L. P. Kaisand, & B. N. Leis (Eds.), ASTM Special Technical Publication (pp. 1181-1198). (ASTM Special Technical Publication). ASTM.