On the estimation of the cyclic plastic strain energy of dual-phase steels

Mediratta, S. R. ; Ramaswamy, V. ; Rama Rao, P. (1988) On the estimation of the cyclic plastic strain energy of dual-phase steels International Journal of Fatigue, 10 (1). pp. 13-19. ISSN 0142-1123

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Official URL: http://linkinghub.elsevier.com/retrieve/pii/014211...

Related URL: http://dx.doi.org/10.1016/0142-1123(88)90016-3


Low cycle fatigue tests were conducted on dual-phase steels containing a variety of ferrite-martensite microstructures. With the exception of the one which had a low volume per cent martensite (1.5%), these steels displayed deviation from the Masing behaviour: the extent of this deviation, interestingly, increased with the increase in cyclic strain hardening exponent. Consequently, a significant disparity was observed between the values of the average plastic strain energy per cycle (ΔW̅P) calculated with the equations of Morrow, Quesnel and Kliman and Bily, based on the Masing material description, and those actually measured. It is shown that the equation developed by Lefebvre and Ellyin for non-Masing materials provides energy values comparable to the measured ones. Further, an empirical modification to Morrow's equation has been suggested, which yields a more reliable estimate of ΔW̅P of the dual-phase steel regardless of the extent of deviation from the Masing behaviour.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:Low Cycle Fatigue; Plastic Strain Energy; Hysteretic Energy; Dual-phase Steel; Ferrite-martensite Microstructure
ID Code:41842
Deposited On:31 May 2011 10:49
Last Modified:31 May 2011 10:49

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