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Indexed by:期刊论文

Date of Publication:2016-01-15

Journal:MATERIALS & DESIGN

Included Journals:SCIE、EI

Volume:90

Page Number:248-255

ISSN No.:0261-3069

Key Words:FV520B stainless steel; High-cycle fatigue; Intrinsic dissipation; Microstructure motion

Abstract:Systemic fatigue tests were carried out to research the high-cycle fatigue behavior of FV520B stainless steel based on the theory and the calculation model of intrinsic dissipation. Experimental results demonstrate that the method, utilizing intrinsic dissipation as the fatigue damage indicator, can rapidly evaluate the high-cycle fatigue behavior of FV520B stainless steel with a limited number of test specimens. It is shown that the intrinsic dissipation increases with the applied stress amplitude and there is a change point of the increases rate on the curve of intrinsic dissipation versus stress amplitude. The change point reveals a change of the generation mechanism of intrinsic dissipation, and the corresponding stress amplitude is precisely the fatigue limit. For the same stress amplitude, the rate of intrinsic dissipation remains substantially constant during the whole fatigue life. Fatigue failure occurs once the part of intrinsic dissipation associated with fatigue damage accumulates to a threshold value, which is a material constant independent of loading history. (C) 2015 Elsevier Ltd. All rights reserved.