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research-article

FATIGUE CRACK GROWTH THRESHOLDS AT NEGATIVE STRESS RATIO FOR FERRITIC STEELS IN ASME CODE SECTION XI

[+] Author and Article Information
Kunio Hasegawa

Center of Advanced Innovation Technologies, VSB-Technical University of Ostrava, 17. Listopadu 15/2172, Ostrava-Poruba, 708 33, Czech Republic
kunioh@kzh.biglobe.ne.jp

Bohumir Strnadel

Center of Advanced Innovation Technologies, VSB-Technical University of Ostrava, 17. Listopadu 15/2172, Ostrava-Poruba, 708 33, Czech Republic
Bohumir.strnadel@vsb.cz

Saburo Usami

Hitachi, Ltd., Kokubu-cho, Hitachi-shi, Ibaraki-ken, 319-1292, Japan
usami@apricot.ocn.ne.jp

Valery Lacroix

Tractebel Engineering (ENGIE), Bd. Simon Bolivar 34-36, Brussels B-1000, Belgium
valery.lacroix@tractebel.engie.com

1Corresponding author.

ASME doi:10.1115/1.4043081 History: Received January 01, 2019; Revised February 19, 2019

Abstract

Thresholds of fatigue crack growth rates are important characteristics for fatigue crack growth assessment for the integrity of structural components. ASME Code Section XI provides fatigue crack growth threshold for ferritic steels in air and water environments. The threshold is given as a constant value under negative stress ratio. However, the thresholds are not clearly defined in the range of negative stress ratios. The definition seems to be maximum stress intensity factors. Besides, the thresholds expressed by the maximum stress intensity factors decrease with decreasing stress ratios. This means that the thresholds under negative stress ratios become un-conservative assessments. The objective of this paper is to discuss the definition of fatigue crack growth threshold and to propose the threshold equation for the ASME Code Section XI, based on experimental data obtained from literature survey.

Copyright (c) 2019 by ASME
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