Fatigue Crack Growth Thresholds at Negative Stress Ratio for Ferritic Steels in ASME Code Section XI

被引：5

作者：

Hasegawa, Kunio ^{[1
]}

Strnadel, Bohumir ^{[1
]}

Usami, Saburo ^{[2
]}

Lacroix, Valery ^{[3
]}

机构：

[1] VSB Tech Univ Ostrava, Ctr Adv Innovat Technol, 17 Listopadu 15-2172, Ostrava 70833, Czech Republic

[2] Hitachi Ltd, Kokubu Cho, Hitachi, Ibaraki 3191292, Japan

[3] Tractebel Engn ENGIE, Bd Simon Bolivar 34-36, B-1000 Brussels, Belgium

来源：

JOURNAL OF PRESSURE VESSEL TECHNOLOGY-TRANSACTIONS OF THE ASME | 2019年 / 141卷 / 03期

关键词：

D O I：

10.1115/1.4043081

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

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 thresholds for ferritic steels in air and water environments. The threshold is given as a constant value under a 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 unconservative 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 a literature survey.

引用

页数：6

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