Graphical Abstract Figure

Reference fatigue crack growth rates for R = 0 to ?5.

Graphical Abstract Figure

Reference fatigue crack growth rates for R = 0 to ?5.

Close modal

Abstract

Fatigue crack growth rates da/dN for stainless steels in air environment are provided by the ASME Code Section XI. The fatigue crack growth rates are given by da/dN = CF(ΔK)n, where CF is the fatigue crack growth rate coefficient, n is the fatigue crack growth rate exponent and ΔK is the stress intensity factor range. The coefficient CF contains a temperature parameter ST, and a scaling parameter SR, which is a function of the stress ratio R. When the stress ratio R is positive from 0 to 1, the parameter SR increases with the increasing ratio R, and da/dN increases with the increasing stress ratio R. When R is less than 0, SR = 1. Hence, fatigue crack growth rates under negative stress ratios are independent of stress ratios according to the ASME Code Section XI. However, from the results of literature survey, experimental data reveal that the fatigue crack growth rates decrease with decreasing R ratios below zero, i.e., negative stress ratios, when being expressed by da/dN = CF(ΔK)n, where ΔK is the full range of the stress intensity factor. The objective of this paper is to assess fatigue crack growth rates under such negative stress ratios for stainless steels in air environment. An equation determined from trends in experimental data surveyed in this study is proposed for negative R ratios to calculate the parameter SR for the ASME Code Section XI, Appendix Y.

References

1.
API,
2007
,
Fitness - for - Service
,
American Petroleum Institute
,
Washington, DC, No
.
API 579/ASME FFS
.
2.
British Standard Institution
,
2013
,
Guide to Method for Assessing the Acceptability of Flaws in Metallic Structures
, British Standard Institution, No. BS 7910.
3.
FKM Guideline,
2009
,
Fracture Mechanics Proof of Strength for Engineering Components
, 2nd ed.,
Forschungskuratorium Maschinenbau
, Frankfurt am Main, Germany.
4.
JSME
,
2018
,
Rules on Fitness-for-Service for Nuclear Power Plants
,
The Japan Society of Mechanical Engineers, Tokyo, Japan
(in Japanese).
5.
ASME
,
2023
,
Rules for Inservice Inspection of Nuclear Power Plant Components
,
ASME Boiler & Pressure Vessel Code Section XI
,
New York
.
6.
ASTM International
,
2015
,
Standard Test Method for Measurement of Fatigue Crack Growth Rates
, ASTM E 647,
ASTM International
,
Philadelphia, PA
.
7.
James
,
L. A.
, and
Jones
,
D. P.
,
1985
, “
Fatigue Crack Growth Correlations for Austenitic Stainless Steels in Air
,”
Predictive Capabilities in Environmentally Assisted Cracking
, ASME PVP, Miami, FL, Nov. 17, Vol.
99
, pp.
363
414
.https://www.osti.gov/biblio/6617626
8.
National Research Institute of Metals
,
1986
,
Data Sheets on Fatigue Crack Propagation Properties for Butt Welded Joints SUS304-HP (18Cr-8Ni) Hot Rolled Stainless Steel Plates, Effect of Stress Ratio
,
NRIM, Fatigue Data Sheet
, No. 54,
National Research Institute of Metals
,
Tokyo, Japan
.
9.
Pook
,
L.
,
1972
, “
Fatigue Crack Growth Data for Various Materials Deduced From the Fatigue Lives for Pre-Cracked Plates
,” No. ASTM STP 513, pp.
106
124
.10.1520/STP34117S
10.
The Society of Material Science,
1983
,
Data Book on Fatigue Crack Growth Rates of Metallic Materials
, Vol. 2, The Society of Material Science Japan, Kyoto, Japan.
11.
Kikukawa
,
K.
, Jono, M., Tanaka, K., and Takaya, M.,
1976
, “
Measurement of Fatigue Crack Propagation and Crack Closure at Low Stress Intensity Level by Unloading Elastic Compliance Method
,”
J. Soc. Mater. Sci., Jpn.
, 25(276), pp.
899
903
.10.2472/jsms.25.899
12.
Taylor
,
D.
,
1985
,
A Compendium of Fatigue Threshold and Growth Rates
,
Engineering Materials Advisory Service Ltd
,
Warlery, UK
.
13.
Pellereau
,
B.
, Currie, C., Mann, J., and Coult, B.,
2020
, “
Investigation Into Crack Closure Effects for Fatigue Crack Growth Under Negative R Conditions
,”
ASME
Paper No. PVP2020-21627.10.1115/PVP2020-21627
You do not currently have access to this content.