scholarly journals Surface small crack growth behavior of SUS 304 stainless steel in low cycle fatigue under creep-fatigue condition at elevated temperature.

1987 ◽  
Vol 36 (410) ◽  
pp. 1232-1238
Author(s):  
Masakazu OKAZAKI ◽  
Tomohiro ENDOH ◽  
Toshio YADA ◽  
Takashi KOIZUMI
Keyword(s):  
Stainless Steel ◽  
Elevated Temperature ◽  
Crack Growth ◽  
Low Cycle Fatigue ◽  
Growth Behavior ◽  
304 Stainless Steel ◽  
Crack Growth Behavior ◽  
Cycle Fatigue ◽  
Creep Fatigue ◽  
Small Crack Growth

High Temperature Crack Growth Behavior of 304 Stainless Steel under Creep and Fatigue Loading

2005 ◽  
Vol 297-300 ◽  
pp. 452-457
Author(s):  
Y.M. Baik ◽  
K.S. Kim
Keyword(s):  
Stainless Steel ◽  
Crack Growth ◽  
Growth Rates ◽  
Hold Time ◽  
Fatigue Loading ◽  
Growth Behavior ◽  
304 Stainless Steel ◽  
Crack Growth Behavior ◽  
Creep Fatigue ◽  
Crack Growth Rates

The crack growth behavior in a 304 stainless steel has been investigated at 538°C in air environment. Compact tension specimens were subjected to fatigue, creep and creep-fatigue loading. The combined effects on crack growth rates of load level and hold time have been examined. Stress intensity factors are found to correlate crack growth rates reasonably well for fatigue crack growth. Creep crack growth rates are found to correlate with stress intensity factor and C*(t). Crack growth rates under hold time cycles are successfully correlated with C*(t)avg under various load levels and hold times. Crack growth under creep-fatigue loading has been simulated by elastic-plastic-steady state creep finite element analyses. The results of analysis show that fatigue loading interrupts stress relaxation around the crack tip during hold time and causes stress reinstatement, thereby giving rise to accelerated crack growth compared with crack growth under static loading. Analysis of hold time crack growth based on the cyclic stress-strain response yields crack closure during unloading, and creep deformation during hold time tends to lower the closure load.

Crack Growth Behavior of Full-Scale Turbine Attachment Under Combined High and Low Cycle Fatigue

2019 ◽  
Vol 141 (9) ◽  
Author(s):  
Dianyin Hu ◽  
Lin Yan ◽  
Ye Gao ◽  
Jianxing Mao ◽  
Rongqiao Wang
Keyword(s):  
Elevated Temperature ◽  
Crack Growth ◽  
Crack Closure ◽  
Low Cycle Fatigue ◽  
Growth Behavior ◽  
Full Scale ◽  
Image Correlation ◽  
Crack Growth Behavior ◽  
Cycle Fatigue ◽  
Closure Effect

Turbine attachments in the aero-engine are generally subjected to combined high and low cycle fatigue (CCF) loadings, i.e., low cycle fatigue (LCF) loading due to centrifugal and thermal loading stresses superimposed to the aerodynamically induced high cycle fatigue (HCF) loading. The primary focus of this study is to predict the crack growth life for the actual full-scale turbine attachment through experimentally examining the crack growth behavior under CCF loading at elevated temperature. The crack closure effect was first investigated by using the corner-notched (CN) specimen cut from the turbine attachment since the stress state of CN specimen is more similar to turbine attachment than compact tension (CT) specimen. Employing digital image correlation (DIC) technique, the level of crack closure of CN specimen was clarified under different stress ratios (R) for LCF loading. Afterward, a CCF crack growth model for the full-scale turbine attachment was proposed, which takes the crack closure effect, time-independent crack increment, and transient vibrational analysis into account. In order to verify the proposed method, a Ferris wheel system was established to conduct CCF test on the full-scale turbine attachment at elevated temperature. This study provides an effective methodology to predict the fatigue crack growth (FCG) life of full-scale turbine attachment under CCF loading.

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