scholarly journals Quantitative Evaluation of Fatigue Limit of a Metal with an Arbitrary Crack under a Stress Controlled Condition(2nd Report, Steel under a Positive Mean Stress)

2004 ◽  
Vol 70 (692) ◽  
pp. 612-619 ◽  
Author(s):  
Tatsujiro MIYAZAKI ◽  
Hiroshi NOGUCHI ◽  
Masaharu KAGE
Keyword(s):  
Fatigue Limit ◽  
Quantitative Evaluation ◽  
Mean Stress

Effect of Roller-Working on Fatigue Strength Improvement of Notched Structural Stainless Steel

2006 ◽  
Vol 306-308 ◽  
pp. 151-156
Author(s):  
Priyo Tri Iswanto ◽  
Shinichi Nishida ◽  
Nobusuke Hattori ◽  
Yuji Kawakami
Keyword(s):  
Plastic Deformation ◽  
Stainless Steel ◽  
Fatigue Limit ◽  
Fatigue Behavior ◽  
Fatigue Tests ◽  
Mean Stress ◽  
Increase With Increase ◽  
Fatigue Strength Improvement ◽  
Rolled Specimen ◽  
Number Of Cycles

In order to study the effect of plastic deformation on fatigue behaviors of plastically deformed specimen, bending fatigue tests had been performed on notched deformed stainless steel specimens. Also pulsating fatigue tests were done on notched non-deformed specimens to evaluate the influence of mean stress on fatigue behavior of notched non-deformed specimens. The result showed that according to increase of deformation value, the fatigue limits of these specimens also significantly increase. Fatigue limit of rolled specimen does not linearly increase with increase in plastic deformation value. Based on fatigue limit diagram, the effect of compressive residual stress on fatigue limit improvement of stainless steel is higher than that of work-hardening. In case of non-deformed specimen, when the compressive mean stress increases, the fatigue limit and the number of cycles to failure increase. In case of tensile mean stress, this kind of mean stress decreases the fatigue limit.

The Effect of Mean Stress and Hardness on the Fatigue Limit of Small Defects

2002 ◽  
Vol 2002.2 (0) ◽  
pp. 415-416
Author(s):  
Takao KUDOU ◽  
Chu SAKAE ◽  
Masanobu KUBOTA ◽  
Yoshiyuki KONDO
Keyword(s):  
Fatigue Limit ◽  
Mean Stress

The Influence of Mean Stress on Fatigue Properties of ADI

2007 ◽  
Vol 567-568 ◽  
pp. 341-344
Author(s):  
Stanislav Vĕchet ◽  
Jan Kohout ◽  
Klára Hanzlíková ◽  
Vojtěch Hruby
Keyword(s):  
Fatigue Limit ◽  
Nodular Cast Iron ◽  
Isothermal Transformation ◽  
Fatigue Properties ◽  
Quantitative Phase Analysis ◽  
Mean Stress ◽  
Convex Shape ◽  
Limit Values ◽  
Static Tests ◽  
General Power

The paper presents the results of research focused on assessment of the influence of loading cycle asymmetry on fatigue limit values. For tests two heats of unalloyed nodular cast iron were used. Test bars made of keel blocks were heat treated in salt bathes (austenitization at 900 °C during 1 hour, isothermal transformation at 380 and 400 °C) and loaded at symmetrical, repeating and pulsating loading cycles at room temperature. Evaluation of fatigue properties was based on the determination of S-N curves in high-cycle region including the fatigue limit assessment for 107 cycles to fracture. Fatigue and static tests were completed by metallographic and quantitative phase analysis. Most important result obtained from the presented study is that the dependence of stress amplitude on mean stress cannot be approached by the linear relation but by general power law with exponent lower than 1 (i.e. the Haigh diagram has convex shape).

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