Influence of long-term strain hold on creep-fatigue life of Mod. 9Cr$z.sbnd;1Mo steel Ogata, T. Journal of the Societv of Materials Science, Japan (1997) 46(1), 25?31

1998 ◽  
Vol 20 (3) ◽  
pp. 259
Keyword(s):  
Fatigue Life ◽  
Materials Science ◽  
Creep Fatigue ◽  
Strain Hold

Creep-Fatigue Strength of Sn-8Zn-3Bi Solder Under Multiaxial Loading

Materials ◽  
2005 ◽  
Author(s):  
Takaei Yamamoto ◽  
Takamoto Itoh ◽  
Masao Sakane ◽  
Hiroshi Sasaki ◽  
Kazuhiko Shuto ◽  
...  
Keyword(s):  
Fatigue Life ◽  
Fatigue Strength ◽  
Torsion Test ◽  
Multiaxial Loading ◽  
Strain Wave ◽  
Proportional Loading ◽  
Strain Waves ◽  
Creep Fatigue ◽  
Multiaxial Creep ◽  
Strain Hold

This paper describes the multiaxial creep-fatigue of Sn-8Zn-3Bi solder in proportional and non-proportional loadings. Push-pull and reversed torsion tests were carried in proportional test using fast-fast, slow-fast, fast-slow, slow-slow and strain-hold waves. Non-proportional tests were also carried out using box, step and circle strain waves. In proportional test, smallest creep-fatigue lives were observed in push-pull slow-fast test. Creep-fatigue lives in reversed torsion test were longer by a factor of 2 than those in push-pull test compared with the same strain wave. Non-proportional loading reduced the creep-fatigue life. Circle strain wave showed the smallest fatigue life in non-proportional loading. A non-proportional strain proposed by the authors correlated all the proportional and non-proportional fast-fast data within a factor of two scatter band.

Creep and Creep-Fatigue Strength Property of a Long-Term Used Boiler Weldment Parts of 2.25Cr-1Mo Steel

2002 ◽  
Author(s):  
Takashi Ogata
Keyword(s):  
Weld Joint ◽  
Hold Time ◽  
Prediction Method ◽  
Strain Range ◽  
Fatigue Properties ◽  
Lower Strain ◽  
Creep Fatigue ◽  
Failure Life ◽  
Strain Hold

The purpose of this study is to make clear effect of material degradation on creep and creep-fatigue properties of a weldment. Materials used in this study were a weldment of a boiler super header operated for about 200,000 hours (U weld joint) and a simulated as-received weldment (S weld joint). In the U weld joint, although creep cavities were not observed at all, significant coarsening of carbide precipitation and low dense dislocation structure were observed at all locations in the weldment compared with microstructure of the S weld joint. Creep rupture time of the U weld joint is shorter than that of the S weld joint at higher stress region, while the discrepancy of the rupture strength tends to disappear as stress level becomes lower. Strain controlled creep-fatigue tests with 1 hour and 10 hours strain hold time at the maximum tensile strain were performed at strain range of 0.3% and 0.5% on S and U weld joints. No difference of failure life between materials was observed. Reduction in failure life by introducing strain hold period becomes larger as decreasing strain range level indicating that creep-fatigue interaction is enhanced under lower strain range. Based on the nonlinear damage accumulation model, a simplified creep-fatigue life prediction method of weldments under creep-fatigue loading conditions was proposed. It was demonstrated that failure lives under the long-term creep-fatigue conditions were well predicted by the simplified prediction method.

A review of creep-fatigue life prediction methods: identification and extrapolation to long term and low strain cyclic loading

1984 ◽  
Vol 83 (3) ◽  
pp. 267-278 ◽  
Author(s):  
G. Cailletaud ◽  
D. Nouailhas ◽  
J. Grattier ◽  
C. Levaillant ◽  
M. Mottot ◽  
...  
Keyword(s):  
Fatigue Life ◽  
Cyclic Loading ◽  
Life Prediction ◽  
Fatigue Life Prediction ◽  
Prediction Methods ◽  
Creep Fatigue

scholarly journals Evaluation of Long Term Creep-Fatigue Life for Type 304 Stainless Steel.

1992 ◽  
Vol 41 (471) ◽  
pp. 1773-1778 ◽  
Author(s):  
Hirotsugu KAWASAKI ◽  
Fumiyoshi UENO ◽  
Kazumi AOTO ◽  
Masakazu ICHIMIYA ◽  
Yusaku WADA
Keyword(s):  
Stainless Steel ◽  
Fatigue Life ◽  
304 Stainless Steel ◽  
Creep Fatigue ◽  
Term Creep ◽  
Type 304 ◽  
Type 304 Stainless Steel
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