Thermographic investigation of the fatigue behavior of reactor pressure vessel steels

Yang, Bing; Liaw, Peter K.; Wang, H.; Jiang, Liang; Huang, J. Y.; Kuo, R.C.; Huang, Jiunn-Yuan

doi:10.1016/s0921-5093(00)01910-9

Cited by 103 publications

(84 citation statements)

References 9 publications

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“…The rise of the mean temperature during fatigue tests is due to the plastic deformation of the material. The oscillation of the temperature around the mean value is caused by the thermoleastic effect (Yang et al 2001;Meneghetti 2007). …”

Section: Methodsmentioning

confidence: 99%

On the thermodynamic entropy of fatigue fracture

2009

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Entropy production during the fatigue process can serve as a measure of degradation. We postulate that the thermodynamic entropy of metals undergoing repeated cyclic load reaching the point of fracture is a constant, independent of geometry, load and frequency. That is, the necessary and sufficient condition for the final fracture of a metal undergoing fatigue load corresponds to a constant irreversible entropy gain. To examine validity, we present the results of an extensive set of both experimental tests and analytical predictions that involve bending, torsion and tension-compression of aluminium 6061-T6 and stainless steel 304 specimens. The concept of tallying up the entropy generation has application in determining the fatigue life of components undergoing cyclic bending, torsion and tension-compression.

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Section: Methodsmentioning

confidence: 99%

On the thermodynamic entropy of fatigue fracture

2009

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“…Numerical simulation is a very good approach for this purpose. Jiang et al (10), (11) and Yang et al (12), (13) analyzed the temperature evolution during cyclic loading of Ultimet alloy by one-dimensional numerical simulation for some early cycles. However, to the authors' knowledge, there is no other researcher focuses on numerical simulation.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation on Rapid Evaluation of Fatigue Limit through Temperature Evolution

Lý

Inoue

Irie

2011

JMMP

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This study is conducted to verify the technique of fatigue limit evaluation through numerical simulation. Temperature evolution of a notched stainless steel specimen subjected to cyclic loading is simulated by elasto-plastic finite element analysis. Both amplitude of second harmonic and mean temperature rise are obtained from the temperature evolution. It has been shown that the fatigue limits evaluated from the second harmonic amplitude and from the mean temperature rise agree fairly well with the fatigue limits obtained by thermography experiment and Wöhler method.

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“…[7] into Eq. [15], the relationship between the stress amplitude and fatigue life is [16] Let [17] Dividing Eq. [16] by the elastic modulus and adding Eq.…”

Section: Total Plastic-strain-energy Density As a Criterion For Fmentioning

confidence: 99%

“…[17] can be obtained. It is also important to state that the preceding method for generating the strainlife curve did not consider the statistical variability in fatigue, and may result in false predictions with improper procedures.…”

Section: Total Plastic-strain-energy Density As a Criterion For Fmentioning

confidence: 99%

Temperature evolution and life prediction in fatigue of superalloys

Jiang¹,

Wang

Liaw

et al. 2004

Metall Mater Trans A

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Low-cycle fatigue behavior of two superalloys, ULTIMET ® alloy, Co-26 pct Cr-9 pct Ni (wt pct), and HAYNES ® HR-120 ® alloy, Ni-33 pct Fe-25 pct Cr, was studied at room temperature. An infrared thermography system was employed to monitor the temperature evolution of fatigue processes for both superalloys. Temperature changes during fatigue were related to the hysteresis effect, and were successfully predicted, based on the consideration of the hysteresis effect and heat conduction. The temperature increase of a specimen from the initial to the equilibrium stages was used as an index to predict the fatigue life of the two superalloys. It was found that the fatigue-life predictions using the present model were in good agreement with the experimental results.

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Thermographic investigation of the fatigue behavior of reactor pressure vessel steels

Cited by 103 publications

References 9 publications

On the thermodynamic entropy of fatigue fracture

On the thermodynamic entropy of fatigue fracture

Numerical Simulation on Rapid Evaluation of Fatigue Limit through Temperature Evolution

Temperature evolution and life prediction in fatigue of superalloys

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