Crack initiation under thermal fatigue: An overview of CEA experiencePart II (of II): Application of various criteria to biaxial thermal fatigue tests and a first proposal to improve the estimation of the thermal fatigue damage

Fissolo, A.; Gourdin, C.; Ancelet, O.; Amiable, Sébastien; Demassieux, A.; Chapuliot, S.; Haddar, Nader; Mermaz, F.; Stelmaszyk, Jean Marc; Constantinescu, Andréï

doi:10.1016/j.ijfatigue.2008.11.018

Cited by 39 publications

(23 citation statements)

References 43 publications

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“…In order to assess thermal fatigue occurring in nuclear power plants [1][2][3], a new experimental setup is developed for which thermal shocks are applied to stainless steel plates with a pulsed laser [4]. IR and visible light cameras are used to measure 2D kinematic and thermal fields, respectively [5].…”

Section: Introductionmentioning

confidence: 99%

Hybrid Stereocorrelation Using Infrared and Visible Light Cameras

et al. 2016

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3D kinematic fields are measured using an original stereovision system composed of one infrared (IR) and one visible light camera. Global stereocorrelation (SC) is proposed to register pictures shot by both imaging systems. The stereo rig is calibrated by using a NURBS representation of the 3D target. The projection matrices are determined by an integrated approach. The effect of gray level and distortion corrections is assessed on the projection matrices. SC is performed once the matrices are calibrated to measure 3D displacements. Amplitudes varying from 0 to 800 µm are well captured for in-plane and out-ofplane motions. It is shown that when known rigid body translations are applied to the target, the calibration can be improved when its actual metrology is approximate. Applications are shown for two different setups for which the resolution of the IR camera has been modified.

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Section: Introductionmentioning

confidence: 99%

Hybrid Stereocorrelation Using Infrared and Visible Light Cameras

et al. 2016

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“…The criteria for assessing the number of cycles to initiation of a thermal fatigue crack are discussed in [1, 23,24].…”

Section: Calculation Of Thermal Fatigue Crack Growth Kinetics In a Blmentioning

confidence: 99%

Methods of Computational Determination of Growth Rates of Fatigue, Creep, and Thermal Fatigue Cracks in Poly- and Monocrystalline Blades of Gas Turbine Units

Семенов

Semenov

Getsov³

2015

Strength Mater

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The crack growth kinetics of fatigue, creep, and thermal fatigue cracks in blades of gas turbine units is studied through a direct three-dimensional finite-element stepwise modeling of the crack propagation process. Prediction of crack growth rate involves the use of the criteria based on stress intensity factors (or J-integrals) for fatigue cracks, on C * -integrals for creep cracks, and on a combination of stress intensity factors (or J-integrals) and C * -integrals for thermal fatigue cracks. The authors discuss the methods for determination of fatigue life of polycrystalline blades as well as some special features of calculations of the crack growth kinetics in monocrystalline blades. The paper presents some examples of results of finite-element calculations of the fatigue, creep, and thermal fatigue crack growth processes in rotating blades of gas turbine units.

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“…To assess the risk of thermal fatigue damage [1,2] resulting from the machining of the pipes inner surface (pre-hardening gradient, residual stresses and scratches) , experimental tests on tubular specimens (named INTHERPOL tests), were developed by EDF R&D. Other tests facilities were also developed by CEA [3]. Recently, experimental investigations at room temperature on the fatigue behaviour of pre-hardened stainless steel were carried out by Taleb and Hauet [4], Taheri et al [5].…”

Section: Introductionmentioning

confidence: 99%

Fatigue life prediction for broad-band multiaxial loading with various PSD curve shapes

Niesłony

Růžička

Papuga

et al. 2012

International Journal of Fatigue

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The main purpose of this study is to determine, via a three dimensions Finite Element analysis (FE), the stress and strain fields at the inner surface of a tubular specimen submitted to thermo-mechanical fatigue. To investigate the surface finish effect on fatigue behaviour at this inner surface, mechanical tests were carried out on real size tubular specimens under various thermal loadings. X ray measurements, Transmission Electron Microscopy observations and micro-hardness tests performed at and under the inner surface of the specimen before testing, revealed residual internal stresses and a large dislocation microstructure gradient in correlation with hardening gradients due to machining. A memory effect, bound to the pre-hardening gradient, was introduced into an elasto-visco-plastic model in order to determine the stress and strain fields at the inner surface. The temperature evolution on the inner surface of the tubular specimen was first computed via a thermo-elastic model and then used for our thermo-mechanical simulations. Identification of the thermo-mechanical model parameters was based on the experimental stabilized cyclic tension-compression tests performed at 20°C and 300°C. A good agreement was obtained between numerical stabilized tractioncompression cycle curves (with and without pre-straining) and experimental ones. This 3 dimensional simulation gave access to the evolution of the axial and tangential internal stresses and local strains during the tests. Numerical results showed: a decreasing of the tangential stress and stabilization after 40 cycles, whereas the axial stress showed weaker decreasing with the number of cycles. The results also pointed out a ratcheting and a slightly non proportional loading at the inner surface. The computed mean stress and strain values of the stabilized cycle being far from the initial ones, they could be used to get the safety margins of standard design related to fatigue, as well as to get accurate loading conditions needed for the use of more advanced fatigue analysis and criteria.

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Crack initiation under thermal fatigue: An overview of CEA experiencePart II (of II): Application of various criteria to biaxial thermal fatigue tests and a first proposal to improve the estimation of the thermal fatigue damage

Cited by 39 publications

References 43 publications

Hybrid Stereocorrelation Using Infrared and Visible Light Cameras

Hybrid Stereocorrelation Using Infrared and Visible Light Cameras

Methods of Computational Determination of Growth Rates of Fatigue, Creep, and Thermal Fatigue Cracks in Poly- and Monocrystalline Blades of Gas Turbine Units

Fatigue life prediction for broad-band multiaxial loading with various PSD curve shapes

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