Influence of thermal boundary conditions on stress-strain distribution generated in blade-shaped samples

Mallet, O.; Kaguchi, Hitoshi; Ilschner, Bernhard; Meyer-Olbersleben, F.; Nikbin, Kamran; Rézaï-Aria, Farhad; Webster, G. A.

doi:10.1016/0142-1123(95)95892-k

Cited by 24 publications

(11 citation statements)

References 2 publications

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“…We can observe that the critical element is put into compression during the heating phase (300 MPa) and into tension (400 MPa) when cooling is applied. This result is in good accordance with those reported by Mallet et al 5 The stress loop is stabilized from the second cycle and the mechanical deformation requires 10 cycles to be stabilized. This can be explained by the creep phenomenon because the viscous component becomes important at high temperature.…”

Section: Mechanical Analysissupporting

confidence: 93%

“…6) that the difference between the maximum and the minimum temperature during thermal cycle decreases when the distance from leading edge increases. This result is in good agreement with those found by Mallet et al 5 In fact, those authors have reported similar results, in term of temperature distribution, when studying thermal fatigue of polycrystalline nickel-based superalloy IN100.…”

Section: Figsupporting

confidence: 93%

“…To simplify the experiments, it is enough to take a part of the real structure with simpler shape such as the single‐edge wedge specimen (Fig. 1) to characterize materials in thermal fatigue 4,5 . Typically, specimens are cyclically heated and cooled until crack initiation and failure occur in the specimen.…”

Section: Introductionmentioning

confidence: 99%

“…1) to characterize materials in thermal fatigue. 4,5 Typically, specimens are cyclically heated and cooled until crack initiation and failure occur in the specimen.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Numerical computation of thermal fatigue crack growth of cast iron

Ktari¹,

Haddar²,

Köster³

et al. 2011

Fatigue &Amp; Fracture of Engineering Materials &Amp; Structures

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International audienceThermal fatigue experiments have been carried out on a single-edge wedge specimen of the SiMo cast iron to reproduce the conditions experienced by exhaust manifolds during operation. The leading edge temperature was cycled between 20 and 750 °C and the temperature distribution on the specimen surface was measured by thermocouples throughout the thermal cycle. Due to the complexity of the loading and interaction effects between cracks, numerical simulation of crack propagation and shielding effects in multicracked structures appear a useful way to analyze this problem. Therefore, 3D thermo-mechanical computation was performed with the finite element code ABAQUS of both un-cracked and multicracked specimen. This computation allowed us to assess the temperature, stresses and strains distribution over a thermal fatigue specimen and the estimation of the crack growth rate using the energy criteria based on the calculation of the J-integral crack tip

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Section: Mechanical Analysissupporting

confidence: 93%

Section: Figsupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

“…1) to characterize materials in thermal fatigue. 4,5 Typically, specimens are cyclically heated and cooled until crack initiation and failure occur in the specimen.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Numerical computation of thermal fatigue crack growth of cast iron

Ktari¹,

Haddar²,

Köster³

et al. 2011

Fatigue &Amp; Fracture of Engineering Materials &Amp; Structures

View full text Add to dashboard Cite

show abstract

“…One of the main negative aspects of gas turbine units can be erosion of its hot parts, which increases the maintenance cost. The main element of a gas turbine is its blades, which from design technology, production, and metallurgy are very important [1]. Among turbine stages, the first-row blades are very sensitive [2,3].…”

Section: Introductionmentioning

confidence: 99%

A new conjugate heat transfer method to analyse a 3D steam cooled gas turbine blade with temperature-dependent material properties

Jafari

Atefi

Khalesi

et al. 2011

Proceedings of the Institution of Mechanical Engineers, Part C:

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The erosion of the hot regions in a gas turbine is one of the most important challenges encountered by the power plants. Though several numerical simulations of the problem have been reported so far, little is known to give accurate results. In this article, the thermoelastic behaviour of a gas turbine blade with internal steam-cooled channels positioned within a threedimensional cascade configuration has been studied. A computer code based on the conjugate heat transfer method using the simultaneous solution of Navier-Stokes and heat transfer equations has been developed. From this study, the temperature distribution along with the stress values at high temperatures has been obtained. The blade parameters such as E, , and K were considered to be a function of the temperature. In the previous works, usually only one or two of these parameters was considered as temperature dependent and the others constant. In this article, all the blade parameters, though making the equations highly non-linear, were considered as a function of temperature. The results have been compared with the available experimental data and a good agreement is observed. According to these findings, taking the temperature dependency of materials into account increases the estimations accuracy and brings the results closer to the reality.

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Thermomechanische Ermüdung

Kolmorgen¹,

Biermann²

2014

Moderne Methoden Der WerkstoffprüFung

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Influence of thermal boundary conditions on stress-strain distribution generated in blade-shaped samples

Cited by 24 publications

References 2 publications

Numerical computation of thermal fatigue crack growth of cast iron

Numerical computation of thermal fatigue crack growth of cast iron

A new conjugate heat transfer method to analyse a 3D steam cooled gas turbine blade with temperature-dependent material properties

Thermomechanische Ermüdung

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