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Aging of Materials

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B. T. Timofeev – One of the best experts on this subject based on the ideXlab platform.

  • Aging of Materials of the equipment of nuclear power plants after designed service life
    Materials Science, 2006
    Co-Authors: I. V. Gorynin, B. T. Timofeev
    Abstract:

    We generalize the results of studying the effect of thermal Aging on the mechanical properties of the base and weld metal of equipment and piping of the first loop of nuclear power plants with VVÉR and RBMK reactors in the course of long-term operation. Comparison of the initial properties of these Materials with those after 10^5 and 2 · 10^5 h of operation shows that the changes are mostly insignificant. Furthermore, the mechanical properties after 30 years are not lower than those required by the Standards PNAÉ G-7-002-86 for the commonly used steel grades and PNAÉ-7-010-89 for the weld metal.

  • Aging of Materials of the equipment of nuclear power plants after designed service life
    Materials Science, 2006
    Co-Authors: I. V. Gorynin, B. T. Timofeev
    Abstract:

    We generalize the results of studying the effect of thermal Aging on the mechanical properties of the base and weld metal of equipment and piping of the first loop of nuclear power plants with VVER and RBMK reactors in the course of long-term operation. Comparison of the initial properties of these Materials with those after 105 and 2 · 105 h of operation shows that the changes are mostly insignificant. Furthermore, the mechanical properties after 30 years are not lower than those required by the Standards PNAE G-7-002-86 for the commonly used steel grades and PNAE-7-010-89 for the weld metal.

Thierry Chotard – One of the best experts on this subject based on the ideXlab platform.

  • A method for experimental thermo-mechanical Aging of Materials submitted to concentrated solar irradiation
    Solar Energy Materials and Solar Cells, 2019
    Co-Authors: Yasmine Lalau, Olivier Faugeroux, Bernard Claudet, Emmanuel Guillot, Damien André, Marc Huger, Alain Proust, Thierry Chotard
    Abstract:

    Abstract Concentrated Solar Technology can produce process heat, power and fuels from solar energy in the temperature range 150–1500 °C, bringing the question of the receiver ability to reliably perform over the expected lifetime. Conventional methods commonly used to assess the mechanical stability and lifetime involve in-door laboratory testing, which suffers from the fundamental inability to reproduce the real operating conditions. A previous work introduced an original experimental setup based on acoustic emission named IMPACT (In situ thermo-Mechanical Probe by ACoustic Tracking), designed for an in situ and passive characterization of receiver Materials under harsh thermo-mechanical stresses. This paper proposes an original method, based on a modelling approach, to control the sample damage amplification with IMPACT, and assess its relevance through an experimental campaign on two selected Materials (SiC and Inconel 625).

Jean-félix Durastanti – One of the best experts on this subject based on the ideXlab platform.

  • Non-destructive testing method to quantify Aging of Materials by its apparent emissivity: Case of glass-based reflectors
    Applied Thermal Engineering, 2017
    Co-Authors: Olivier Riou, Fabien Delaleux, Vincent Guiheneuf, Harold Espargilliere, Pierre-olivier Logerais, Régis Olives, Jean-félix Durastanti
    Abstract:

    Abstract In this paper, the measurement capabilities of apparent emissivity are tested by means of a generic LWIR system to quantify the Aging of Materials. A theoretical frame permitted to elaborate abacuses and to correlate a scaling law to identify the relevant parameters, and to foretell performance in terms of absolute Aging time interval resolution as well. The predictions are done for both indoor and outdoor situations. They are compared with measurements performed on glass-based mirrors of a heliostat of the solar furnace of Odeillo after having undergone a Damp Heat accelerated Aging test. Apparent emissivity measurements implement an indoor home-made device which had already been characterized. The performances are in accordance with the predictions and allow to discriminate initial natural Aging of glass mirror combined with accelerated Aging with an interval resolution from 4 to 10 years keeping in mind that we are in quest of differentiating two mirror glasses or of quantifying the absolute Aging of each mirror. Limitations of indoor measurements come mainly from the accuracy of Non-Uniformity Correction and from the internal drift compensation inherent to any IR system. Outdoor performances are foreseen to be as efficient by optimizing the contrast t app . – t env . . If we consider an uncertainty of emitting temperature of 0.25 °C and the one of apparent temperature of 0.1 °C, a standard outdoor thermography would enable to discriminate absolute Aging produced by Damp Heat test with a 10 standard year resolution.

Pascale Guigue – One of the best experts on this subject based on the ideXlab platform.

  • Aging of thermal coatings on low earth orbit in flight measurements and modeling
    Journal of Spacecraft and Rockets, 2016
    Co-Authors: Emilie Vanhove, J F Roussel, Stephanie Remaury, Delphine Faye, Pascale Guigue
    Abstract:

    The Aging of thermal coatings critically impacts spacecraft thermal balance. Because few in-flight data were available about the Aging of Materials after a long exposure on sun-synchronous orbit, Centre National d’Etudes Spatiales developed a low-cost experiment called THERME aiming to characterize the evolution of solar absorptivity through a temperature measurement. A data set covering 27 years has thus been generated. The objective of this work is to analyze this very large set of telemetry measurements, taking into account the available satellite parameters (orbit and orientation) and environmental parameters (ultraviolet and atomic oxygen) to identify the most likely causes for the solar absorptivity evolution. To this end, a quantitative model of the evolutions of solar absorptivity has been developed. This model includes the intrinsic degradation of the substrate under ultraviolet radiation, the degradation attributed to contamination, and the erosion of this contamination by atomic oxygen. Althoug…

  • Aging of Thermal Coatings on Low Earth Orbit: In-Flight Measurements and Modeling
    Journal of Spacecraft and Rockets, 2016
    Co-Authors: Emilie Vanhove, J F Roussel, Stephanie Remaury, Delphine Faye, Pascale Guigue
    Abstract:

    The Aging of thermal coatings critically impacts spacecraft thermal balance. Because few in-flight data were available about the Aging of Materials after a long exposure on sun-synchronous orbit, Centre National d’Études Spatiales developed a low-cost experiment called THERME aiming to characterize the evolution of solar absorptivity through a temperature measurement. A data set covering 27 years has thus been generated. The objective of this work is to analyze this very large set of telemetry measurements, taking into account the available satellite parameters (orbit and orientation) and environmental parameters (ultraviolet and atomic oxygen) to identify the most likely causes for the solar absorptivity evolution. To this end, a quantitative model of the evolutions of solar absorptivity has been developed. This model includes the intrinsic degradation of the substrate under ultraviolet radiation, the degradation attributed to contamination, and the erosion of this contamination by atomic oxygen. Although deliberately simple to limit the number of model parameters, it enables one to satisfyingly reproduce the time evolution of solar absorptivity and to explain the differences observed depending on the solar cycle, on the orbit of the satellite and on the position of the THERME devices on the satellite.

I. V. Gorynin – One of the best experts on this subject based on the ideXlab platform.

  • Aging of Materials of the equipment of nuclear power plants after designed service life
    Materials Science, 2006
    Co-Authors: I. V. Gorynin, B. T. Timofeev
    Abstract:

    We generalize the results of studying the effect of thermal Aging on the mechanical properties of the base and weld metal of equipment and piping of the first loop of nuclear power plants with VVÉR and RBMK reactors in the course of long-term operation. Comparison of the initial properties of these Materials with those after 10^5 and 2 · 10^5 h of operation shows that the changes are mostly insignificant. Furthermore, the mechanical properties after 30 years are not lower than those required by the Standards PNAÉ G-7-002-86 for the commonly used steel grades and PNAÉ-7-010-89 for the weld metal.

  • Aging of Materials of the equipment of nuclear power plants after designed service life
    Materials Science, 2006
    Co-Authors: I. V. Gorynin, B. T. Timofeev
    Abstract:

    We generalize the results of studying the effect of thermal Aging on the mechanical properties of the base and weld metal of equipment and piping of the first loop of nuclear power plants with VVER and RBMK reactors in the course of long-term operation. Comparison of the initial properties of these Materials with those after 105 and 2 · 105 h of operation shows that the changes are mostly insignificant. Furthermore, the mechanical properties after 30 years are not lower than those required by the Standards PNAE G-7-002-86 for the commonly used steel grades and PNAE-7-010-89 for the weld metal.