The Experts below are selected from a list of 324 Experts worldwide ranked by ideXlab platform
H. Yuan - One of the best experts on this subject based on the ideXlab platform.
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Investigation of Thermal Gradient Mechanical Fatigue Test Methods for Nickel-based Superalloys
Experimental Mechanics, 2021Co-Authors: J. Sun, H. YuanAbstract:Temperature gradients significantly affect the material Fatigue process. A reliable and robust test procedure is needed for quantifying the effects of temperature gradients on the evolution of Fatigue damage in nickel-based superalloys. The present study aims to develop a radiation heating system for universal material testing machine for simulating thermal gradient Mechanical Fatigue in turbines. The developed heating system mainly consists of halogen lamps, reflectors, cooling subsystems, and control units. Based on extensive experimental and computational investigations, a thermal model is developed for accurate thermo-Mechanical Fatigue testing under given temperature gradients in the heating system, and it is applied to variable temperature Fatigue tests. The detail procedure for determining heat transfer coefficients is presented based on experimental and computational results. TGMF tests are successfully performed with the developed radiation heating system. The temperature gradients are found to reduce the TGMF life significantly in comparison to that of the TMF life. It is confirmed that the developed thermal gradient Mechanical Fatigue methodology can be applied to different thermo-Mechanical Fatigue tests with various temperature gradients.
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Assessment of thermo-Mechanical Fatigue in a nickel-based single-crystal superalloy CMSX-4 accounting for temperature gradient effects
Materials Science and Engineering: A, 2021Co-Authors: J. Sun, Shun Yang, H. YuanAbstract:Abstract Turbine blades are working under complex thermal gradient Mechanical loading conditions. In the present study, a nickel-based single-crystal superalloy CMSX-4 is experimentally and computationally investigated under the thermo-Mechanical Fatigue (TMF) and thermal gradient Mechanical Fatigue (TGMF) loading conditions of the in-phase and out-of-phase thermal-Mechanical angel. The Fatigue life of TGMF with and without the thermal barrier coating was studied. It was confirmed that the lifetime of TGMF is affected by the temperature gradient significantly and substantially differs from conventional isothermal high temperature Fatigue and thermo-Mechanical Fatigue. Since conventional Fatigue models fail to characterize the TGMF, a modified model considers temperature gradient effects and thermal-Mechanical phase angle and can describe the TGMF lifetime of the single-crystal superalloy reasonably.
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Thermal gradient Mechanical Fatigue assessment of a nickel-based superalloy
International Journal of Fatigue, 2020Co-Authors: J. Sun, H. Yuan, Michael VormwaldAbstract:Abstract In the present work, a radiation heating system was developed to simulate thermal gradient Mechanical Fatigue (TGMF) loads in turbines. The specimen is externally heated by radiation and internally cooled by compressed air. Experiments showed that the TGMF life of the nickel-based superalloy is significantly shorter than that of the thermo-Mechanical and the isothermal Fatigue, although the thermal stress is small. It was confirmed that the conventional Fatigue models generated seriously deviations and could not catch effects of the thermal gradients. The modified TGMF model introduced a correction term of the temperature gradient effects and can describe the TGMF lifetime of Inconel 718 reasonably. The new model provides a uniform description of isothermal and complex thermo-Mechanical Fatigue.
Johan Moverare - One of the best experts on this subject based on the ideXlab platform.
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On the correlation between microstructural parameters and the thermo-Mechanical Fatigue performance of cast iron
International Journal of Fatigue, 2021Co-Authors: E. Kihlberg, Viktor Norman, Peter Skoglund, Pål Schmidt, Johan MoverareAbstract:Abstract Strain-controlled out-of-phase thermo-Mechanical Fatigue tests at 100–500 °C and various strain ranges were conducted on five cast iron grades, including one lamellar, three compacted and one spheroidal graphite iron. Investigations of graphite morphology and matrix characteristics were performed to associate parameters, such as geometrical features of graphite inclusions and the matrix microhardness, to the thermo-Mechanical Fatigue performance of each grade. From this, thermo-Mechanical Fatigue life as a function of maximum stress at half-life, is found to decrease consistently with increasing average graphite inclusion length irrespective of the graphite content. In contrast, no evident correlation between the Fatigue life and the matrix microhardness is observed.
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damage mechanisms in silicon molybdenum cast irons subjected to thermo Mechanical Fatigue
International Journal of Fatigue, 2017Co-Authors: Viktor Norman, Peter Skoglund, Daniel Leidermark, Johan MoverareAbstract:The damage mechanisms active in silicon-molybdenum cast irons, namely EN-GJS-SiMo5-1 and SiMo1000, under thermo-Mechanical Fatigue and combined thermo-Mechanical and high-cycle Fatigue conditions h ...
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Crack Initiation and Propagation During Thermal-Mechanical Fatigue on IN792: Effects of Dwell Time
Superalloys 2016, 2016Co-Authors: Paraskevas Kontis, Johan Moverare, David M. Collins, Sten Johansson, Angus J. Wilkinson, Roger C. ReedAbstract:Crack Initiation and Propagation During Thermal-Mechanical Fatigue on IN792: Effects of Dwell Time
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The effect of superimposed high-cycle Fatigue on thermo-Mechanical Fatigue in cast iron
International Journal of Fatigue, 2016Co-Authors: Viktor Norman, Peter Skoglund, Daniel Leidermark, Johan MoverareAbstract:The eect of superimposing a high-cycle Fatigue strain load on an out-ofphase thermo-Mechanical Fatigue test of a lamellar, compacted and spheroidal graphite iron, has been investigated. In particul ...
Thomas Lenoir - One of the best experts on this subject based on the ideXlab platform.
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Mechanical Fatigue behavior in treated stabilized soils subjected to a uniaxial flexural test
International Journal of Fatigue, 2015Co-Authors: Mathieu Preteseille, Thomas LenoirAbstract:The use of in situ fine-grained soils treated with lime and/or hydraulic binders as subgrade in common civil engineering infrastructures is a sustainable upgrading process for natural materials with low Mechanical performances. In the case of land transport projects, the lack of knowledge on Mechanical Fatigue behavior in these materials leads either to empirical oversized design of the layers made with these materials or to their rejection. However, the development of a relevant test now enables us to accurately measure the Mechanical Fatigue performances of treated soils. First, sample preparation appears to explain most Fatigue performances, not sample mineralogy. Second, based on original results on three treated soils and previous results from the literature, it seems that a behavior law governs these performances. Finally, a simple classification tool shows that these materials can be considered within the entirety of transport infrastructures from subgrade layers to subbase layers.
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Mechanical Fatigue behavior in treated/stabilized soils subjected to a uniaxial flexural test
International Journal of Fatigue, 2015Co-Authors: Mathieu Preteseille, Thomas LenoirAbstract:The use of in situ fine-grained soils treated with lime and/or hydraulic binders as subgrade in common civil engineering infrastructures is a sustainable upgrading process for natural materials with low Mechanical performances. In the case of land transport projects, the lack of knowledge on Mechanical Fatigue behavior in these materials leads either to empirical oversized design of the layers made with these materials or to their rejection. However, the development of a relevant test now enables us to accurately measure the Mechanical Fatigue performances of treated soils. First, sample preparation appears to explain most Fatigue performances, not sample mineralogy. Second, based on original results on three treated soils and previous results from the literature, it seems that a behavior law governs these performances. Finally, a simple classification tool shows that these materials can be considered within the entirety of transport infrastructures from subgrade layers to subbase layers.
J. Sun - One of the best experts on this subject based on the ideXlab platform.
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Investigation of Thermal Gradient Mechanical Fatigue Test Methods for Nickel-based Superalloys
Experimental Mechanics, 2021Co-Authors: J. Sun, H. YuanAbstract:Temperature gradients significantly affect the material Fatigue process. A reliable and robust test procedure is needed for quantifying the effects of temperature gradients on the evolution of Fatigue damage in nickel-based superalloys. The present study aims to develop a radiation heating system for universal material testing machine for simulating thermal gradient Mechanical Fatigue in turbines. The developed heating system mainly consists of halogen lamps, reflectors, cooling subsystems, and control units. Based on extensive experimental and computational investigations, a thermal model is developed for accurate thermo-Mechanical Fatigue testing under given temperature gradients in the heating system, and it is applied to variable temperature Fatigue tests. The detail procedure for determining heat transfer coefficients is presented based on experimental and computational results. TGMF tests are successfully performed with the developed radiation heating system. The temperature gradients are found to reduce the TGMF life significantly in comparison to that of the TMF life. It is confirmed that the developed thermal gradient Mechanical Fatigue methodology can be applied to different thermo-Mechanical Fatigue tests with various temperature gradients.
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Assessment of thermo-Mechanical Fatigue in a nickel-based single-crystal superalloy CMSX-4 accounting for temperature gradient effects
Materials Science and Engineering: A, 2021Co-Authors: J. Sun, Shun Yang, H. YuanAbstract:Abstract Turbine blades are working under complex thermal gradient Mechanical loading conditions. In the present study, a nickel-based single-crystal superalloy CMSX-4 is experimentally and computationally investigated under the thermo-Mechanical Fatigue (TMF) and thermal gradient Mechanical Fatigue (TGMF) loading conditions of the in-phase and out-of-phase thermal-Mechanical angel. The Fatigue life of TGMF with and without the thermal barrier coating was studied. It was confirmed that the lifetime of TGMF is affected by the temperature gradient significantly and substantially differs from conventional isothermal high temperature Fatigue and thermo-Mechanical Fatigue. Since conventional Fatigue models fail to characterize the TGMF, a modified model considers temperature gradient effects and thermal-Mechanical phase angle and can describe the TGMF lifetime of the single-crystal superalloy reasonably.
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Thermal gradient Mechanical Fatigue assessment of a nickel-based superalloy
International Journal of Fatigue, 2020Co-Authors: J. Sun, H. Yuan, Michael VormwaldAbstract:Abstract In the present work, a radiation heating system was developed to simulate thermal gradient Mechanical Fatigue (TGMF) loads in turbines. The specimen is externally heated by radiation and internally cooled by compressed air. Experiments showed that the TGMF life of the nickel-based superalloy is significantly shorter than that of the thermo-Mechanical and the isothermal Fatigue, although the thermal stress is small. It was confirmed that the conventional Fatigue models generated seriously deviations and could not catch effects of the thermal gradients. The modified TGMF model introduced a correction term of the temperature gradient effects and can describe the TGMF lifetime of Inconel 718 reasonably. The new model provides a uniform description of isothermal and complex thermo-Mechanical Fatigue.
Mathieu Preteseille - One of the best experts on this subject based on the ideXlab platform.
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Mechanical Fatigue behavior in treated stabilized soils subjected to a uniaxial flexural test
International Journal of Fatigue, 2015Co-Authors: Mathieu Preteseille, Thomas LenoirAbstract:The use of in situ fine-grained soils treated with lime and/or hydraulic binders as subgrade in common civil engineering infrastructures is a sustainable upgrading process for natural materials with low Mechanical performances. In the case of land transport projects, the lack of knowledge on Mechanical Fatigue behavior in these materials leads either to empirical oversized design of the layers made with these materials or to their rejection. However, the development of a relevant test now enables us to accurately measure the Mechanical Fatigue performances of treated soils. First, sample preparation appears to explain most Fatigue performances, not sample mineralogy. Second, based on original results on three treated soils and previous results from the literature, it seems that a behavior law governs these performances. Finally, a simple classification tool shows that these materials can be considered within the entirety of transport infrastructures from subgrade layers to subbase layers.
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Mechanical Fatigue behavior in treated/stabilized soils subjected to a uniaxial flexural test
International Journal of Fatigue, 2015Co-Authors: Mathieu Preteseille, Thomas LenoirAbstract:The use of in situ fine-grained soils treated with lime and/or hydraulic binders as subgrade in common civil engineering infrastructures is a sustainable upgrading process for natural materials with low Mechanical performances. In the case of land transport projects, the lack of knowledge on Mechanical Fatigue behavior in these materials leads either to empirical oversized design of the layers made with these materials or to their rejection. However, the development of a relevant test now enables us to accurately measure the Mechanical Fatigue performances of treated soils. First, sample preparation appears to explain most Fatigue performances, not sample mineralogy. Second, based on original results on three treated soils and previous results from the literature, it seems that a behavior law governs these performances. Finally, a simple classification tool shows that these materials can be considered within the entirety of transport infrastructures from subgrade layers to subbase layers.