The Experts below are selected from a list of 324 Experts worldwide ranked by ideXlab platform

Yoshiharu Mutoh - One of the best experts on this subject based on the ideXlab platform.

  • tangential Stress range Compressive Stress range diagram for fretting fatigue design curve
    Tribology International, 2011
    Co-Authors: Yoshiharu Mutoh
    Abstract:

    Abstract Fretting fatigue strength can be effectively predicted regardless of pad geometry, rigidity, contact pressure and slip amplitude based on the tangential Stress range–Compressive Stress range diagram. However, the tangential Stress range–Compressive Stress range diagram is a material property and applicable only to the material concerned. In the present study, a new approach for predicting fretting fatigue strength irrespective of material has been proposed based on a generalized tangential Stress range–Compressive Stress range diagram. The generalized tangential Stress range–Compressive Stress range diagram was obtained by normalizing the tangential Stress range and Compressive Stress range values by tensile strength of each material. It was found that the generalized tangential Stress range–Compressive Stress range diagrams for all the steels merged to one line and could be applicable for predicting fretting fatigue strength of wide range of steels.

  • Tangential Stress range–Compressive Stress range diagram for fretting fatigue design curve
    Tribology International, 2011
    Co-Authors: Yoshiharu Mutoh
    Abstract:

    Abstract Fretting fatigue strength can be effectively predicted regardless of pad geometry, rigidity, contact pressure and slip amplitude based on the tangential Stress range–Compressive Stress range diagram. However, the tangential Stress range–Compressive Stress range diagram is a material property and applicable only to the material concerned. In the present study, a new approach for predicting fretting fatigue strength irrespective of material has been proposed based on a generalized tangential Stress range–Compressive Stress range diagram. The generalized tangential Stress range–Compressive Stress range diagram was obtained by normalizing the tangential Stress range and Compressive Stress range values by tensile strength of each material. It was found that the generalized tangential Stress range–Compressive Stress range diagrams for all the steels merged to one line and could be applicable for predicting fretting fatigue strength of wide range of steels.

E. J. Mittemeijer - One of the best experts on this subject based on the ideXlab platform.

  • martensite formation kinetics of substitutional fe 0 7at al alloy under uniaxial Compressive Stress
    Acta Materialia, 2015
    Co-Authors: Yongchang Liu, Ferdinand Sommer, E. J. Mittemeijer, Chenxi Liu
    Abstract:

    Abstract Differential dilatometry was applied to investigate the effect of an applied constant uniaxial Compressive Stress on the kinetics of the austenite (γ) → martensite (α′) transformation in the substitutional Fe–0.7 at.%Al alloy upon isochronal cooling/quenching with constant rate. All imposed Stress levels are below the yield Stresses of γ and α′ phases in the temperature range of the martensite formation. Albeit the start temperature of the γ → α′ transformation remains approximately constant in the range of Stress explored, the overall transformation temperature range increases significantly with the increase of the uniaxial Compressive Stress. A modular phase transformation model, adopting a model for continuous nucleation and an anisotropic thermally-activated growth model, yielding a corresponding impingement correction, was employed to extract the nucleation rate and the γ/α′-interface velocity during the transformation. The kinetic analysis suggests that athermal nucleation and thermally activated growth govern the martensite transformation under the uniaxial Compressive Stress. More driving force is required when a larger uniaxial Compressive Stress is imposed, and the thus obtained velocity of the γ/α′-interface as function of temperature indicates a thermally activated growth governed by a relatively low activation energy.

  • austenite ferrite transformation kinetics under uniaxial Compressive Stress in fe 2 96 at ni alloy
    Acta Materialia, 2009
    Co-Authors: Yongchang Liu, Ferdinand Sommer, E. J. Mittemeijer
    Abstract:

    Abstract The effect of an applied constant uniaxial Compressive Stress on the kinetics of the austenite (γ) → ferrite (α) massive transformation in the substitutional Fe–2.96 at.% Ni alloy upon isochronal cooling has been studied by differential dilatometry. All imposed Stress levels are below the yield Stress of austenite and ferrite in the temperature range of the transformation. An increase in Compressive Stress results in a small but significant increase of the onset temperature of the γ → α transformation and a decrease of the overall transformation time. A phase transformation model, involving site saturation, interface-controlled growth and incorporation of an appropriate impingement correction, has been employed to extract the interface-migration velocity of the γ/α interface. The interface-migration velocity for the γ → α transformation is approximately constant at fixed uniaxial Compressive Stress and increases with increasing applied uniaxial Compressive Stress. Furthermore, the value obtained for the energy corresponding with the elastic and plastic deformation associated with the accommodation of the γ/α volume misfit depends on the transformed fraction and decreases significantly as the applied uniaxial Compressive Stress increases. An understanding of the observed effects is obtained, recognizing the constraints imposed on the phase transformation due to the applied Stress.

  • Austenite―ferrite transformation kinetics under uniaxial Compressive Stress in Fe―2.96 at.% Ni alloy
    Acta Materialia, 2009
    Co-Authors: Yongchang Liu, Ferdinand Sommer, E. J. Mittemeijer
    Abstract:

    Abstract The effect of an applied constant uniaxial Compressive Stress on the kinetics of the austenite (γ) → ferrite (α) massive transformation in the substitutional Fe–2.96 at.% Ni alloy upon isochronal cooling has been studied by differential dilatometry. All imposed Stress levels are below the yield Stress of austenite and ferrite in the temperature range of the transformation. An increase in Compressive Stress results in a small but significant increase of the onset temperature of the γ → α transformation and a decrease of the overall transformation time. A phase transformation model, involving site saturation, interface-controlled growth and incorporation of an appropriate impingement correction, has been employed to extract the interface-migration velocity of the γ/α interface. The interface-migration velocity for the γ → α transformation is approximately constant at fixed uniaxial Compressive Stress and increases with increasing applied uniaxial Compressive Stress. Furthermore, the value obtained for the energy corresponding with the elastic and plastic deformation associated with the accommodation of the γ/α volume misfit depends on the transformed fraction and decreases significantly as the applied uniaxial Compressive Stress increases. An understanding of the observed effects is obtained, recognizing the constraints imposed on the phase transformation due to the applied Stress.

Sanqiang Yang - One of the best experts on this subject based on the ideXlab platform.

  • Uniaxial Compressive Stress-strain curves of magnesium oxysulfate cement concrete
    Construction and Building Materials, 2020
    Co-Authors: Haiwei Zhu, Sanqiang Yang
    Abstract:

    Abstract To investigate the uniaxial Compressive Stress-strain curves of magnesium oxysulfate cement concrete (MOSC), a new type of magnesium oxysulfate (MOS) cement capable of forming the 5 Mg(OH)2·MgSO4·7H2O phase (5·1·7 phase) was used to replace ordinary Portland cement (OPC) in specimens with C20-C65 strength grades, and the Stress-strain curves of groups of three specimens with dimensions of 100 mm × 100 mm × 300 mm were obtained through uniaxial compression testing. The peak Stress (σp), peak strain (ep), initial modulus of elasticity (Ec), bending point and convergence point of the uniaxial Compressive Stress-strain curves of the MOSC are in good agreement with the model curves. Furthermore, the descending segment of the curve of MOSC is markedly steeper than that of OPC, indicating that MOSC is more brittle. According to the test results, the Compressive Stress-strain curves of the MOSC with C20-C65 strength grades are fitted.

Yongchang Liu - One of the best experts on this subject based on the ideXlab platform.

  • martensite formation kinetics of substitutional fe 0 7at al alloy under uniaxial Compressive Stress
    Acta Materialia, 2015
    Co-Authors: Yongchang Liu, Ferdinand Sommer, E. J. Mittemeijer, Chenxi Liu
    Abstract:

    Abstract Differential dilatometry was applied to investigate the effect of an applied constant uniaxial Compressive Stress on the kinetics of the austenite (γ) → martensite (α′) transformation in the substitutional Fe–0.7 at.%Al alloy upon isochronal cooling/quenching with constant rate. All imposed Stress levels are below the yield Stresses of γ and α′ phases in the temperature range of the martensite formation. Albeit the start temperature of the γ → α′ transformation remains approximately constant in the range of Stress explored, the overall transformation temperature range increases significantly with the increase of the uniaxial Compressive Stress. A modular phase transformation model, adopting a model for continuous nucleation and an anisotropic thermally-activated growth model, yielding a corresponding impingement correction, was employed to extract the nucleation rate and the γ/α′-interface velocity during the transformation. The kinetic analysis suggests that athermal nucleation and thermally activated growth govern the martensite transformation under the uniaxial Compressive Stress. More driving force is required when a larger uniaxial Compressive Stress is imposed, and the thus obtained velocity of the γ/α′-interface as function of temperature indicates a thermally activated growth governed by a relatively low activation energy.

  • austenite ferrite transformation kinetics under uniaxial Compressive Stress in fe 2 96 at ni alloy
    Acta Materialia, 2009
    Co-Authors: Yongchang Liu, Ferdinand Sommer, E. J. Mittemeijer
    Abstract:

    Abstract The effect of an applied constant uniaxial Compressive Stress on the kinetics of the austenite (γ) → ferrite (α) massive transformation in the substitutional Fe–2.96 at.% Ni alloy upon isochronal cooling has been studied by differential dilatometry. All imposed Stress levels are below the yield Stress of austenite and ferrite in the temperature range of the transformation. An increase in Compressive Stress results in a small but significant increase of the onset temperature of the γ → α transformation and a decrease of the overall transformation time. A phase transformation model, involving site saturation, interface-controlled growth and incorporation of an appropriate impingement correction, has been employed to extract the interface-migration velocity of the γ/α interface. The interface-migration velocity for the γ → α transformation is approximately constant at fixed uniaxial Compressive Stress and increases with increasing applied uniaxial Compressive Stress. Furthermore, the value obtained for the energy corresponding with the elastic and plastic deformation associated with the accommodation of the γ/α volume misfit depends on the transformed fraction and decreases significantly as the applied uniaxial Compressive Stress increases. An understanding of the observed effects is obtained, recognizing the constraints imposed on the phase transformation due to the applied Stress.

  • Austenite―ferrite transformation kinetics under uniaxial Compressive Stress in Fe―2.96 at.% Ni alloy
    Acta Materialia, 2009
    Co-Authors: Yongchang Liu, Ferdinand Sommer, E. J. Mittemeijer
    Abstract:

    Abstract The effect of an applied constant uniaxial Compressive Stress on the kinetics of the austenite (γ) → ferrite (α) massive transformation in the substitutional Fe–2.96 at.% Ni alloy upon isochronal cooling has been studied by differential dilatometry. All imposed Stress levels are below the yield Stress of austenite and ferrite in the temperature range of the transformation. An increase in Compressive Stress results in a small but significant increase of the onset temperature of the γ → α transformation and a decrease of the overall transformation time. A phase transformation model, involving site saturation, interface-controlled growth and incorporation of an appropriate impingement correction, has been employed to extract the interface-migration velocity of the γ/α interface. The interface-migration velocity for the γ → α transformation is approximately constant at fixed uniaxial Compressive Stress and increases with increasing applied uniaxial Compressive Stress. Furthermore, the value obtained for the energy corresponding with the elastic and plastic deformation associated with the accommodation of the γ/α volume misfit depends on the transformed fraction and decreases significantly as the applied uniaxial Compressive Stress increases. An understanding of the observed effects is obtained, recognizing the constraints imposed on the phase transformation due to the applied Stress.

Ferdinand Sommer - One of the best experts on this subject based on the ideXlab platform.

  • martensite formation kinetics of substitutional fe 0 7at al alloy under uniaxial Compressive Stress
    Acta Materialia, 2015
    Co-Authors: Yongchang Liu, Ferdinand Sommer, E. J. Mittemeijer, Chenxi Liu
    Abstract:

    Abstract Differential dilatometry was applied to investigate the effect of an applied constant uniaxial Compressive Stress on the kinetics of the austenite (γ) → martensite (α′) transformation in the substitutional Fe–0.7 at.%Al alloy upon isochronal cooling/quenching with constant rate. All imposed Stress levels are below the yield Stresses of γ and α′ phases in the temperature range of the martensite formation. Albeit the start temperature of the γ → α′ transformation remains approximately constant in the range of Stress explored, the overall transformation temperature range increases significantly with the increase of the uniaxial Compressive Stress. A modular phase transformation model, adopting a model for continuous nucleation and an anisotropic thermally-activated growth model, yielding a corresponding impingement correction, was employed to extract the nucleation rate and the γ/α′-interface velocity during the transformation. The kinetic analysis suggests that athermal nucleation and thermally activated growth govern the martensite transformation under the uniaxial Compressive Stress. More driving force is required when a larger uniaxial Compressive Stress is imposed, and the thus obtained velocity of the γ/α′-interface as function of temperature indicates a thermally activated growth governed by a relatively low activation energy.

  • austenite ferrite transformation kinetics under uniaxial Compressive Stress in fe 2 96 at ni alloy
    Acta Materialia, 2009
    Co-Authors: Yongchang Liu, Ferdinand Sommer, E. J. Mittemeijer
    Abstract:

    Abstract The effect of an applied constant uniaxial Compressive Stress on the kinetics of the austenite (γ) → ferrite (α) massive transformation in the substitutional Fe–2.96 at.% Ni alloy upon isochronal cooling has been studied by differential dilatometry. All imposed Stress levels are below the yield Stress of austenite and ferrite in the temperature range of the transformation. An increase in Compressive Stress results in a small but significant increase of the onset temperature of the γ → α transformation and a decrease of the overall transformation time. A phase transformation model, involving site saturation, interface-controlled growth and incorporation of an appropriate impingement correction, has been employed to extract the interface-migration velocity of the γ/α interface. The interface-migration velocity for the γ → α transformation is approximately constant at fixed uniaxial Compressive Stress and increases with increasing applied uniaxial Compressive Stress. Furthermore, the value obtained for the energy corresponding with the elastic and plastic deformation associated with the accommodation of the γ/α volume misfit depends on the transformed fraction and decreases significantly as the applied uniaxial Compressive Stress increases. An understanding of the observed effects is obtained, recognizing the constraints imposed on the phase transformation due to the applied Stress.

  • Austenite―ferrite transformation kinetics under uniaxial Compressive Stress in Fe―2.96 at.% Ni alloy
    Acta Materialia, 2009
    Co-Authors: Yongchang Liu, Ferdinand Sommer, E. J. Mittemeijer
    Abstract:

    Abstract The effect of an applied constant uniaxial Compressive Stress on the kinetics of the austenite (γ) → ferrite (α) massive transformation in the substitutional Fe–2.96 at.% Ni alloy upon isochronal cooling has been studied by differential dilatometry. All imposed Stress levels are below the yield Stress of austenite and ferrite in the temperature range of the transformation. An increase in Compressive Stress results in a small but significant increase of the onset temperature of the γ → α transformation and a decrease of the overall transformation time. A phase transformation model, involving site saturation, interface-controlled growth and incorporation of an appropriate impingement correction, has been employed to extract the interface-migration velocity of the γ/α interface. The interface-migration velocity for the γ → α transformation is approximately constant at fixed uniaxial Compressive Stress and increases with increasing applied uniaxial Compressive Stress. Furthermore, the value obtained for the energy corresponding with the elastic and plastic deformation associated with the accommodation of the γ/α volume misfit depends on the transformed fraction and decreases significantly as the applied uniaxial Compressive Stress increases. An understanding of the observed effects is obtained, recognizing the constraints imposed on the phase transformation due to the applied Stress.