The Experts below are selected from a list of 44694 Experts worldwide ranked by ideXlab platform

Jianjun Chen - One of the best experts on this subject based on the ideXlab platform.

  • the initiation and propagation of edge cracks of silicon steel during tandem cold rolling process based on the gurson tvergaard needleman damage model
    Journal of Materials Processing Technology, 2013
    Co-Authors: Jianjun Chen
    Abstract:

    Abstract Edge cracking is a commonly observed phenomenon during the cold rolling process of silicon steel, which may cause the rupture of strips in the rolling mill. In this paper the initiation and propagation of edge cracks under the tandem cold rolling condition were investigated by using the Gurson–Tvergaard–Needleman damage model. The damage parameters were obtained from the tensile tests data and the SEM analyses. Different cold rolling experiments were carried out by a non-reversing two-high rolling mill and the experimental results agreed well with the Finite Element Calculation results. Parametric studies were carried out and revealed that the crack propagation increases with the increasing of total reduction, friction coefficient, and unit tension. A bigger work roll is beneficial to reduce the edge crack growth as well.

  • the initiation and propagation of edge cracks of silicon steel during tandem cold rolling process based on the gurson tvergaard needleman damage model
    Journal of Materials Processing Technology, 2013
    Co-Authors: Jianjun Chen
    Abstract:

    Abstract Edge cracking is a commonly observed phenomenon during the cold rolling process of silicon steel, which may cause the rupture of strips in the rolling mill. In this paper the initiation and propagation of edge cracks under the tandem cold rolling condition were investigated by using the Gurson–Tvergaard–Needleman damage model. The damage parameters were obtained from the tensile tests data and the SEM analyses. Different cold rolling experiments were carried out by a non-reversing two-high rolling mill and the experimental results agreed well with the Finite Element Calculation results. Parametric studies were carried out and revealed that the crack propagation increases with the increasing of total reduction, friction coefficient, and unit tension. A bigger work roll is beneficial to reduce the edge crack growth as well.

Jeanclaude Vannier - One of the best experts on this subject based on the ideXlab platform.

  • optimization of magnet segmentation for reduction of eddy current losses in permanent magnet synchronous machine
    IEEE Transactions on Energy Conversion, 2010
    Co-Authors: Wanying Huang, Adel Bettayeb, Robert Kaczmarek, Jeanclaude Vannier
    Abstract:

    Rare earth permanent magnet synchronous machines with the pulsewidth modulated supply are exposed to magnets' heating due to harmonic fields, which rotate in relation to rotor. In cases when skin effect is negligible, the corresponding eddy-current losses in magnets can be reduced by segmentation of magnets. In this paper, we propose an analytical method to evaluate the effect of both circumferential and axial segmentations on losses' reduction in various conditions, concerning the skin effect. With the skin effect operating, the magnets' division may lead to increase rather than decrease of the eddy-current losses. A criterion to determine range of parameters leading to this unexpected situation is presented. Finite-Element Calculation confirms the results of the analysis.

Wanying Huang - One of the best experts on this subject based on the ideXlab platform.

  • optimization of magnet segmentation for reduction of eddy current losses in permanent magnet synchronous machine
    IEEE Transactions on Energy Conversion, 2010
    Co-Authors: Wanying Huang, Adel Bettayeb, Robert Kaczmarek, Jeanclaude Vannier
    Abstract:

    Rare earth permanent magnet synchronous machines with the pulsewidth modulated supply are exposed to magnets' heating due to harmonic fields, which rotate in relation to rotor. In cases when skin effect is negligible, the corresponding eddy-current losses in magnets can be reduced by segmentation of magnets. In this paper, we propose an analytical method to evaluate the effect of both circumferential and axial segmentations on losses' reduction in various conditions, concerning the skin effect. With the skin effect operating, the magnets' division may lead to increase rather than decrease of the eddy-current losses. A criterion to determine range of parameters leading to this unexpected situation is presented. Finite-Element Calculation confirms the results of the analysis.

Johan Deconinck - One of the best experts on this subject based on the ideXlab platform.

  • Finite Element Calculation of crack propagation in type 304 stainless steel in diluted sulphuric acid solutions
    Corrosion Science, 2007
    Co-Authors: Serguei Gavrilov, Marc Vankeerberghen, G. Nelissen, Johan Deconinck
    Abstract:

    Abstract The crack propagation rate of Type 304 stainless steel in diluted sulphuric acid solutions was modelled based on Finite Element Calculations of the chemical and electrochemical conditions within the crack and an analytical expression for the crack-tip strain rate. The slip/dissolution/repassivation mechanism was assumed. The influence of various variables – dissolved oxygen, sulphuric acid content, stress intensity, crack length, temperature, flow rate, sensitization and yield strength – was studied and found to be in agreement with experimental observations. The model was calibrated against one data point. The effect of temperature on thermal conductivity, electrode reaction kinetics, equilibrium constants, yield strength and crack geometry was considered and the thermal activation energy for the crack propagation rate could almost fully be accounted for.

Adel Bettayeb - One of the best experts on this subject based on the ideXlab platform.

  • optimization of magnet segmentation for reduction of eddy current losses in permanent magnet synchronous machine
    IEEE Transactions on Energy Conversion, 2010
    Co-Authors: Wanying Huang, Adel Bettayeb, Robert Kaczmarek, Jeanclaude Vannier
    Abstract:

    Rare earth permanent magnet synchronous machines with the pulsewidth modulated supply are exposed to magnets' heating due to harmonic fields, which rotate in relation to rotor. In cases when skin effect is negligible, the corresponding eddy-current losses in magnets can be reduced by segmentation of magnets. In this paper, we propose an analytical method to evaluate the effect of both circumferential and axial segmentations on losses' reduction in various conditions, concerning the skin effect. With the skin effect operating, the magnets' division may lead to increase rather than decrease of the eddy-current losses. A criterion to determine range of parameters leading to this unexpected situation is presented. Finite-Element Calculation confirms the results of the analysis.