• linear and non-linear analyses for semi-elliptical surface cracks in pipes under bending

    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1390/01/01
    • تاریخ انتشار در تی پی بین: 1390/01/01
    • تعداد بازدید: 491
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     in this paper, the j integral was calculated for semi-elliptical surface cracks in pipes under bending using three-dimensional finite element analysis. the computations were performed for elastic and elastic-plastic behaviours. for the elastic case, the numerical results allowed the extrapolation of shape functions for analytical determination of the j integral. the results are in a good agreement with those in the literature if the ratio between the radius and the thickness of the pipe (r/t) is from 1 to 10. the analysis was extended to values of the ratio r/t higher than 10. for the elastic-plastic, the numerical results are in good agreement with the analytical solution found in the literature for thick pipes (r/t ≥ 10). the effect of the ratio r/t becomes sensible when the ratio of the applied moment to the moment of reference (m/mor) exceeds 0.9.

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