• estimation of local stresses and elastic properties of a mortar sample by fft computation of fields on a 3d image

    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 1041
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     this study concerns the prediction of the elastic properties of a 3d mortar image, obtained by micro-tomography, using a combined image segmentation and numerical homogenization approach. the microstructure is obtained by segmentation of the 3d image into aggregates, voids and cement paste. full-fields computations of the elastic response of mortar are undertaken using the fast fourier transform method. emphasis is made on highly-contrasted properties between aggregates and matrix, to anticipate needs for creep or damage computation. the representative volume element, i.e. the volume size necessary to compute the effective properties with a prescribed accuracy, is given. overall, the volumes used in this work were sufficient to estimate the effective response of mortar with a precision of 5%, 6% and 10% for contrast ratios of 100, 1000 and 10,000, resp. finally, a statistical and local characterization of the component of the stress field parallel to the applied loading is carried out.

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