1201 X線CT画像を用いた三次元ひずみ場の同定とその検証(J01-1 逆問題解析手法の開発と最新応用(1),J01 逆問題解析手法の開発と最新応用)

概要

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We have proposed the full-field digital image correlation for three-dimensional displacement field. The displacement is tentatively defined in the correlation domain of the undeformed state image data by using B-spline basis function. The flat intensity distribution of image data yields the ill-posed problem through the correlation process. The incompressibility constraint is set on the formulation to cope with the solution indeterminacy. The modified objective function of minimization, containing error function of correlation, is derived in line with the penalty function method. The iterative technique of the Levenberg-Marquardt method is employed for the search of the non-linear stationary condition of the modified objective function. The Green-Lagrange strain field is directly calculated by the derivative of identified continuous displacement field. An error in strain field caused by digital property of image data is investigated by using artificial deformation data corresponding rigid translations.
2007-09-07