SUMMARYThe field equations of three-dimensional elastostatics are transformed to boundary integral equations. The elastic body is divided into subregions, and the surface and interfaces are represented by quadrilateral and triangular elements with quadratic variation of geometry and linear, quadratic Oi cubic variation of displacement and traction with respect to intrinsic co-ordinates. The integral equation is discretized for each subregion, and a system of banded form obtained. For the integration of kernel-shape function products, Gaussian quadrature formulae are chosen according to upper bounds for error in terfns of derivatives of the integrands.
La technique des équations intégrales est utilisée pour déterminer le champ des tensions et des déplacements dans une éprouvette C. T. 15 en acier 35 NCD 16. Le calcul de l'intégrale J de Rice permet de déterminer dans le cadre de la mécanique linéaire de la rupture le facteur d'intensité de contraintes pour plusieurs longueurs de fissure et ces valeurs sont comparées à celles obtenues à partir d'essais ou de calcul par éléments finis
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