三次元境界要素法による動的応力集中係数の解析法

抄録

Three-dimensional impulsive stresses are analyzed by the boundary element method with the Laplace transformation and the numerical inversion using the fast Fourier transformation. The accuracy of the numerical integral in the non diagonal terms of the coefficient matrices obtained from the discreteness of the boundary integral equations are maintained well for the series expansion of the foundamental solutions. As a result, the stresses on the boundary given for the numerical tangential derivatives of the surface displacements and the surface forces are accurately obtained. The singularities do not occur in the dynamic terms, and this procedure is expected to be used only in the calculation of the static terms. As an example of this method, the procedure used to obtain the dynamic stress concentration factors of the cylindrical bar having the hemicircular notch are shown.