EVALUATION OF FIBER STRENGTH CHARACTERISTICS ON THE BASIS OF THE FIBER FRAGMENTATION TEST

A proper description of the fibre fragmentation test becomes more and more important because of the continual development of new types of fi bres, an example being the oxide composite fibres tested in the presen t work. An attempt at a strict formulation of the problem involved in the description of the fibre fragmentation test is presented. It takes into account a distortion of fibre strength distribution function cau sed by the fibre breakage process occurring under increasing external load. The fibre strength distribution function is determined by a dist ribution function of defects on a fibre as well as the distribution fu nction of the defect strength. The formulation of the problem consider ed results in a system of differential equations which is solved assum ing some simplifications. The solution leads to a choice of a particul ar set of statistical fibre strength characteristics. The procedure is applied to oxide composite fibres developed for a high temperature us e.