Evaluation of the room-temperature strength of oxide fibres produced by the internal-crystallization method

Oxide fibres produced by the internal crystallization route have been used in a variety of matrices to yield heat-resistant composites. These fibres a rt: crystallized in channels previously made in the molybdenum matrix by di ffusion bonding of an assembly of molybdenum foils and wires, so that their cross-section has an unusual shape. Hence. a special procedure is necessar y for evaluating the fibre strength. The procedure developed includes loopi ng a fibre around a series of the rigid cylinders of successively smaller d iameters and calculating the tensile strength by using a procedure based on Weibull statistics. (C) 1999 Elsevier Science Ltd. All rights reserved.