Micromechanical model of crack growth in fiber reinforced brittle materialsA model based on the micromechanical mechanism of crack growth resistance in fiber reinforced ceramics is presented. The formulation of the model is based on a small scale geometry of a macrocrack with a bridging zone, the process zone, which governs the resistance mechanism. The effect of high toughness of the fibers in retardation of the crack advance, and the significance of the fiber pullout mechanism on the crack growth resistance, are reflected in this model. The model allows one to address issues such as influence of fiber spacing, fiber flexibility, and fiber matrix friction. Two approaches were used. One represents the fracture initiation and concentrated on the development of the first microcracks between fibers. An exact closed form solution was obtained for this case. The second case deals with the development of an array of microcracks between fibers forming the bridging zone. An implicit exact solution is formed for this case. In both cases, a discrete fiber distribution is incorporated into the solution.
Document ID
19920064205
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Rubinstein, Asher A. (NASA Lewis Research Center Cleveland, OH, United States)
Xu, Kang (Tulane University New Orleans, LA, United States)
Date Acquired
August 15, 2013
Publication Date
January 1, 1990
Subject Category
Structural Mechanics
Meeting Information
Meeting: MRS Symposium on Intermatallic Matrix Composites