Role of Controlled Debonding Along Fiber/Matrix Interfaces in the Strength and Toughness of Both Aligned and Unaligned-Fiber/Metal-Matrix Composites

摘要

In certain metal matrix composites. and specifically in AI alloy aligned fiber Al2O3 composites the debonding response of interfaces adjacent to fiber fractures, in mixed tension and shear has important influences in the strength and toughness of the composite. Coarsening of interface precipitates offers close control of the level of debonding on such interfaces. In the present research computational models were developed for the interface debonding response under mixed tension/shear: fraction/separation response of the interfaces. Additional experiments were also performed on a prototype composite of Al with A12O3 fiber preforms which demonstrated quite considerable toughening effects by fiber bridging in the arranged samples.