Size and Volume Fraction Effects on Fracture Behavior in Composite Materials.

摘要

The results of studies on the fracture behavior of metal matrix composite materials are summarized. These studies were conducted on both eutectic and 'bundle-and-draw'metal matrix composites. In the latter type of composite,two types of fracture mode were observed:in 'instantaneous'fracture,composite failure is concurrent with the failure of the first fiber;in 'stepwise'fracture,additional composite elongation after the first fiber break was necessary to induce composite fracture. The eutectic composite (Al-Al3Ni) studied failed generally by a statistical accumulation of fiber fractures. Analysis of fiber fracture prior to composite failure allowed a more accurate partitioning of stress between fiber and matrix as well as determination of insitu fiber ineffective lengths and distributive in breaking strengths. (Modified author abstract)