Abstract
The mechanical properties of metal matrix composites (MMCs) have made them ideal materials for use in applications where increased material performance is required. Their potential use in the military and aerospace industries has resulted in a widespread investigation into their mechanical properties to determine optimum fabrication techniques for enhanced composite strength. Of the many destructive and nondestructive techniques available for the measurement of composite properties, ultrasonic nondestructive evaluation (NDE) has emerged as a useful tool to the researcher for the study of the mechanical behavior of MMCs. Therefore, an ultrasonic determination of the composite properties can provide insight as to how the material can be enhanced by changes either in composition or fabrication techniques. To this end, the second-and third-order elastic constants were measured in silicon carbide-(SiC) reinforced aluminum alloys and in monolithic silicon carbide as a function of temperature and second-phase. The results give not only the widely used engineering data such as the Young’s and shear moduli, but also an indication as to the degree of nonlinearity present in these materials, and how the second-and third-order properties change with the introduction of a second-phase.
Published Version
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