Effective Elastic Moduli and Characterization of a Particulate-Reinforced Metal Matrix Composite with Damaged Particles

摘要

A brief derivation of the expression is given for the effective bulk modulus of discontinuouslyudreinforced metal matrix composites (DMMCs) with damaged particles (either complete voidsudas shattered particles or debonded particles). The analytical results are then compared withudelastic moduli determined from nondestructive ultrasonic wave speed measurements of SiCudparticle-reinforced titanium matrix composites produced via shock wave consolidation. Forudthe shock consolidated Ti-SiC metal matrix composites compacts, the overall particle damageudmode is found to be similar to debonded particles and the effective volume fraction ofuddamaged particles is determined to be 39% based on the data of both Young's and bulkudmoduli. Ultrasonic wave speed measurements combining with analytical and/or numericaludresults on overall elastic properties (Young's, bulk, and shear moduli, and Poisson's ratio)udcould be a useful tool in assessing the damage of particles in DMMCs.