Abstract
In this article, we discuss the influence of interface damage on the uniaxial tensile elastic–plastic behavior of metal matrix composites (MMCs) that are reinforced by spherical or cubic particles having identical distribution and volume fraction. The mechanical property of the composites was simulated by a three-dimensional periodic finite-element model where we adopted the bilinear cohesive zone model to describe the failure behavior of particle/matrix interface and considered the influence of strain gradient in the matrix. Interface morphology has a strong influence on the mechanical properties. Under perfect interface bonding, MMC reinforced by cubic particles exhibits higher tensile strength than that reinforced by spherical particles. When interface damage exists, the strength of the composites decreases and MMC reinforced by two types of particles exhibit identical performance except a higher uniform strain in the spherical-reinforced one. An examination of interface decohesion indicates that damage occurs when the applied strain is as small as 1%. Compared with the perfectly bonded interface, debonded interface in MMC with cubic particles suffers more severe damage, which causes further decrease in average stress along tensile direction.
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