Sesearch on the mechanism of debonding process on the matrix-reinforcement interface of metai-matrix composites and the development of the method of analysis

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Results obtained in the present project are summarized as follows ;1.Fiber-reinforced MMC : Creep damage in an SiC-whisker reinforced Al allpy was numerically simulated by using a unit cell model. The creep damage was revealed to initiate at the edge of whisker, from which a subsequent debonding developed. An FEM code was established for quenching process of MMC.The formation of voids and progress of damage initiated from voids were found to occur along the inteface.2.Particle-dispersed MMC : Alminum dispersed with SiC particles was processed by a centrifugal casting method. The effect of casting condition on the radial distribution of particles was clarified experimentally. A FEM code for elastic-viscoplastic strees analysis was constructed based on the solidification of molten matrix considering the particle motion. The validity of the code was confirmed by experimental results.3.Surface-modified MMC : A FEM code was proposed by modeling the detonation-coating process of ceramics on a metal surface. A large tensile stress was found to occur in coated layr. The equivalent stress of Mises type may control the failure of detonation-coated layr in an alumina-coated stainless steel under biaxial loading. Structural analysis using a molecular dynamics procedure developed for sputtering process suggested that an anchor effect was the main mechanism of interface bonding.