발간논문

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Vol.33, No.4, 525 ~ 531, 1995
Title
Characterization of Thermomechanical Fatigue Failure Behavior of Tungsten / Copper Matrix composites
이용석Yong Suk Kim, M . J . Verrilli
Abstract
High-temperature thermomechanical fatigue (TMF) failure of a 9 vol% tungsten-fiber-reinforced copper matrix composite was characterized. It was found that deformation of the copper matrix controls failure of the composite under both in-phase and out-of-phase TMF conditions. Cracks were initiated inside the copper matrix and propagated through cavity nucleation and coalescence processes. Final failure of the composite ensued from the failure of fibers. Matrix damage of the out-of-phase TMF tested specimen appeared more severe than that of the in-phase TMF One-dimensional elastic-inelastic analysis showed that the matrix of the out-of-phase TMF specimen experienced more inelastic tensile and compressive deformation, while under the in-phase condition, the matrix experienced all tensile deformation. The analysis explained the Large matrix damage under the out-of-phase TMF condition and the shorter fatigue life of the in-phase tested specimen.
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