Accession Number : ADA255313


Title :   Thermal Fatigue Analysis of Metal Matrix Composite with Spherical Reinforcements


Descriptive Note : Final rept.


Corporate Author : NAVAL AIR DEVELOPMENT CENTER WARMINSTER PA AIR VEHICLE AND CREW SYSTEMS TECHNOLOGY DEPT


Personal Author(s) : Lee, Eun U


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a255313.pdf


Report Date : 01 Oct 1991


Pagination or Media Count : 34


Abstract : The stresses and strains, induced by coefficient of thermal expansion (CTE) mismatch, are analyzed for a metal matrix composite with a spherical reinforcement particle. The spherical reinforcement particle is found to be in a hydrostatic stress state and remains in the elastic state. The stresses and strains are largest, and plastic deformation occurs in the matrix adjacent to the reinforcement particle. Accordingly, the reinforcement particle/matrix interface becomes a potential crack initiation site under thermal cycling. The critical internal pressure for plastic deformation is less than 2/3 of the yield stress of the matrix material and it decreases with increasing range of thermal cycle. From the analytically determined strains, the thermal fatigue life can be estimated.


Descriptors :   *METAL MATRIX COMPOSITES , *THERMAL EXPANSION , PLASTIC DEFORMATION , STRESSES , METALS , MAGNESIUM , FIBERS , FATIGUE LIFE , INTERFACES , STRAIN(MECHANICS) , YIELD , PRESSURE , COEFFICIENTS , ALUMINUM , COPPER , INTERNAL , PARTICLES , CYCLES , ALLOYS , INTERNAL PRESSURE , SUPERALLOYS , TUNGSTEN , SILICON CARBIDES , PLASTICS , BORON , EXPANSION , TITANIUM , THERMAL FATIGUE , FATIGUE , HYDROSTATICS , MATRIX MATERIALS , MATERIALS , DEFORMATION , CRACKS , SITES , ELASTIC PROPERTIES , GRAPHITE


Subject Categories : Laminates and Composite Materials
      Properties of Metals and Alloys
      Mechanics


Distribution Statement : APPROVED FOR PUBLIC RELEASE