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):

Report Date:

1991-10-01

Pagination or Media Count:

34.0

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 particlematrix interface becomes a potential crack initiation site under thermal cycling. The critical internal pressure for plastic deformation is less than 23 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.

Subject Categories:

  • Laminates and Composite Materials
  • Properties of Metals and Alloys
  • Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE