Parametric studies to determine the effect of compliant layers on metal matrix composite system
Computational simulation studies are conducted to identify compliant layers to reduce matrix stresses which result from the coefficient of thermal expansion mismatch and the large temperature range over which the current metal matrix composites will be used. The present study includes variations of compliant layers and their properties to determine their influence on unidirectional composite and constituent response. Two simulation methods are used for these studies. The first approach is based on a three-dimensional linear finite element analysis of a 9 fiber unidirectional composite system. The second approach is a micromechanics based nonlinear computer code developed to determine the behavior of metal matrix composite system for thermal and mechanical loads. The results show that an effective compliant layer for the SCS 6 (SiC)/Ti-24Al-11Nb (Ti3Al + Nb) and SCS 6 (SiC)/Ti-15V-3Cr-3Sn-3Al (Ti-15-3) composite systems should have modulus 15 percent that of the matrix and a coefficient of thermal expansion of the compliant layer roughly equal to that of the composite system without the CL. The matrix stress in the longitudinal and the transverse tangent (loop) direction are tensile for the Ti3Al + Nb and Ti-15-3 composite systems upon cool down from fabrication. The fiber longitudinal stress is compressive from fabrication cool down. Addition of a recommended compliant layer will result in a reduction in the composite modulus.
- Research Organization:
- National Aeronautics and Space Administration, Cleveland, OH (USA). Lewis Research Center
- OSTI ID:
- 6972694
- Report Number(s):
- N-90-14294; NASA-TM-102465; E-5252; NAS-1.15:102465; CONF-900439-
- Resource Relation:
- Conference: 35. international symposium and exhibition of the Society of the Advancement of Material and Process Engineering: advanced materials, the challenge for the next decade, Anaheim, CA (USA), 2-5 Apr 1990
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
COMPOSITE MATERIALS
STRESS ANALYSIS
THERMAL EXPANSION
ALUMINIUM ALLOYS
CHROMIUM ALLOYS
COMPUTER CODES
COMPUTERIZED SIMULATION
ELASTICITY
FIBERS
FINITE ELEMENT METHOD
MATRIX MATERIALS
MECHANICS
NIOBIUM ALLOYS
SILICON CARBIDES
TIN ALLOYS
TITANIUM ALLOYS
VANADIUM ALLOYS
ALLOYS
CARBIDES
CARBON COMPOUNDS
EXPANSION
MATERIALS
MECHANICAL PROPERTIES
NUMERICAL SOLUTION
SILICON COMPOUNDS
SIMULATION
TENSILE PROPERTIES
360603* - Materials- Properties