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--
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360603* -- Materials-- Properties
ALLOYS
ALUMINIUM ALLOYS
CARBIDES
CARBON COMPOUNDS
CHROMIUM ALLOYS
COMPOSITE MATERIALS
COMPUTER CODES
COMPUTERIZED SIMULATION
ELASTICITY
EXPANSION
FIBERS
FINITE ELEMENT METHOD
MATERIALS
MATRIX MATERIALS
MECHANICAL PROPERTIES
MECHANICS
NIOBIUM ALLOYS
NUMERICAL SOLUTION
SILICON CARBIDES
SILICON COMPOUNDS
SIMULATION
STRESS ANALYSIS
TENSILE PROPERTIES
THERMAL EXPANSION
TIN ALLOYS
TITANIUM ALLOYS
VANADIUM ALLOYS