Influence of engineered interfaces on residual stresses and mechanical response in metal matrix composites
Because of the inherent coefficient of thermal expansion (CTE) mismatch between fiber and matrix within metal and intermetallic matrix composite systems, high residual stresses can develop under various thermal loading conditions. These conditions include cooling from processing temperature to room temperature as well as subsequent thermal cycling. As a result of these stresses, within certain composite systems, radial, circumferential, and/or longitudinal cracks have been observed to form at the fiber matrix interface region. A number of potential solutions for reducing this thermally induced residual stress field have been proposed recently. Examples of some potential solutions are high CTE fibers, fiber preheating, thermal anneal treatments, and an engineered interface. Here the focus is on designing an interface (by using a compensating/compliant layer concept) to reduce or eliminate the thermal residual stress field and, therefore, the initiation and propagation of cracks developed during thermal loading. Furthermore, the impact of the engineered interface on the composite's mechanical response when subjected to isothermal mechanical load histories is examined.
- Research Organization:
- National Aeronautics and Space Administration, Cleveland, OH (United States). Lewis Research Center
- OSTI ID:
- 7207198
- Report Number(s):
- N-92-23195; NASA-TM-105438; E-6866; NAS-1.15:105438; CONF-9205219-
- Resource Relation:
- Conference: 4. international conference on composite interfaces, Cleveland, OH (United States), 26-29 May 1992; Other Information: Sponsored by Case Western Reserve Univ
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
COMPOSITE MATERIALS
INTERFACES
MEETINGS
CRACK PROPAGATION
FINITE ELEMENT METHOD
INTERMETALLIC COMPOUNDS
MATRIX MATERIALS
REINFORCED MATERIALS
RESIDUAL STRESSES
STRESS ANALYSIS
TEMPERATURE EFFECTS
THERMAL CYCLING
THERMAL EXPANSION
THERMAL STRESSES
ALLOYS
EXPANSION
MATERIALS
NUMERICAL SOLUTION
STRESSES
360600* - Other Materials