Chapter 13: Composites Flashcards
The supposition, often valid, that new properties, better properties, better property combinations, and/or a higher level of properties can be fashioned by the judicious combination of two or more distinct materials.
Principle of Combined Action
The phase in a composite or two-phase alloy microstructure that is continuous or completely surrounds the other (or dispersed) phase.
Matrix Phase
For composites and some two-phase alloys, the discontinuous phase surrounded by the matrix phase
Dispersed Phase
The Upper bound of a large-particle composite’s modulus of elasticity is equal to ———.
- Em+ Ep
- EmVm + EpVp
- (EmVm)/((VmEp)+(VpEm))
EmVm+EpVp
A ferment is a group of composites that combines a ———and a ———.
- Metal, polymer
- Ceramic, metal
- Ceramic, polymer
Ceramic, Polymer
Small carbon black particles are used to reinforce modern rubber because carbon black has a———than reinforcing materials.
- higher tensile strength
- higher modulus of elasticity
- stronger adhesive bond
Stronger adhesive bond
A composite in which the dispersed phase is in the form of a fiber (I.e., a filament that has a large length-to-diameter ratio).
Fiber-reinforced Composite
The ratio of tensile strength to specific gravity for a material
Specific Strength
The ratio of elastic modulus to specific gravity for a material.
Specific Modulus (specific Stiffness)
A type of particle-reinforced composite in which particle-matrix interactions cannot be treated on atomic level; the particles reinforce the matrix phase
Large-Particle Composite
A means of strengthening materials in which very small particles (usually 0.1 um) of a hard, inert phase are uniformly dispersed within a load-bearing matrix phase.
Dispersion Strengthening
The properties of a multiphase alloy or composite material are a weighted average (usually on the basis of volume) of the properties of the individual constituents
Rule of Mixtures
A composite materials. The most common ferments are the cemented carbides, composed of an extremely hard ceramic bonded together by a ductile metal such as cobalt/Nickel
Cermet
A composite material consisting of aggregate particles bound together in a solid body by a cement
Concrete
Concrete that’s reinforced (or strengthened in tension) by the incorporation of steel rods, wires, or mesh
Reinforced Concrete
Concrete into which compressive stresses have been introduced using steel wires or rods.
Prestressed Concrete
The lengthwise dimension. For a rod or fiber, in the direction of the long axis
Longitudinal Direction
A direction that crosses (usually perpendicularly) the longitudinal or lengthwise direction
Transverse Direction
