Zusammenfassung der Ressource
COMPOSITE MATERIALS 1
- combination of two or more materials
that results in better properties than
those on the individual components
use alone.
- It's properties depend
- Properties of the matrix and the
Reinforcement, Reinforcement
Content, Reinforcement Orientation,
Production Method.
- Classification
- The Shape of the constituent
- Fibrous Composites
- Fibers
- Continuos
- Discontinuos
- Aligned
- Disoriented
- Particulate Composites.
- Reinforcement
- Equiaxed Particles
- Structural Composites.
- Homogeneous materials +
Composites
- Sandwich Panels
and Laminates
- The Nature of the Constituent.
- Organic Matrix
- Low Density. Possibility of
obtaining Complicated Parts .
most commonly used today
- Metalic Matrix
- High thermal and electrical
conductivity - Not absorb
moisture - Greater wear
resistance
- Mineral Matrix
- resist high temperatures
- The Size of the Dispersed Phase.
- Microcomposites
- Micron 10^-6
- processing difficulty, we can
not obtain fibers or
laminates.
- Nanocomposites
- Nanometer 10^-9
- Molecular Level
- Interphase Union
- Mechanical Connection
- Roughness between the
two surfaces resulting in
the union
- Electrostatic bonding
- This type of bonding
occurs when one
surface is positive
and the other
negative charge .
- Chemical Union
- Surface reinforcement
has chemical groups
compatible with
chemical groups of the
parent
- Union by interdiffusion
- The surface of the
reinforcement and the
matrix polymer chains
have diffusing including
- Architecture of organic
matrix composites
- Reinforced plastics
- .They consist of matrices in
which fiber reinforcements
are introduced or particle
type
- Structural
composites
- Laminates and
joined by an
adhesive.
- Laminate Orinetation
- Unidireccional
- Bidireccional:
- Multidireccional
- Sandwich Material
- Honney Comb
- Organic Matrix
- Polymer
- Thermosetting
- Have covalent bonds formed on
crosslinking or curing reaction .
- They are easy to process
before curing, Tenacious,
more fragile than
thermoplastic.
- Unsaturated polyester
resins.vinyl ester resins.
phenolics. Epoxy.
- Thermoplastic
- Haven't permanent
connections between chains
- Difficult to process, High
molecular, Good
mechanical properties
- Polypropylene ( PP).
polyethylene terephthalate.
Polycarbonates
- Reinforcement
- The fibers are most
commonly used
reinforcement
- Fiberglass
- tensile strength / density - Good value
properties / cost - Dimensional stability -
Ease of fabrication - Good thermal
resistance
- Types
- D (dielectric)
- C (chemical)
- E (eléctrico)
- R (resistance)
- Carbon Fiber
- Planes of hexagonal rings of
carbon atoms covalently
linked . The junction between
planes is weak through Van
der Waals force .
- HM fibers ((High Modulus)
- HT Fibers (High Toughness)
- Polymeric fibers
- Kevlar
- Polyethylene fibers