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macromechanics
Structural behavior of com-
posite laminates using the laminated plate theory.
The fiber and matrix within each ply are smeared
and no longer identifiable.
mat
A fibrous material for reinforced plastic
consisting of randomly oriented chopped fila-
ments, short fibers (with or without a carrier fab-
ric), or swirled filaments loosely held together
with a binder. Available in blankets of various
widths, weights and lengths. Also, a sheet
formed by filament winding a single-hoop ply of
fiber on a mandrel, cutting across its width and
laying out a flat sheet.
matrix
The essentially homogeneous resin or
polymer material in which the fiber system of a
composite is embedded. Both thermoplastic and
thermoset resins may be used, as well as metals,
moisture absorption
The pickup of water
vapor from air by a material. It relates only to
vapor withdrawn from the air by a material and
must be distinguished from water absorption,
which is the gain in weight due to the take-up of
water by immersion.
moisture content
The amount of moisture in
a material determined under prescribed condi-
tions and expressed as a percentage of the mass
of the moist specimen, that is, the mass of the
dry substance plus the moisture present.
mold
The cavity or matrix into or on which the
plastic composition is placed and from which it
takes form. To shape plastic parts or finished ar-
ticles by heat and pressure. The assembly of all
parts that function collectively in the molding
process.
mold-release agent
A lubricant, liquid or
powder (often silicone oils and waxes), used to
prevent the sticking of molded articles in the
cavity.
monomer
A single molecule that can react with
like or unlike molecules to form a polymer. The
smallest repeating structure of a polymer (mer).
For additional polymers, this represents the origi-
nal unpolymerized compound.
ceramics and glass.
mechanical adhesion
Adhesion between sur-
faces in which the adhesive holds the parts to-
gether by interlocking action.
mechanical properties
The properties of a
material, such as compressive or tensile strength,
and modulus, that are associated with elastic and
inelastic reaction when force is applied. The in-
dividual relationship between stress and strain.
mek peroxide (MEKP)
Abbreviation for
Methyl Ethyl Ketone Peroxide; a strong oxidiz-
ing agent (free radical source) commonly used as
the catalyst for polyesters in the FRP industry.
micromechanics
Calculation of the effective
ply properties as functions of the fiber and ma-
trix properties. Some numerical approaches also
provide the stress and strain within each constitu-
ent and those at the interface.
mil
The unit used in measuring the diameter of
glass fiber strands, wire, etc. (1 mil = 0.001
inch).
milled fiber
Continuous glass strands hammer
milled into very short glass fibers. Useful as in-
expensive filler or anticrazing reinforcing fillers
for adhesives.
modulus of elasticity
The ratio of stress or
load applied to the strain or deformation pro-
duced in a material that is elasticity deformed. If
a tensile strength of 2 ksi results in an elongation
of 1%, the modulus of elasticity is 2.0 ksi di-
vided by 0.01 or 200 ksi. Also called Young's
modulus.
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