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Ch1 Vocab (Askeland)
Vocabulary Study Guide for MEE312
16
Mechanical Engineering
Undergraduate 3
02/07/2015

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Term
Alloy
Definition
a metallic material that is obtained by chemical combinations of different elements, typically alloys have much better mechanical properties than pure metals
Term
Ceramics
Definition
a group of crystalline inorganic materials characterized by good strength, especially in compression and high melting temperatures, many have good electrical and thermal insulation behavior
Term
Composites
Definition
a group of materials formed from mixtures of metals, ceramics, or polymers in such a manner that unusual combinations of properties are obtained.
Term
Composition
Definition
the chemical makeup of a material
Term
Crystalline Material
Definition
a material comprised of one or many crystals, in each crystal atoms or ions show a long range periodic arrangement
Term
Elastomers
Definition
polymers that have a higly coiled structure that provides them with the ability to exhibit extreme elastic deformation
Term
Glass
Definition
an amorphous material derived from the molten state, typically, but not always based on silica
Term
Glass-Ceramics
Definition
a special class of materials obtained by forming a glass and then heat treating it to form small crystals.
Term
Grain Boundaries
Definition
regions between grains of a polycrystalline material
Term
Grains
Definition
crystals in a polycrystalline material
Term
Mechanical Properties
Definition
properties of a material, such as strength, that describe how well a material withstands applied forces, a materials response to an applied force, microstructure sensitve
Term
Physical Properties
Definition
describe characteristics such as color, elasticity, electrical or thermal conductivity, magnetism, etc. a material's response to an applied field, not microstructure sensitive
Term
Polycrystalline Material
Definition
a material comprised of many crystals (as opposed to a material comprised of just one crystal)
Term
Polymers
Definition
a group of materials normally obtained by joining organic molecules into giant molecular chains or networks, characterized by low strength, low melting temperatures and poor electrical conductivity
Term
Thermoplastics
Definition
a special group of polymers in which molecular chains are entangled, but not interconnected, they can easily be melted and formed into useful shapes, normally they have a chainline structure (eg polyethylene)
Term
Thermosets
Definition
a special group of polymers that decompose rather than melt upon heating, they are normally quite brittle due to a relatively rigid 3-D network structure (eg-polyurethane)
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