Term
| What is the definition of a composite? |
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Definition
| A material that constitutes of two or more phases being a matrix and reinforcement |
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Term
| What are the types of reinforcement? |
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Definition
| Particulate, short fiber, long fiber |
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Term
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Definition
| may be of fixed or random size and shape. low aspect ratio |
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Term
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Definition
| high aspect ratio of fibers. Can be fixed lengths, and direction, or random. |
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Term
| Continous fiber. What are the types? |
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Definition
Fibers span large distances. Multidirectional or undirectional.
orientations: undirectional, biaxial, triaxial |
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Term
| What are common Matrix materals? |
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Definition
Polymers: epoxy, polyester, nylon,
ceramics
metals |
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Term
| What are common reinforcements? |
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Definition
Fibers: glass, carbon, kevlar, basalt,
Particulates: carbon, aluminium, sillica etc |
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Term
| What is a thermoplastic matrix? |
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Definition
| Linear or branched chains held together by crystallinity. |
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Term
| What is a thermoset matrix? |
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Definition
| Crosslinked chains, ideally forming a single molecule |
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Term
| What are particulate reinforcements used for? What purpose do they serve? |
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Definition
Additives
modify physical, chemical, or mechanical properties |
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Term
| Examples of particulate reinforcements. what properties does each add to composite? |
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Definition
-nano-clay (mechanical/physical)
-metallic particles (electrical, thermal, magnetic)
-elastomer (toughness)
-metallic nano-particles (thermal expansion) |
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Term
| Nano: What does Agglomeration refer to? |
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Definition
| atraction between nano particles |
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Term
| Nano: What does intercalation refer to? |
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Definition
| partial separation of nano particles |
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Term
| Nano: What does exfoliation refer to? |
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Definition
| complete separation of nano-particles from one another |
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Term
| Nano: What does dispersion refer to? |
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Definition
| consistent distribution of polymers throughout the polymer matrix |
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Term
| What properties does fiber reinforcement add to material? |
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Definition
-smaller defect treshhold
-greater bending limit
-polymer chain alignment |
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Term
| What purpose does the matrix add to fibers? |
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Definition
| it connects the fibers and help distribute load across many fibers |
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Term
| What is discontinous fiber refered to as? |
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Definition
| reinforced plastics. Have a critical minimum length |
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Term
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Definition
| Adds greatest contribution of properties |
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Term
| Properties of composites? |
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Definition
| Engineered materials leveraging properties of constituent materials while mitigating the disadvantages |
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Term
| Describe homogenity of composite materials |
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Definition
| homogenity on large scale while hetero on small scale |
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Term
| describe isotropic, anistropic, and orthotropic materials |
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Definition
iso: identical properties in any direction
-aniso: several
-ortho: 3 perpendicular planes of symatry |
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Term
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Definition
| solids, shells, sandwish structures |
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Term
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Definition
| solids, shells, sandwish structures |
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Term
| What are the 3 main composite processing teqniques? |
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Definition
| wet layup, prepreg, infusion molding |
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Term
| Different Infusion molding teqniques? |
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Definition
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Term
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Definition
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Term
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Definition
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Term
| Esplain the VARTM process |
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Definition
-single sided mold is filled with reinforcement
-flow aiding media is added above reinforcement
-plastic film is sealed to edges of mold
-air is vacumed out of the mold
-matrix resin is drawn in by vacuum |
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Term
| What does the rule of mixture say? (formula) |
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Definition
xc=(xf)(vf)+(xm)(vm)
v is rel volume to total |
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Term
| What type of composite process is best for the marine industry? |
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Definition
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Term
| What type of composite process is best for the aerospace industry? |
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Definition
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