Definitions /Dictionary/Glossary - nptel

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Acrylic Plastic: A thermoplastic polymer made by the polymerization of esters of acrylic acid and its derivatives. Activation: The chemical process of making a surface more receptive to bonding. Activator: See accelerator. Addition: A polymerization reaction in which no by-products are formed. Adherend: A body that is held to another body, usually by an adhesive. Addition Polymerization: Polymerization by a repeated addition process in which monomers are linked together to form a polymer without splitting off of water or other simple molecules. Additives: Ingredients mixed into resin to improve properties. Adhesion: The state in which two surfaces are held together at an interface by forces or interlocking action or both. Adhesion Failure: A rupture of an adhesive bond that appears to be a separation at the adhesive/adherend interface. Adhesion-to-core-Failure: It is a failure caused by adhesive not adhering to the core. Adhesionto-facing Failure- Failure caused by adhesive not adhering to facing. Adhesion Promoter: A coating applied to a substrate, before it is coated with an adhesive to improve the adhesion of the plastic Adhesive: A substance capable of holding two materials together by surface attachment. In the handbook, the term is used specifically to designate structural adhesives, those which produce attachments capable of transmitting significant structural loads. Adhesive Assembly: It is a group of materials or parts, including adhesive, that are placed together for bonding or that have been bonded together. Adhesive Bonding: A material joining process in which an adhesive, placed between facing surfaces, solidifies to bond the surface together. Adhesive Failure: Rupture of an adhesive bond such that the separation appears to be at the adhesive-adherend interface. Adhesive Film: It is a synthetic resin adhesive, with or without a film carrier fabric, usually of the thermosetting type, in the form of a thin film of resin, used under heat and pressure as an interleaf in the production of bonded Structures.
Adhesive Joint: It is the location at which two adherends or substrates are held together with a layer of adhesive. ADK: Notation used for the k-sample Anderson-Darling statistic, which is used to test the hypothesis that k batches have the same distribution. Adsorption: The adhesion of the molecules of gases, dissolved substances or liquids in more or less concentrated form, to the surfaces of solids or liquids with which they are in contact. Advanced Ceramics: These are the Ceramic materials that exhibit superior mechanical properties such as corrosion/oxidation resistance, or electrical, optical and/or magnetic properties. This term includes many monolithic ceramics as well as particulates, whiskers and fibre reinforced glass, glass-ceramics and ceramic-matrix composites. Advanced Composites: These are the Composite materials that are reinforced with continuous fibres having a modulus higher than that of fibre glass fibres. The term includes metal-matrix and ceramic-matrix composites as well as carbon-carbon composites. Aerodynamic Tailoring: It is the design of an aerodynamic surface whose strength and stiffness are matched to the aerodynamic loads that will be imposed upon it. Aging: The effect, on materials, of exposure to an environment for a period of time; the process of exposing materials to an environment for an interval of time. Air-Bubble-Void: Air entrapment within and between the plies of reinforcement; noninterconnected, spherical in shape. Air Dry: To cure at room temperature with the addition of catalyst but without the assistance of heat and pressure. Air-Inhibited Resin: A resin by which surface cures will be inhibited or stopped in the presence of air. Air Splice: The coupling between two roving doffs which is made by a jet of air entwining/snarling two strands together. The air splice is used instead of a knot. Air Vent: It is a small outlet, to prevent entrapment of gases. Aliquot: A small, representative portion of a larger sample. Alkyd Plastics: Plastics based on resins composed principally of polymeric esters, in which the recurring ester groups are an integral part of the main polymer chain, and in which ester groups occur in most cross links that may be present between chains. Alligatoring: Wrinkling of the gel coat film resembling alligator hide. It sucks.
Page 1: Definitions /Dictionary/Glossary Th
Page 5 and 6: Aramid: A manufactured fiber in whi
Page 7 and 8: Balanced Laminate: A composite lami
Page 9 and 10: 2 As a final step, recognizing that
Page 11 and 12: Blend: Made by mixing traditional p
Page 13 and 14: Bulk Molding Compound: Thermosettin
Page 15 and 16: Censoring: Data is right (left) cen
Page 17 and 18: Coin Test: Using a coin to tap a la
Page 19 and 20: where 1- α is called the confidenc
Page 21 and 22: Coupon: A specimen for a specific t
Page 23 and 24: Cycle: The complete, repeating sequ
Page 25 and 26: Diluent: Diluting (reducing or thin
Page 27 and 28: Ease of Rollout: The relative facil
Page 29 and 30: where ‘p’ is the distributed lo
Page 31 and 32: Felt: a fibrous material made up of
Page 33 and 34: Filler: A relatively inert material
Page 35 and 36: Foamed Plastic: Resins in sponge fo
Page 37 and 38: Glass Transition: The reversible ch
Page 39 and 40: Hoop Stress: It is a circumferentia
Page 41 and 42: Insert: An integral part of a plast
Page 43 and 44: Knitting: A method of constructing
Page 45 and 46: Lightning Strike Zones: Aircraft su
Page 47 and 48: Material Qualification: The procedu
Page 49 and 50: Modulus, Tangent: The ratio of chan
Page 51 and 52: applied force and includes all area
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Nonwoven Roving: Reinforcement comp
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Overlay Sheet: A non-woven fibrous
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Ply Schedule: Lay-up of individual
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Pregel: An unintentional extra laye
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etc., in woven or non-woven form. T
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Rule-Of-Mixtures: When combined, th
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Shrinkage: The relative change in d
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Standard Deviation: See Sample Stan
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Surfacing Agent: It is a material,
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Tolerance Limit: A lower (upper) co
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Variance: See Sample Variance. Veil
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Winding Pattern: The regularly recu
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Autoclave molding: A molding techni
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Composite: A material created from
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Fabric, non-woven: A material forme
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Mat: A fibrous reinforcing material
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Release agents: Materials that are
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Unbond: Area of a bonded surface in
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Addition Polymerization: Chemical r
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and in which flexural loads produce
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Braid/Braider: A narrow tubular or
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Cell: The vertical plane of doffs o
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Copolymer: A resin produced by copo
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Dielectric: A nonconductor of elect
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Exothermic Heat: Heat given off dur
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Flash: Portion of the charge that f
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Glass Transition: Reversible change
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Hydraulic Press: A press in which m
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Lay: In glass fiber, the spacing of
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Microcracking: Crack formed in comp
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Organic: Matter originating in plan
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Preform: Pre-shaped fibrous reinfor
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Roving Doff or "Doff": The final pr
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Soft Glass: A roving product whose
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Surfactant: Chemicals used to modif
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Thixotropic: The property of becomi
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Wet-Process: A process for forming
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Definitions /Dictionary/Glossary - nptel

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