Definitions /Dictionary/Glossary - nptel

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Low-Pressure Molding: The distribution of relatively uniform low pressure (200 psi or less) over a resin-bearing fibrous assembly of cellulose, glass, asbestos, or other material, with or without application of heat from an external source, to form a structure possessing definite physical properties. Lubricant: A material added to most sizing to improve the handling and processing properties of textile strands. Mandrel: The core tool around which resin-impregnated paper, fabric or fiber is wound to form pipes, tubes or structural shell shapes. Manipulator: Highly efficient system eliminating the need for a press screw driven frame structure that opens and closes the mold in a controlled line of draw to prevent tool damage. Mat: A fibrous material for reinforced plastic consisting of randomly oriented chopped filaments, short fibers (with or without a carrier fabric) or swirled filaments loosely held together with a binder. Mat Binder: Resin applied to glass fiber and cured during the manufacture of mat that holds fibers in place and maintains the mat’s shape. Matched Metal Molding: A reinforced plastics manufacturing process in which matching male and female metal molds are used (also called compression molding) to form the part with time, pressure and heat. Matrix: The resin component of a polymer composite. Both thermoplastic and thermoset resins may be used, as well as metals, ceramic and glasses. (Plural: matrices.) Mat Strength: The mat’s ability to resist being pulled apart under tension during impregnation and molding. Matchsticks: Strand-to-strand adhesion. A matchstick is a wide bundle that has 3 to 4 times as many filaments than the majority of bundles in the bed. Mechanical Properties: A material’s properties, such as compressive and tensile strength and modulus, those are associated with elastic and inelastic reaction when force is applied. These are individual relationship between stress and strain. Melamine: Thermoset resin. Metallic Fiber: Manufactured fiber composed of metal, plastic-coated metal, metal-coated plastic or core completely covered by metal. Microballoons: Microscopic bubbles of glass, ceramic or Phenolic, used as a filler or to create syntactic foam or putty mixtures.
Microcracking: Crack formed in composites when thermal stresses locally exceed the strength of the matrix. Micron: One micron = .001 millimeter = .00003937 inch. Mil: Unit used to measure the diameter of glass fiber strands (1 mil = 0.001 in.). Milled Fiber: Continuous glass strands hammer milled into very short glass fibers. It is useful as inexpensive filler or anti-crazing reinforcing filler for adhesives. M.I.T: see Multiple Insert Tooling MPG: see Mold Protection Guard Modulus, Initial: The slope of the initial straight portion of a stress strain or load-elongation curve. Modulus of Elasticity: How much a material can bend without losing its ability to return to its original physical properties. Moisture: The amount of volatiles on the glass expressed as a percentage of the total weight. Moisture Content: The amount of moisture in a material determined under prescribed conditions, 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. The tool used to fabricate the desired part shape. Molded Edge: It is an edge that is not physically altered after molding for use in final form, and particularly one that does not have fiber ends along its length. Molding: The forming of a polymer or composite into a solid mass of prescribed shape and size. Molding Compounds: Plastics available in a wide range of forms meeting specific processing requirements. Granules or pellets are popular forms. Molding Cycle: The period of time required for the complete sequence of operations on a molding press to produce one set of moldings. Molding Pressure: Pressure applied to the ram of an injection machine or compression or transfer press forcing softened plastic to completely fill mold cavities. Molding Pressure, Compression: Unit pressure applied to material in the mold. The area is calculated from the projected area taken at right angles to the direction of applied force and
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Definitions /Dictionary/Glossary Th
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Adhesive Joint: It is the location
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Aramid: A manufactured fiber in whi
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Balanced Laminate: A composite lami
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2 As a final step, recognizing that
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Blend: Made by mixing traditional p
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Bulk Molding Compound: Thermosettin
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Censoring: Data is right (left) cen
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Coin Test: Using a coin to tap a la
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where 1- α is called the confidenc
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Coupon: A specimen for a specific t
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Cycle: The complete, repeating sequ
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Diluent: Diluting (reducing or thin
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Ease of Rollout: The relative facil
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where ‘p’ is the distributed lo
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Felt: a fibrous material made up of
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Filler: A relatively inert material
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Foamed Plastic: Resins in sponge fo
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Glass Transition: The reversible ch
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Hoop Stress: It is a circumferentia
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Insert: An integral part of a plast
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Knitting: A method of constructing
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Lightning Strike Zones: Aircraft su
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Material Qualification: The procedu
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Modulus, Tangent: The ratio of chan
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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
Page 59 and 60: Pregel: An unintentional extra laye
Page 61 and 62: etc., in woven or non-woven form. T
Page 63 and 64: Rule-Of-Mixtures: When combined, th
Page 65 and 66: Shrinkage: The relative change in d
Page 67 and 68: Standard Deviation: See Sample Stan
Page 69 and 70: Surfacing Agent: It is a material,
Page 71 and 72: Tolerance Limit: A lower (upper) co
Page 73 and 74: Variance: See Sample Variance. Veil
Page 75 and 76: Winding Pattern: The regularly recu
Page 77 and 78: Autoclave molding: A molding techni
Page 79 and 80: Composite: A material created from
Page 81 and 82: Fabric, non-woven: A material forme
Page 83 and 84: Mat: A fibrous reinforcing material
Page 85 and 86: Release agents: Materials that are
Page 87 and 88: Unbond: Area of a bonded surface in
Page 89 and 90: Addition Polymerization: Chemical r
Page 91 and 92: and in which flexural loads produce
Page 93 and 94: Braid/Braider: A narrow tubular or
Page 95 and 96: Cell: The vertical plane of doffs o
Page 97 and 98: Copolymer: A resin produced by copo
Page 99 and 100: Dielectric: A nonconductor of elect
Page 101 and 102: Exothermic Heat: Heat given off dur
Page 103 and 104: Flash: Portion of the charge that f
Page 105 and 106: Glass Transition: Reversible change
Page 107 and 108: Hydraulic Press: A press in which m
Page 109: Lay: In glass fiber, the spacing of
Page 113 and 114: Organic: Matter originating in plan
Page 115 and 116: Preform: Pre-shaped fibrous reinfor
Page 117 and 118: Roving Doff or "Doff": The final pr
Page 119 and 120: Soft Glass: A roving product whose
Page 121 and 122: Surfactant: Chemicals used to modif
Page 123 and 124: Thixotropic: The property of becomi
Page 125: Wet-Process: A process for forming
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Definitions /Dictionary/Glossary - nptel

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