Definitions /Dictionary/Glossary - nptel

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Weibull Distribution (Two - Parameter): A probability distribution for which the probability that a randomly selected observation from this population lies between ‘a’ and ‘b’ (0 < a< b
Winding Pattern: The regularly recurring pattern of the filament winding after a certain number of mandrel revolutions. Winding: It is a process in which continuous material is applied under controlled tension to a form in a predetermined geometric relationship to make a structure. Discussion: A matrix material to bind the fibers together may be added before, during or after winding. Filament winding is the most common type. Work Life: The period during which a compound, after mixing with a catalyst, solvent, or other compounding ingredient, remains suitable for its intended use. Woven Fabric Composite: It is a major form of advanced composites in which the fiber constituent consists of woven fabric. A woven fabric composite normally is a laminate comprised of a number of laminae, each of which consists of one layer of fabric embedded in the selected matrix material. Individual fabric laminae are directionally oriented and combined into specific multi-axial laminates for application to specific envelopes of strength and stiffness requirements. Woven Roving: It is a heavy glass fiber fabric made by the weaving of roving. Woven Roving Fabric: Heavy fabrics woven from continuous filament in roving form. They drape well, are quickly impregnated, and intermediate in price between mats and yarn cloths. Woven Tape: Tape of various thicknesses woven from continuous filament yarns. Wrinkle: An imperfection in the surface of a laminate that looks like a crease in one of the outer layers; it occurs in a vacuum bag molding due to improper placement of the bag. X-Axis: In composite laminates, an axis in the plane of the laminate which is used as the 0 degree reference for designating the angle of a lamina. X-Y Plane: In composite laminates, the reference plane parallel to the plane of the laminate. Y-Axis: In composite laminates, the axis in the plane of the laminate which is perpendicular to the x-axis. Yarn: A generic term for strands or bundles of continuous filaments or fibers, usually twisted and suitable for making textile fabric. Yarn, Plied: Yarns made by collecting two or more single yarns together. Normally, the yarns are twisted together though sometimes they are collected without twist. Yield Strength: The stress at which a material exhibits a specified limiting deviation from the proportionality of stress to strain; the lowest stress at which a material undergoes plastic deformation. Below this stress, the material is elastic; above it, viscous.
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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
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
Page 53 and 54: Nonwoven Roving: Reinforcement comp
Page 55 and 56: Overlay Sheet: A non-woven fibrous
Page 57 and 58: 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: Variance: See Sample Variance. Veil
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 and 110: Lay: In glass fiber, the spacing of
Page 111 and 112: Microcracking: Crack formed in comp
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
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Wet-Process: A process for forming
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Definitions /Dictionary/Glossary - nptel

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