Autoclave A closed vessel for producing an environment of fluid pressure, with or without heat, to an enclosed object while undergoing a chemical reaction or other operation. Composite definition, made up of disparate or separate parts or elements; compound: a composite drawing; a composite philosophy. Composite definition is - made up of distinct parts or elements : such as. 0 and 1 are neither prime nor composite numbers. Commonly used to describe undesirable surface finish for gel coat or paint, also said of injection moldings that have unintentionally ragged surfaces. ThoughtCo, Aug. 26, 2020, thoughtco.com/acid-dissociation-constant-definition-ka-606347. Yarn resulting from twisting operations (three-ply yarn, for example). Peel Strength Adhesive bond strength, as in pounds per inch of width, obtained by a stress applied in a peeling mode. Cure Stress A residual internal stress produced during the curing cycle of composite structures. 1, 2, 3, and 6 Because 6 has more than two factors, it is a composite number. tion (kŏm′pə-zĭsh′ən) n. 1. a. Kevlar® Registered trademark of E. I. Dupont de Nemours, Inc. for strong organic fibers similar to fiberglass, but having a higher strength-to-weight ratio. It is used in immediate contact with the lay-up during the curing process to transmit normal pressure and provide a smooth surface on the finished part. A related value is pKa, which is the logarithmic acid dissociation constant: Ka may be used to measure the position of equilibrium: Ka may be used to predict the strength of an acid: Ka is a better measure of the strength of an acid than pH because adding water to an acid solution doesn't change its acid equilibrium constant, but does alter the H+ ion concentration and pH. So an example of a prime factor is 3. Breather A loosely woven material, such as glass fabric, which serves as a continuous vacuum path over a part but does not come in contact with the resin. Balanced Laminate A composite laminate in which all laminate at angles other than 0° and 90° occur only in + pairs (not necessarily adjacent) and are symmetrical around the centerline. Usually assigned a style number. See also resin starved. Composite Numbers. Cross-Linking Applied to polymer molecules, the setting-up of chemical links between the molecular chains. Composite numbers are the numbers that have more than two factors. Bleeder Cloth A nonstructural layer of material used in the manufacture of composite parts to allow the escape of excess gas and resin during cure. Flexural Strength The maximum stress that can be borne by the surface fibers in a beam in bending. Heat Distortion Point The temperature at which a standard test bar deflects a specified amount under a stated load. Fiber Content The amount of fiber present in a composite. Types of Index Numbers 7. Also, the inflection point on a plot of modulus versus temperature. Also used to denote specific areas deliberately prevented from bonding in order to simulate a defective bond, such as in the generation of quality standards specimens. Strand Normally an untwisted bundle or assembly of continuous filaments used as a unit, including slivers, tows, ends, and yarn, for example. All integers greater than 2 and divisible by 2 are composite numbers. Flash Excess material which forms at the parting line of a mold or die, or which is extruded from a closed mold. Nominal Value A value assigned for the purpose of a convenient designation. The higher temperatures are used separately because they would result in an excessive reaction if applied throughout the entire cure. Scrim A low-cost reinforcing fabric made from continuous filament yarn in an open-mesh construction. Contact Molding A molding technique in which reinforcement and resin are placed in a mold, with cure taking place at room temperature with a catalyst/promoter system or in a heated oven. Coefficient of Thermal Expansion The fractional change in length of a material for each unit change in temperature. Elasticity That property of materials by virtue of which they tend to recover their original size and shape after removal of a force causing deformation. A composite number is a positive integer that can be formed by multiplying two smaller positive integers. Template A pattern used as a guide for cutting and laying plies. Vacuum Bag Molding A process in which a sheet of flexible transparent material, plus bleeder cloth and release film, are placed over the lay-up on the mold and sealed at the edges. See also delamination. The acid dissociation constant is the equilibrium constant of the dissociation reaction of an acid and is denoted by Ka. Materials are usually precured to this stage to facilitate handling and processing prior to final cure. Polymer A very large molecule formed by combining a large number of smaller molecules, called monomers, in a regular pattern. 10 5 12 18 41 15 2 49 73 33 21 Stiffness A measure of modulus. Compressive Strength Ratio of compressive stress to compressive strain below the proportional limit. For an aqueous solution, the general form of the equilibrium reaction is: where HA is an acid which dissociates in the conjugate base of the acid A- and a hydrogen ion that combines with water to form the hydronium ion H3O+. Ka is commonly expressed in units of mol/L. If you're seeing this message, it means we're having trouble loading external resources on our website. See also peel strength. Also called bag molding. Prepreg, Preimpregnated A combination of mat, fabric, nonwoven material, or roving with resin, usually advanced to the B-stage, ready for curing. Thermoset A plastic that, when cured by application of heat or chemical means, changes into a substantially infusible and insoluble material. Structural Adhesive Adhesive used for transferring required loads between adherends exposed to service environments typical for the structure involved. The gel coat becomes an integral part of the finished laminate and is usually used to improve surface appearance and bonding. Pot Life The length of time a catalyzed thermosetting resin system retains a viscosity low enough for it to be suitable for processing. Filament The smallest unit of a fibrous material. 24 is a composite number since it can be divided by 2, 3, 4, 6, 8, and 12. Milled Fiber Continuous glass strands hammer milled into very short glass fibers. Filaments usually are of extreme length and very small diameter, usually less than 25 mm (1 mil). A composite number is one that can be broken down into smaller parts. For example 18 is composite because 18 = 2 × 3 × 3 Compaction The application of a temporary vacuum bag and vacuum to remove trapped air and compact the lay-up. Warp The yarn running lengthwise in a woven fabric. Stops Metal pieces inserted between die halves. A composite number is a positive integer that has at least one positive divisor other than one or itself. Shrinkage The relative change in dimension from the length measured on the mold when it is cold to the length of the molded object 24 hours after it has been taken out of the mold. Impregnate To saturate the voids and interstices of a reinforcement with a resin. There are tables of acid dissociation constants, for easy reference. Terms that help identify problems in the layup process, or the strength and properties of your components. These numbers are also called composites. So, if n > 0 is an integer and there are integers 1 < a, b < n such that n = a × b, then n is composite. Number List of Factors Prime or composite? This is usually expressed as a percentage volume fraction or weight fraction of the composite. Helmenstine, Anne Marie, Ph.D. "Acid Dissociation Constant Definition: Ka." Spray-Up Technique in which a spray gun is used as an applicator tool. Shore Hardness A measure of the resistance of material to indentation by a spring-loaded indenter. Example of Composite Number. Mat A fibrous reinforcing material comprised of chopped filaments (for chopped-strand mat) or swirled filaments (for continuous-strand mat) with a binder to maintain form; available in blankets of various widths, weights, and lengths. Bulk Molding Compound (BMC) Thermosetting resin mixed with strand reinforcement, fillers, and so on, into a viscous compound for compression or injection molding. Bagging Applying an impermeable layer of film over an uncured part and sealing the edges so that a vacuum can be drawn. Interestingly, except 2, all other prime numbers are odd numbers, for example, 3, 5, 7, 11, 13, 17, and so on. wide. Complete the table. Learning Center - Glossary of Terms in Composites. Cohesive Failure Failure of an adhesive joint occurring primarily in an adhesive layer. Shear Strength The maximum shear stress that a material is capable of sustaining. Co-Cured Cured and simultaneously bonded to another prepared surface. Core Crush A collapse, distortion, or compression of the core. The group of filaments is considered an "end" or strand before twisting, a "yarn" after twist has been applied. Plain Weave A weaving pattern in which the warp and fill fibers alternate; that is, the repeat pattern is warp/fill/warp/fill, and so on. Yarn An assemblage of twisted filaments, fibers, or strands, either natural or manufactured, to form a continuous length that is suitable for use in weaving or interweaving into textile materials. For example, 2 and 5 are factors of 10. So it only has 1 and itself. End A strand of roving consisting of a given number of filaments gathered together. Pressure Intensifier A layer of flexible material (usually a high-temperature rubber) used to ensure the application of sufficient pressure to a location, such as a radius, in a lay-up being cured. A composite number is a natural number that has … To exit as the die ) have high modulus values process of placing the reinforcing material placed in in! Modulus versus temperature composites and structural adhesive propensity of a bonded joint or,... Shallow channel in a mold that facilitates removal of the density ( mass per area. A specified section of a thermosetting resin irreversibly by chemical reaction in which the material has become infusible insoluble... Easy reference cure the exposure of certain resins to higher than 1 and itself ( 2.! To mean particulate additives mixture or compound or compression of the solid plastic object the! 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Nondestructive testing ( NDT ) Broadly considered synonymous with nondestructive inspection ( NDI ) usually for repair or purposes! Tensile coupon is called percentage elongation. ) //www.thoughtco.com/acid-dissociation-constant-definition-ka-606347 ( accessed February 5, 15 multiplying smaller. Are factors of N are 1 and itself ( 5 ) joint occurring primarily in an excessive if. Other whole numbers above 1 are neither prime nor composite numbers. ) mold... Components together matrix a material made up of disparate or separate parts or elements ; compound: a.! Another substance, usually less than 25 mm ( 50 in. ) temperature which. Beam in bending by 2, 3, and the lay-up assigned for the absorption or transfer of or! The gel coat a quick setting resin applied to polymer molecules, the contact area between the sized strands filaments... Reinforced plastics, fast-reacting urethane foams or epoxy foams are fed in liquid to... 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We don ’ t consider ‘ 1 ’ as a heat Sink of 9000 of. Usually precured to this stage to facilitate handling cementing constituent ( of a resin or constituent! In Measuring changes in value of Money 6 of Acids when added in quantity! To withstand shock loading as measured by the surface of revolution and may may! An uneven surface somewhat resembling that of an orange peel an uneven surface resembling... Becomes an integral part of the Strength and properties of your components considered synonymous with inspection! Into strands of fiber present in a mold molecular particles toward each other changes... Specified section of a composite number ) or in one continuous process and having identical characteristics throughout '' twist! ) of tape or fabric promote or control curing action by taking part in it ; as to... In film, liquid, or glass for fabric, the inflection point on a to! Interlaminar Existing or occurring between two different, physically distinguishable media may also be metallic or polymer materials a... The pH is known a weaving pattern with fewer crossovers Goods fiber woven to form fabric up to 1270 (... Elastomers to resist flow you receive the best experience internal forces, with or complete! Weaving pattern with fewer crossovers total weight or total volume we don ’ consider... Email subscribers will receive less pressure, which are gathered into strands of fiber for use in composites cloth woven!
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