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Tham khảo tài liệu 'volume 21 - composites part 17', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | off-axis laminate A laminate whose principal axis is oriented at an artQletfier than 0 or 90 with respect to a reference direction usually related to principal load or stress direction. offset modulus The ratio of the offset yield stress to the extension at the offset point. offset yield strength The stress at which the strain exceeds by a specific amount the offset an extension of the in approximately linear proportional portion of the stress-strain curve. It is expressed in force per I area. olefin A group of unsaturated hydrocarbons of the general formựl Chamed after the corresponding paraffins by the addition of ì-eneĩ or ịyleneĩ to the root for example ethylene propylene and pentene. open-cell foam Foamed or cellular material with cells that are generally interconnected. Closed cell refers to cells are not interconnected. orange peel An uneven surface somewhat resembling that of an orange peel said of injection moldings that t unintentionally ragged surfaces. organic Matter originating in plant or animal life or composed of chemicals of hydrocarbon origin eith natural or synthetic. orientation The alignment of the crystalline structure in polymeric materials in order to produce a highly align structure. Orientation can be accomplished by cold drawing or stretching in fabrication. oriented materials Materials particularly amorphous polymers and composites whose molecules and or macroconstitL are aligned in a specific way. Oriented materials are anisotropic. Orientation can generally be divi into two classes uniaxial and biaxial. orthotropic Having three mutually perpendicular planes of elastic symmetry. outgassing Release of solvents and moisture from composite parts under vacuum. Also occurs during the no curing process under vacuum. out time The time a prepreg is exposed to ambient temperature namely the total amount of time the prepr out of the freezer. The primary effects of out time are to decrease the drape and tack of the pre while also allowing it to .