Figure 1437 arrangement direction per unit a

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Unformatted text preview: g at display a ty values ;;; ;; ;;;; ;;;;; ;;;;; ; ;;; ;; ;;;;;;;;;;;; ;;;;; ;; ;; ; ;; ; ; ;;;;; ;;;;;;; ; ; ;;;;; ;;;; ; ; ; ; ; ;;;;; ; ; ;;; ;; ; ;;; ; ;;;;;; ;; ; ; ;;;; ; ; ;; ;; ; ; on which atoms or ions are placed to form a crystal. lattice point One position in the three-dimensional pattern that forms a crystal. One or 0°space-filling repeating 0° 0° 0°more atoms or ions are° placed at each lattice 90° 90 point. 0° +45° 0° An equation that enables one to90calculate the 0°lever rule –45° ° 0°relative amounts of two phases present in a two-phase –45° 90° 0° +45 0° mixture in terms of the° compositions of the alloy and the 0° 90° 90° 0°phases present. 0° 0° line compound A compound whose composition is independent of temperature. linearnidirectional density The(b)number of atoms centered on a(c) 0/90 (a) U Cross-plied quasi-isotropic 0/90/± 45 crystallographic of fibers in laminate composites: length. FIGURE 14.3–7 Arrangement direction per unit (a) unidirectional, (b) cross-plied, transversely isotropic containing fibers in 0 , 90 , and 45 directions, and (c) two-directional composite with fibers in 0 and 90 directions. liquid crystal An anisotropic fluid, usually a melt or solution characterized by molecular alignment. | | e-Text Main Menu | Textbook Table of Contents liquid metal embrittlement A degradation mechanism in which a liquid metal preferentially attacks the grain boundaries in a solid. liquidus The temperature at which a liquid begins to freeze during equilibrium cooling conditions. long-range order Existence of a regular repeating arrangement of atoms, ions, or molecules within a crystalline region of a material. v t are defined crystals are ;; ; ;;;; ;; ;;; ;;;;; plete oprocessor. of mobile or surfaces. with i, Ni3 Al, As mentioned previously, unidirectional composites have all their fibers oriented in a single direction. Figure 14.3–6 shows the variousof reactions and the kinetics The study of the rate geometric arrangements possible in the plane perpendicular to the fiber direction, called the transverse plane. These arrangements factors that affect or hexagonal. A hexagonal influence the same can be rectangular, square, them, including thefiber array has of timenearestneighbor distance between fiber centers along three directions in the transverse plane. on phase transformations. Because of this symmetry, these composites behave roughly like isotropic materials in the transverse planecompositestransversely isotropic. made from stacking design laminate and are termed Composites They are preferred by many engineers because their analysis is considerably simplified. Regardless of the fiber archiseveral laminae in a predetermined sequence of fiber tecture, however, the properties of unidirectional composites in the transverse plane are orientation. vastly inferior to those in the fiber direction. Therefore, these composites are unsuitable for applications involving multiaxial (multidirectional) loading. Larsen-Miller parameter to have fibers arranged al...
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This note was uploaded on 02/25/2013 for the course PHYS 2202 taught by Professor Sowell during the Spring '10 term at Georgia Tech.

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