04 area normal to the applied force temporary dipole

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Unformatted text preview: per unit area associated with in one portion of the crystal, a tilt is created. internal or external surfaces. It has units of energy/area, which is equivalent to force/length. time-dependent deformation Deformation that occurs 0.6 5 syndiotactic Configuration of a vinyl polymer × 105 as a function of time, independent of whether such 0 10 2 Number of cycles established during polymerization corresponding to side deformation is elastic or plastic. FIGURE 14.5–8 Normalized elastic modulus as a function of fatigue cyclesthe glass fiber–polymer matrix comin a backbone. groups positioned on alternating sides of transference numbers A set of values ranging from 0 posite. (Source: K. K. Chawla, Composites Material Science and Engineering, 1987, Springer-Verlag, New York. temperature coefficient York resistivity The materials of Publishers.) to 1 that describe the relative contributions of anions, Reprinted with permission of Springer-Verlag, New property that describes the magnitude of the change in cations, electrons, and holes in the transport of electrical the resistivity of a conductor resulting from a change in charge through a solid. temperature. 1.0 true strain t The natural logarithm of the tempered martensite The result of heat-treating a instantaneous length divided by the original length. 0.8 microstructure containing martensite. Tempered Numerically, it is essentially equivalent to the martensite consists of a fine dispersion of Fe3C particles engineering strain for strains up to about 0.1. E/ 0.6 E 0= in an -ferrite matrix. The ductility and toughness of a 0. true stress t The force divided by the instantaneous 95 martensitic microstructure are enhanced by tempering. 0.4 area normal to the applied force. temporary dipole An atom or molecule in which the twin A portion of a crystal in which all of the atoms 0.2 spatial center of positive charge is momentarily different are in mirror-image positions compared with atoms in from the center of negative charge. 0 the bulk of the crystal. tetrahedral 0site 10 A 102 103 in a crystal 106 107 by four position 104 105 defined twist boundary A boundary that is composed of a Number of cycles, N nearest neighbors. grid of screw dislocations of like sign on the same plane. FIGURE 14.5–9 Number of fatigue cycles required to achieve different fractions of stiffness reduction as a function thermal capacitance The extrinsic counterpart of of applied maximum fatigue stress. (Source: K. K. Chawla, Composites Material Science and Engineering, 1987, As a result of the displacements around the grid, a twist specific heat obtained by multiplying specific heat by Springer-Verlag, New York. Reprinted with permission of Springer-Verlag, New York Publishers.) the is created. mass of the object under investigation. ultimate tensile strength uts The maximum value of fails. The elastic modulus of the composite decreases continuously as fatigue damage thermal conductivity The constant of proportionality accumulates and is frequently used as an...
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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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