This force discontinuous ber with a high elastic

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Unformatted text preview: ntinuously the diamagnetic A class of magnetic m from one end of the component to the other. If the fiber length is significantly less and component dimensions, then the material their separation inversely related to the square of is known as a discontinuous fiber- internal field is antiparallel to the the than the distance. This force discontinuous fiber with a high elastic modulus is embedreinforced composite. When apulls the species closer together if These materials show a weak respons ded they have opposite charge and pushes them apart in the fiber direction, in a low-modulus material and the resulting composite is loaded if they magnetic fields. the fibers carry a higher load than does the matrix. This is the principle of fiber strenghaveThere are, however,same sign. charges of the several conditions that must be met in order to achieve bonding A process by which an die thening. maximum strengthening of the composite from the fibers.formed covalent bond A type of primary bond One requirement is that the chip is bonded to the housing of an el fiber length exceed some critical (minimum) value. when their average between two electronegative elements dielectric constant Ability of a ma Figure 14.3–1a shows an isolated fiber embedded in a matrix in the unloaded state. Let number the fiber be f and that of the matrix be Em . If a equal to 4. the modulus ofof valenceEelectrons is greater than ornormal stress is applied charge when subject to an electric fiel to the composite, the matrix and fiberdeformation thatshown in Figure 14.3–1b. The creep Time-dependent will change shape as occurs at constant normalized to that of vacuum applied stress generates both normal and shear stresses in the fiber as shown in Figrelatively high temperatures and low stresses. dielectric constant. Also called permi ure 14.3–1c. Note that the types of stress present (shear and/or normal stress) and the crevice corrosion stress magnitude vary along theA highly localized tensile stress in the fiber increases length of the fiber. The form of corrosion dielectric strength The maximum from zero at the ends to a maximum value in the central region. The shear stress (usually) involving oxygen concentration gradients in strength that a material can withstand distribution is nearly the mirror image of the tensile stress state. The fiber length required regions where the flow of valueelectrolyte is limited.of factors including the is determined by a number for the normal stress to reach its peak diffraction A specific interaction o the critical fiberand the spatial arrangement of fiber within the matrix. Optimum ratio Em Ef 0.5 length The minimum fibers materials. Diffraction appears as refle strengthening requires that the fibers be long enough that the stress developed within them length-to-diameter ratio for load to be effectively planes and is governed by Bragg’s law is significantly larger than the nominal stress on the composite. If the fibers are too short, transferred to the strong fibers in a discontinuous carrying its capacity fiber then the normal stress that they carry at the time the composite is diffusion bonding A process by wh loadcomposite. will be well below their ultimate tensile...
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