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Unformatted text preview: shared between two strongly electroPoisson’s ratio
) is always different from their the of negative charge
aluminum alloys as well as magnetic induction B, tocenter magnetic ﬁeld strength H.dipole bonds strain divided by the longitudinal
negative atoms such der Waals bonds. One especially important type of
are generally stronger than van as N, O, F, or Cl.
permittivity bond is the hydrogen bond, which occurs whenever a hydrogen atom polarization Separation of pos
permanent dipole See dielectric constant.
hydrogen embrittlement A family such as N, O, F, or
can be shared between two strongly electronegative atomsof degradation Cl. The
Petch-Hall is the strongest type ofthe high bond, but it is still signiﬁcantly weaker charge in a material, usually by a
ess of manufacturing lamhydrogen bond equation
mechanisms relatedEquation that provides the H in BCC
to secondary diffusivity of
than a primary bond. Hydrogen bonds hold the and the in a sheet of paper
relationshipthat results ingrain size wood ﬁbers yield stress. together. vector sum of all the dipoles in a
between the a decrease in ductility.
eets of resin-impregnated
The yield stress increases with decreasing grain size
ach other by hand in a
volume is the polarization.
hypereutectic An alloy whose
according δ to the Petch-Hall Hequation. composition is greater polycrystalline Describing a so
d cured to form the
than the eutectic composition.
phase A homogeneous portion ofH matter bounded by aH
joined crystals or grains.
hypereutectoid mechanicallywhose composition other
An alloy separate from any is greater
surface so that it is
hich a thick layer of hard
polymer Engineering material
portion. the eutectoid composition.
urface of the workpiece by
hypoeutectic A An alloy whose composition is less than H usually have either a linear (chain
graphical representation showing the
the eutectic present for a given composition as a
phase or phases...
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