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Unformatted text preview: o-brittle breaking. This temperature (DBTT) The
the number of repeated load appli
example, the glass at whichwindow is brittle, an ionic solid, in a
of metals. Onthe other hand, as illustrated in Figure 2.4–5a, in while the each ion particles embedded in another material, cal
temperature in a car 50% of the fracture surface
is surroundedplastic bumper is not. More slip may lead tobrittle
metalCharpy specimen shows crystallographic like charges moving matrix. energy gap See band gap.
or by oppositely charged ions. Thus, ionic precisely, facets.
into adjacent positions, causing coulombic repulsion (see Figure 2.4–5b). This makes
T by whic
engineering strain processhe chang
materials more difﬁcult to achieve, and the material responds by breaking. This is the
slipping Alternatively,lowis the temperature corresponding toone compression molding
much exhibit a it failure strain.
of the reasons why ceramics and oxide glasses fracture easily. Such behavior is known as materialimen or component divided by the
is shaped by heating and squeezing
Burgers circuitbetween the drawn and upper shelf energies in a
A circuit lower around a dislocation
desired shape between two platens that actf
engineering strain at fracture
through defect-free material that would normally close if
there edge dislocation inside of the circuit. formed
were no dislocation A dislocation that is
strain polarization A mechanism
concentration when failure occurs.
to low ion
Burgers vector b – by+ the insertion of an the end to the
(ﬁguratively) The vector that joins + extra half– plane into the corrosion rate is reduced due The load
rates within the electrolyte. normal to the
start of –the +Burgers perfect region of a crystal. is an
an otherwise+ circuit. The Burgers vector
invariant property –of a dislocation. + – + – +
concrete A mixture (or aggregate compow
epitaxial growth A process in
effective +penetration distance The distance at which
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