Unformatted text preview: strength H A mea
in which theshows that in the matrix are consideredFtoand Ac Af Am .
Figurecomposition. and this loading condition, Fc
external magnetic ﬁeld. by wh
Since isostrain result is stress. It is in the analysis of composites of themachining
F A, identical
subjected to the An assumption the result of a load
removed by plastic shearing.
being applied the ﬁber and the the ﬁbers. considered to be
magnetic induction B A measure
in which perpendicular to matrix are
magnetic domains Microsc
Therefore, when the load is perpendicular to the ﬁbers,is the result are a
magnetism resulting from a given ex
subjected to identical strain levels. It we have what of
isotactic Conﬁguration of a vinyl polymer established known as
isostress conditions. Combining the previous two equations gives:
ferromagnetic crystal in which
load being applied parallel to the ﬁbers.
during polymerization corresponding to all side groups
dipoles are aligned
positioned Vf the same side of the backbone. of composites magnetic susceptibility withToneco
isostress Anmassumption in the analysis
magnetic ﬁeld strength H
isotropic Characterized by properties that are
tionality that relates the magnetizatio
in which the ﬁber and the matrix are considered to be
1 E and substituting into the previous equation gives:
of the H.
independent ofto identical stress. It is theyresult of a load
ﬁeld strengthexternal magnetic ﬁeld.
subjected the direction in which the are measured.
being applied perpendicular to the ﬁbers.
magnetic induction B A m
Ect Ef Em
magnetism resulting from a gi
isotactic Conﬁguration of a vinyl polymer established V
Ect is known as the transverse, or isostress, composite modulus. Since Ef
Em, and f
during polymerization corresponding to all little groups
Vm , we ﬁnd Vf Ef f Vm Em . Hence, ﬁber modulus has relatively side inﬂuence on Ect .
If, as shown in Figure 14.5–3, the load is neither parallel nor perpendicular to the ﬁber
positioned on the same side of the backbone.
direction but instead forms an angle with the ﬁbers, the composite’s elastic modulus, Ec ,
tionality that relates the magne
with , as shown in Figure 14.5–4. by properties that are
independent of the direction in which they are measured.
ﬁeld strength H.
....................................................................................................................................... | e-Text Main Menu | Textbook Table of Contents pg599 [R] G1 7-27060 / IRWIN / Schaffer iq Chapter 14
Fiber Matrix 13.01.98 plm QC1 rps MP Composite Materials 599 y ≡ (transverse
direction x ≡ Fiber direction
(longitudinal direction) FIGURE 14.5–3 A unidirectional composite system with the x axis oriented along the ﬁber axis, y axis in the
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