| 4. Off Axis Properties |
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The anisotropy of carbon fiber reinforced composite(CFRP) is very
large. In practice, cross-ply laminates are commonly used. So, it is important
to pay attention not only to axial (tensile) properties, but also to off-axial
properties.
In case of carbon fiber and CFRP production, optimization of off-axial
properties can be designed by carbon fiber surface status and carbon fiber-resign
compatibility.
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Fig. 4-1
Anisotropy
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Recently, attention to off-axial behavior has become important to ensure
good balance of composite performance. In this regard we consider parameters
such as ; 90°strength, EDS (edge delamination), OHC (open hole compression),
and CAI (compression after impact) are key criteria (Table 4-1). |
Fig. 4-2 Concept of
load direction
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Table
4-1 Off-axial
characteristics
 note) conventional epoxy 350°F
curable (MY-720/DDS
type)
toughened epoxy 350°F
curable (TORAY #3900-2)
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