SAMPE Journal - July/August 2016 - 12

Feature Article

Figure 6. CYCOM 5320-1 typical
production part cure cycle.

Such applications of ultra-high modulus fiber
based prepreg may require the use of a cure cycle
with lower than customary ramp rates and a limit
on the maximum postcure temperature in order to
reduce residual stress levels and the associated
tendency to microcrack after thermal cycling. For

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12

the example shown in Figure 7, a cure cycle with
an initial cure temperature of 121°C and maximum
postcure temperature of 160°C was found to be
effective in eliminating microcracking after thermal
cycling for MTM ®45-1/HM63-145gsm-32%RW
unidirectional tape rather than the standard cure
cycle with a maximum postcure temperature of
177°C. The modified cure cycle also used a slow
ramp rate of 10°C/hour between 121°C and 177°C.
The development of modified processes for materials
based on these types of high modulus fibers is being
considered as the subject of a future paper.
Honeycomb Sandwich Structure - Prepreg and Adhesive
Combinations
The manufacture of VBO honeycomb sandwich
structure involves more variables than the
manufacture of monolithic prepreg parts. Such
variables include the core material and weight, core
cell size, whether a core cavity venting scheme
is used and if so what, film adhesive type and
weight, film adhesive foaming etc. A detailed and
comprehensive discussion of this topic is beyond the
scope of this paper, however the use of two materials
with differing cure characteristics in combination - a
prepreg and a film adhesive - is worthy of discussion
in terms of basic cure cycle selection considerations.
CYCOM 5320-1 prepreg is commonly used with
FM®309-1 film adhesive to produce honeycomb
sandwich parts and an in-tool cure cycle such
as that shown in Figure 6 has been successfully
used. If however it were desired to perform an
initial cure at 121°C/250°F, demold and postcure
freestanding to 177°C/350°F as shown in Figure 5,
SAMPE Journal, Volume 52, No. 4, July/August 2016


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Table of Contents for the Digital Edition of SAMPE Journal - July/August 2016

Contents
SAMPE Journal - July/August 2016 - Cover1
SAMPE Journal - July/August 2016 - Cover2
SAMPE Journal - July/August 2016 - Contents
SAMPE Journal - July/August 2016 - 2
SAMPE Journal - July/August 2016 - 3
SAMPE Journal - July/August 2016 - 4
SAMPE Journal - July/August 2016 - 5
SAMPE Journal - July/August 2016 - 6
SAMPE Journal - July/August 2016 - 7
SAMPE Journal - July/August 2016 - 8
SAMPE Journal - July/August 2016 - 9
SAMPE Journal - July/August 2016 - 10
SAMPE Journal - July/August 2016 - 11
SAMPE Journal - July/August 2016 - 12
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SAMPE Journal - July/August 2016 - 16
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SAMPE Journal - July/August 2016 - 18
SAMPE Journal - July/August 2016 - 19
SAMPE Journal - July/August 2016 - 20
SAMPE Journal - July/August 2016 - 21
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SAMPE Journal - July/August 2016 - Cover3
SAMPE Journal - July/August 2016 - Cover4
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