TOOLED THICK COMPOSITES by ARVEN H. SAUNDERS III ...

Resin Pressure (Pa)
1.2E+06
1.0E+06
8.0E+05
6.0E+05
4.0E+05
2.0E+05
0.0E+00
1 3 5 7 9 11 13 15 17 19 21 23 25
Position along Flexbeam Length
Figure 4.13. Resin Pressure Distribution With Respect To Flexbeam Length At Time Of
Full Contact Being Achieved.
At the time of this gradient, the minimum and maximum estimated temperature for the
laminate is 31.7 and 39.4C for a maximum temperature difference of 7.68C. The predicted
viscosity minimum is 1566.30, the maximum is 2243.37, for a maximum viscosity difference
existing of 677.06 Pa-secs. It is strongly suspected that if such a gradient exists, given these
resin property conditions, resin flow patterns will carry along the embedded fibers, causing them
to buckle in a sine wave-like pattern. The maximum temperature and viscosity differences likely
exist between the two ends –the headwaters of flow- rushing in on a collision course towards
the center, where temperature is minimum, and viscosity is maximum. Such a discrepancy in
resin state and pressure would be suitable for resin flow collision, while pressure normal to the
affected center regions would just beginning to be felt. The data described here was associated
with a bulk level of 10%.
For the 15% bulk situation, we can compare the predicted resin pressure distribution at
the time of full contact. The patterns are similar, but the resin state is slightly different at t=180
when full contact occurs. Figure 4.14 presents the estimated resin pressure distribution.
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