Trans RINA, Vol 152, Part B1, Intl J Small Craft Tech, 2010 Jan-Jun PROCESSING TIME 5 - 10 min Heaters
temperature ~ 200 ºC
Processing temperature 180 ºC
~ 20 ºC
Heating rate during processing ~ 5-10 ºC/60 min
Heater Joint
Matrix recrystallisation
5 - 10 min
Safe vacuum release temperature ~ 60 ºC
Heating time ~ 30 min Cooling time ~ 30 min Time Figure 9: Typical temperature profile measured at the centre of a fusion-bonded joint during the process. 2.3 (b) Tensile tests
A study was made on the tensile strength of fusion bonded scarf joints. With this purpose, the panel was cut and the edges prepared so that different scarf lengths were available for testing, ranging from 65% to 100%, as shown in Figure 14. This was achieved by fitting the panel in order that it would not exactly match the opening on certain places, providing reduced contact with the hull edges. In these points, a reduced scarf length occurred, where the resin melting process allowed a gap-filling effect. Due to this effect, noticeable deformation was induced in the joints as shown in Figure 14, b.
Figure 11: Well consolidated, resin rich region along the joint line.
Figure 10: Bonded joint section, pre-made panel in white, left; existing hull in black, right. It corresponds to the middle of the samples on Figure 14.
Figure 12: Well-consolidated region along the joint line.
B-38
©2010: The Royal Institution of Naval Architects
Temperature
Heaters temperature crosses 180ºC in ~20 min
Joint reaches 180ºC in ~30 min
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