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Temperature Control of Filament Wound Composites during the Gelling Process

Temperature Control of Filament Wound Composites during the Gelling Process. By: Matt Ballard and Brooks Lively. Problem. New low viscosity epoxy resin Must be gelled at 80°C or above. Wanted to make sure the inside of the composite was getting gelled as well as the outside

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Temperature Control of Filament Wound Composites during the Gelling Process

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  1. Temperature Control of Filament Wound Composites duringthe Gelling Process By: Matt Ballard and Brooks Lively

  2. Problem • New low viscosity epoxy resin • Must be gelled at 80°C or above. • Wanted to make sure the inside of the composite was getting gelled as well as the outside • Cannot directly measure the inside of the composite, as thermocouple leads would ruin the composite

  3. Test Set-up Attached thermocouple leads to the inside of composite and inside of hollow steel mandrel. Measured and recorded temperatures at the two nodes at time intervals of 1 min for 60 min

  4. Analysis From collected data, determined that the process had reached steady state at about t = 45 min Used temperatures at the two nodes to determine an average q”, which in turn can be used to approximate Tm,o from known Tm,i Fairly accurate after about 15 minutes

  5. Analysis (cont.) Fiber Reinforced Epoxy Composite . Hollow Low Carbon Steel Mandrel . . . r q” Steady-state heat flux through the mandrel was determined using a thermal circuit analysis (with mandrel properties and temperatures known) Where Found that (on average, once steady state is reached) : This can now be used to determine the outer mandrel temperature from the inner mandrel temperature

  6. Conclusions Determined that inside of composite does reach 80°C This method can be used to predict temperature at the mandrel-composite interface Simple, inexpensive solution, but can only be used with specific settings

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