Adam Posted February 14 Share Posted February 14 In our Composite Materials class we created these cool bowls using carbon fiber prepreg pieces, shaped into a metal bowl-shaped mold. There are seven layers. We did a vacuum bag debulk after layer 4. The most difficult part was ensuring that there was no "bridging" of the material and minimizing wrinkles. Quote Link to comment Share on other sites More sharing options...
lo_0l Posted February 27 Share Posted February 27 On 2/13/2023 at 4:06 PM, Adam said: In our Composite Materials class we created these cool bowls using carbon fiber prepreg pieces, shaped into a metal bowl-shaped mold. There are seven layers. We did a vacuum bag debulk after layer 4. The most difficult part was ensuring that there was no "bridging" of the material and minimizing wrinkles. This looks awesome @Adam! What are you making next? 🙂 Quote Link to comment Share on other sites More sharing options...
Mongo Posted February 28 Share Posted February 28 How is a vacuum bag debulk procedure different to the procedure that creates the final part... (different other than simply not introducing the heat to melt the resin)? Can I reuse the bag for several debulks? Can I reuse the bag for the final part? Quote Link to comment Share on other sites More sharing options...
John Kimball Posted March 6 Share Posted March 6 On 2/28/2023 at 4:21 PM, Mongo said: How is a vacuum bag debulk procedure different to the procedure that creates the final part... (different other than simply not introducing the heat to melt the resin)? Can I reuse the bag for several debulks? Can I reuse the bag for the final part? The debulk process is just vacuum bagging the part for a few minutes to consolidate the plies before moving on. the more plies you have, the more loft the part will have. Debulking decreases the loft. On contoured parts it's very a very important step. The only difference in debulking and curing is the heat. Debulking can be as short as 15 minutes under vacuum or overnight. Sometimes a pressure debulk is needed in the autoclave, and sometimes a heated debulk is needed to help the resin flow a little bit. Typically, debulks are used every 4 plies, but depends on the thickness of the part. The bag can be reused for the debulks, but aren't usually used again for the cure. 1 Quote Link to comment Share on other sites More sharing options...
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