Should I use screws? Should I glue it on with resin? Or another method? I've never worked with actual carbon fiber so I don't know what would be best.
Is this a unique and novel design for a carbon fiber helmet, or are there existing designs created by seasoned professionals and certified by whatever the helmet certification organizations that you can use as reference in your design?
I'm designing my own helmet.
You should not design your own helmet.
Unless it's purely decorative, I guess.
my school assignment is to design a helmet
Why don't you trust the commercially designed helmets?
Don't know about carbon fiber much but I would go with glueSome quick search results
I would suggest double cap rivets.
See: How to Install Metal Rivets on Sewing Projects | Sew4Home
try to mold the strap in with the rest of the helmet. Make sure the strap that you use will be one that will last about a month, or two of good use. This way they will have to come back and buy more or buy your retro fit strap that you they can attach with flex seal.
Is this a motorcycle helmet? Bicycle? Football? Automotive racing?.
I would attach with Velcro for easy removal in the event of an eminent impact.
After putting so much effort into a cool carbon fiber helmet design, I would hate to think of it getting scratched in the event of an accident.
With straps attached with Velcro, you could quickly grab the helmet, and toss it to the safety of a grass field, or large puddle, or pond before it gets a chance of getting scratched or damaged by impact on a harder surface, such as concrete or asphalt, or a rock or log, if it is for an off-road sport.
BTW. In case my sarcasm doesn't translate over my post, this was sarcasm.
Look at existing helmet designs for the sport you're designing for, and follow their lead. They are experts.
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