the Tyvek ripped...
Now I have to go question everything I know to be true about the universe...
If you put a piece of masking tape on Tyvek, then rip it off, you will see that a layer of fiber is removed. There is no shear strength in Tyvek.
It may not be rocket science, but it's still science.
I am surprised that the tyvek didn't work well, I sew tyvek sails for my sailing canoe and such and havn't had one blow out in the severe winds I've sailed in.
Perhaps a double layer might be a bit more resilient?
Point loads are the problem. Sails have huge gussets for distributing corner loads. Perhaps that is the key with a Tyvek hammock.
I would think that gussets made out of ripstop, laminated to the Tyvek, in peak load areas would go a long way.
Tyvek is great until you get a stress riser in it ... a nick on a side, for example .... There's where the tear will propagate from.
Many a good hanging prevents a bad marriage
"Insert witty and intelligent statement here"