Allowable bearing stress for PVC
Allowable bearing stress for PVC
(OP)
Hello,
What is an allowable bearing stress for PVC. I'm bolting a plate to a PVC disc and need to transmit torque and to size the fasteners and qty of fasteners, I need to know an allowable bearing stress.
Thanks,
Kyle
What is an allowable bearing stress for PVC. I'm bolting a plate to a PVC disc and need to transmit torque and to size the fasteners and qty of fasteners, I need to know an allowable bearing stress.
Thanks,
Kyle






RE: Allowable bearing stress for PVC
In general, the allowable bearing stress (or surface pressure) can be defined based on surface indentation. For metals, this is time-independent and near the ultimate tensile strength. For polymers that stress relax, you need to keep the pressure lower to avoid preload loss.
Testing is best, but in the absence of that, I would target ~ 50% of the yield stress.
Regards,
Cory
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.
RE: Allowable bearing stress for PVC
I'll find the yield stress and provide a generous factor of safety.
Kyle
RE: Allowable bearing stress for PVC
A lot depends on conditions of use re temperature and duration of load.
Regards
eng-tips, by professional engineers for professional engineers
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.
RE: Allowable bearing stress for PVC
Thanks for the responses. Can you recommend a site with the yield stress for PVC? Most sites I've visited have every mechanical property but yield stress.
Thanks,
Kyle
RE: Allowable bearing stress for PVC
Regards,
Cory
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.
RE: Allowable bearing stress for PVC
We'll be purchasing the PVC from McMaster Carr initially but will find a distributor for production quantities. I'll call them to see if they have any data. I've checked the GE polymers site and some others.
One site listed it as 40,000,000 N/m^2 which converts to about 5800 psi (check my math) but values for more familiar materials like steel and aluminum didn't seem right so I'm not inclined to trust the data.
Kyle
RE: Allowable bearing stress for PVC
http://www.matweb.com/index.asp?ckck=1
http://www.rtpcompany.com/
Regards
eng-tips, by professional engineers for professional engineers
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.