We had a rejection for some plastic washers where the material is in question. The parts smashed under torque loading. Since I don't have a durometer or a torque wrench sensitive enough I decided to do a comparison of the two parts on the Rockwell Hardness tester. I set it up as follows:
1) Removed the penetrator
2) Placed washer on test stage.
3) Inserted a hardened gage pin big enough to cover the washer between the washer and loading head.
4) Set the pre-load weight to 60 Kg. (our lightest load)
5) Ran test.
6) Read results from the Rc Scale.
The results showed a about a 20 point difference in the mat'l and allowed us to sort the parts.
This lead me to thinking---(I know, dangerous on a Friday)
Is there a way to convert Torque (ft-lb) to Pressure applied (PSI)?
And additionally what sort of reading this info might be expected to generate on a Rockwell Tester.
Call it the Friday Puzzler...