Re: Rubber testing: Chiming In

From: joemargbartek <j.bartek_at_sbcglobal.net>
Date: Fri, 09 Nov 2012 20:18:21 -0000

Mike
Looking at your initial post, I see that you'll be using 5 X extension on 0.053 inch rubber for the start of your "wind to failure" test. Not sure how long a loop would last stretched that far. I haven't used that much stretch for Bostonians and such with wider rubber. Do you measure force to stretch the loop with a fish scale or similar? Perhaps adding weights to a suspended loop, like a high school physics Hooke's Law experiment would give you that.

A starting point would perhaps use a 6 inch loop of 0.053 inch rubber stretched between 2 No. 10 wood screws 18 inches (3X) apart in a board. The larger wood screws might be smooth enough to keep the strain from concentrating there.

I've got a box of FAI tan in 3/32 inch (0.094") and should generate some preliminary data before we talk "exact" though.

Joe

--- In Indoor_Construction_at_yahoogroups.com, "mkirda@..." <mkirda@...> wrote:
>
> Be happy to if you could write up exactly what you want me to try.
>
> --- In Indoor_Construction_at_yahoogroups.com,
>
> Maybe
> > > Mike Kirda could take some loops of his rubber and stretch them over
> > > some nails in a board, with and without lube, to give a "days to break"
> > > number.
>
Received on Fri Nov 09 2012 - 12:18:23 CET