Thank you all for your replies.
Woodyjumps, you were very much on point, I applied a thermocouple and took readings. There was a trend in temperature rise and pressure increase. I did a quick Bulk Modulus calculation, the pressure increase was directly proportional to temperature rise...
Hi,
The fluid sack is actually a ptfe pneumatics hose that is filled with dipropylene glycol.
The vertical load on it increases the internal hydrostatic pressure to 68 Bar, when it is sheared it slowly creeps up to 74 bar, over roughly 2500 cycles.
We have ruled out temperature and sack size change as neither of these are detectable.
The entire set-up up is within the shearing rig, we are wondering if it ids the effects of putting a hydraulic ram through the shearing action.
Hi,
This is the first time I am using this forum. Thank you all in advance.
I have a problem with hydrostatic pressure increase in a fluid sack sealed within a rigid support that I am shear testing.
The set-up is quite simple, the fluid sack is filled with an incompressible fluid and a...
