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I have a configuration in which a peice of rock is under hydrostatic pressure (see attached figure) and i'm trying to figure out what the stress on this rock will be.

The boundary conditions on the Steel end plates are such that the right and left plates are restricted to move in the -ve X and +ve X directions respectively.

According to my calculations:From FBD, -(6000 X 41.3) + (6500 X 31.6) = -42,400 lbf

Stress = 42400/41.3 = 1027 psi Compressive in axial direction

But i'm not sure about my approach here. I did not account for the force due to 5,850 psi in the rock because it cancels out but I am not sure if it should cancel out or taken into account as an additional compressive load on the rock?

Thanks,

Mike

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# Compressive stress on piece of rock

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