TL;DR: I make a cylindrical disc out of material X. Fill it with fluid and apply pressure on top of the disc which pushes the curved part of the cylinder outwards till fluid pressure breaks it. The tensile strength can then be determined by doing $5 X$ (Maximum Fluid Pressure). This should give the same answer for tensile strength as obtained in uniaxial loading.
So I've been looking at a few material tests and they all start with a rectangular sample of the material, loaded into a machine which extends them by increasing load at a constant rate and measures the strain/stress till the point of material fracture. The yield stress is measured in usually MPa which has the same units of pressure.
I was wondering if I could measure the tensile strength of a material in an alternative way. Say I have made a cylinder out of the material whose tensile strength is to be measured. I then fill up the cylinder with some fluid and apply pressure to it and measure the YIELD STRENGTH at the point when my disc ruptures.
I'm aware that compared to the previous uniaxial loading, now I'm loading it in possibly 2 or 3 directions or maybe 5 directions: The material at any point is being pushed in $\pm x$ directions and also in $+z$ direction, maybe even in $\pm y$ directions. This means that I might have to include a multiplication factor of 3 or 5 to the fluid pressure in order to obtain the total stress on the material.
Now my question is, is this quantity the same as tensile strength? I know that the fluid is converting the vertical compression into tangential stress on the material so technically we should also be calling it pressure but intuition tells me that this is the same thing as tensile strength.
If the material has a tested tensile strength of $100 MPa$ then I should be able to rupture the disc at $20 MPa$.
If I'm wrong please correct me. Thank you!