We performed an experiment on a rectangular box of measured dimensions made from a certain material. We loaded the box with weights until mechanical failure. So, I know the dimensions of the box and the amount of force put on it until it failed. Would I be able to accurately calculate and report the psi of the material we used by simply calculating the surface area of the box and doing the math? Or, is this test inaccurate because the point of mechanical failure might be dependent on the geometry of the rectangular box?