I can simply say that the test result and the failure of specimens were in our expectation. The specimens broke down in to two parts, as same as the picture shown in the result, because it was push by the force that applied above and under it that’s why the formula uses 2P. Another one to remind is the parameter P in formula is in the unit of Kn but the result need to be shown in Kg/〖cm〗^2, so If you want the result in Ksc, please don’t forget to multiply the result with 101.937 as I’ve noted.
For the beams, our experiment went well. The beams broke down at the center of them and there is no problem throughout the test. So we record the ultimate load which is in the unit of Kg (because the machine is the old one) and just substitute in the formula, you can get the tensile strength or the Modulus of Rupture. But if the beam was broken at a point where it is out of *1/3 of beams (*1/3 means 15cm in the middle of it) and the distance is less than 5% measure from the rim or fracture line of *1/3, you have to use 3PA/(bd^2 ) instead. Otherwise you have to perform test again.