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alright guys welcome back in this video we want to start talking about columns and their tendency to buckle when subjected to an axial compressive force now if you remember back at the beginning of the course we talked about normal stress and we calculated normal stress as being equal to the applied load over the cross sectional area now those videos if you notice the the problem was always set up so that the member was in tension and thats because if you slowly apply if you slowly increase that applied load in tension to the point where you get the material yielding were going to find out what that material Im sorry what that yield stress is and from yield stress what you do is you apply your factor of safety and then youre given your allowable stress which is basically just the stress the where the the maximum stress that were going to let the member be subjected to and were not going to be concerned about it yielding at all now in compression even if the normal stress is less