Hi, Ive just joined as ive spent the last few months falling onto this site to try and help me in various bits and peices. I am however stuck on something. For part of my dissertation (automotive) I am introducing a brace into a subframe of a competing drift car. To save weight this is brace is going to be a diagonal hollow tube from one corner to the other. (the current subframe setup is basicly a square). I need to justify the size of the tube I use including wall thickness. The tube will be mainly loaded in tension and compression which is what I will be focusing on. Whats known/fixed Length Max load Material/material properties of low carbon steel I am worried that I am overcomplecating things in my head. Is it just a simple pressure = force/area for a solid bar, working that out and then trying to get that strength out of a tube? Everything I search for seems to come up with torsional loading or bending. Any help will be hugely apreciated.. Not necciserally an answer, just a point in the right direction.