Force F applied to a tube with a length L will cause the tube to fail. As the angle deviates from 90°, presumably F2 is lower to induce the same failure. The length of the tube must remain constant, so L2 is longer than L1. All other things being equal, is there a formula to predict F2 as a percentage of F1 if the angle is known? Admittedly, there are many variables, not the least of which is the substance and geometry of the tube. But for the sake of argument, let's say it is a round steel tube.