Thanks Mariog & Michael for the enlightenment. As engineers, our concern with sharp corners is the stress concentration & ultimately if fatigue is a concern, then we have a way around this, by designing a smooth transition in the corners to have a well defined stress that is converging to a reasonable value. I remember an article regarding the old design of airplane windows which are rectangular & now becomes rounded in shape.

This is why many FEA consultants have been performing physical testing to match the theory & reality as close as practically possible.

Any other opinion is highly appreciated!!



Cheers!!