Why do ships have cicular windows,why not square ones?
In: Physics
Grab a sheet of plastic and put a shear force on the edge (rip it). Now, it either will need a lot of force to rip, or it will just stretch and deform.
Now, put a small cut or a notch in it. Then try to rip it at that cut. It will easily rip.
Corners in the sheets that make up the hull will also be weak for a similar reason. All the shear force is right in the corner. While the steel won’t immediately rip, it will flex more there and gradually weaken.
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