Why are all the connecting flanges of the main shaft designed flexible?

Question

Question PPL(H) - Private Pilot License - Aircraft General Knowledge

QuizVDS · Accepted Answer

To compensate for thermal stresses and installation errors

QuizVDS · Answer

For the distribution of pressure and tensile forces

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To have a predetermined breaking point for engine damage

QuizVDS · Answer

For the frictional connection to the main rotor gearbox

Id 162 - PPL(H) EN - Why are all the connecting flanges of the main shaft designed flexible?