I want to know in mechanics of materials what is the real objective of finding the deflections at various points in structures(adsbygoogle = window.adsbygoogle || []).push({});

like

1)deflection in the end of an axially loaded bar

2)vertical deflection along the beam length

3)beam slope along the beam length

5)torsion bar twist about the torsion bar axis.

I believe stress is a major criteria rather than deflection because it determines the failure. Then why should we care about deflection at all? Particularly in beam

bending is the slope a major criteria?

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# Stress or deflection which is important

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