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The Space Elevator from Science Fiction to Engineering - page 36 / 50

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What are fatigue failure modes of concern?

Cracking a wheel axle

a disastrous failure for a climber

Rolling fatigue causing spallation of sharp metal chunks from the rim of the wheel

A potential disaster for both ribbon and climber

We need ~100% confidence that a climber will make it to the end of the ribbon

Fatigue allowables are always expressed at 50% confidence of failure

Allowable stresses are reduced to increase confidence

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