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Determine the principal stresses and the maximum shear stress in a spindle

See attached diagram.

The pedal crank of a racing cycle is to be analysed to assess whether the stresses are excessive. Pedal loads can reach 500N (causing bending) and produce a torque of 100Nm. The location of load application alternates each half rotation of the spindle (from locations A to F) as shown in the attached diagram.

Determine the principal stresses and the maximum shear stress at the bearings (ie locations B and D) and also at the mid-spindle position C under the most adverse loading.

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