Sleeve (muff) coupling: design idealization for torsion When analyzing a sleeve/muff coupling for power transmission, the sleeve is modeled as which type of torsional member? Choose the best option.

ConceptA sleeve (muff) coupling transmits torque through the sleeve that encloses the shaft ends. In torsion analysis, the sleeve is treated as a hollow shaft resisting shear.

ReasoningT = (π/16)·τ_allow·(D_o^4 − D_i^4)/D_oThis is the torsion relation for a hollow circular member (sleeve).

Common pitfallModeling as a thin/thick pressure cylinder is incorrect; there is no internal pressure action—only torsion.

Final AnswerHollow shaft