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Purpose     This study aims to model scale effects in nano-beams under torsion.     Design/methodology/approach     The elastostatic problem of a nano-beam is formulated by a novel stress-driven nonlocal approach.     Findings     Unlike the standard strain-driven nonlocal methodology, the proposed stress-driven nonlocal model is mathematically and mechanically consistent. The contributed results are useful for the design of modern devices at nanoscale.     Originality/value     The innovative stress-driven integral nonlocal model, recently proposed in literature for inflected nano-beams, is formulated in the present submission to study size-dependent torsional behavior of nano-beams.

Nano-beams under torsion: a stress-driven nonlocal approach