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arXiv · 2606.06710

Beyond Snap-Fit: Optimizing the Lifting Capabilities of a Partial Cylindrical Shell

Grace K. Curtis·Ian M. Griffiths·Dominic Vella
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Abstract

The cylindrical snap-fit is a ubiquitous fastening method that is both simple to manufacture and assemble, and yet secure. It consists of a partial cylindrical shell that `snaps' onto a cylindrical object. We build on previous work to describe the mechanics of the cylindrical snap-fit as a naturally curved thin elastic shell placed atop a rigid cylinder; we investigate the shell's behaviour when subject to a point force pushing it onto or pulling it off the cylinder. We classify the possible contact regimes according to whether the shell has a nonzero lifting capacity. We term situations with lifting capacity `grip-fits' and show that this includes both the snap-fit and a `stick-fit' regime, which allows lifting despite not having the characteristic `snap'. Regimes without lifting capacity are also characterized for completeness. We show that the different regimes may be characterized entirely by the shell/cylinder geometry and the coefficient of friction. We then consider different metrics for the lifting performance in the grip-fit regime. Our analysis reveals the trade-offs between assembly force, disassembly force, lifting force, and clamping force, providing design principles for secure lifting, easy detachment, and safe handling of fragile objects.

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Grace K. Curtis, Ian M. Griffiths, Dominic Vella. 2026-06-04. Beyond Snap-Fit: Optimizing the Lifting Capabilities of a Partial Cylindrical Shell. https://arxiv.org/abs/2606.06710

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