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This article proposes a novel computational modeling approach forshort-ranged molecular interactions between curved slender fibers undergoinglarge 3D deformations, and gives a detailed overview how it fits into theframework of existing fiber or beam interaction models, either consideringmicroscale molecular or macroscale contact effects. The direct evaluation of amolecular interaction potential between two general bodies in 3D space wouldrequire to integrate molecule densities over two 3D volumes, leading to asixfold integral to be solved numerically. By exploiting the short-range natureof the considered class of interaction potentials as well as the fundamentalkinematic assumption of undeformable fiber cross-sections, as typically appliedin mechanical beam theories, a recently derived, closed-form analyticalsolution is applied for the interaction potential between a given section ofthe first fiber (slave beam) and the entire second fiber (master beam). Thisnovel approach based on a pre-defined section-beam interaction potential (SBIP)requires only one single integration step along the slave beam length to beperformed numerically. In terms of accuracy, the total beam-beam interactionpotential resulting from this approach is shown to exhibit an asymptoticallyconsistent angular and distance scaling behavior. In addition to elementarytwo-fiber systems, carefully chosen to verify accuracy and asymptoticconsistence of the proposed SBIP approach, a potential practical application inform of adhesive nanofiber-grafted surfaces is studied. Involving a largenumber of helicoidal fibers undergoing large 3D deformations, arbitrary mutualfiber orientations as well as frequent local fiber pull-off andsnap-into-contact events, this example demonstrates the robustness andcomputational efficiency of the new approach.

Asymptotically consistent and computationally efficient modeling of  short-ranged molecular interactions between curved slender fibers undergoing  large 3D deformations