Journal Article

PUBDB-2026-01716

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Intermittent in-situ mechanical testing of Gecko-inspired dry-adhesive surfaces using synchrotron X-ray nano-computed tomography

Gruener Lima, M. (Corresponding author)Extern* ; Thormann, A. ; Flenner, S.Extern*HZG*Hereon* ; Greving, I.HZG*Hereon* ; de Souza e Silva, J. M.

2026
Inst. of Physics London

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Please use a persistent id in citations: doi:10.1088/1748-0221/21/05/C05017

Abstract: Gecko-inspired surfaces exhibit reversible and repeatable adhesion by leveraging physical interactions rather than chemical bonding. Developing reliable dry-adhesive systems for advanced engineering requires a fundamental understanding of their micro-mechanical response. This study characterizes cone-shaped thermoplastic polyurethane structures using synchrotron nano-computed tomography (nano-CT) and in-situ uniaxial testing. Analysis of two specimens across six loading stages revealed that the tip apex undergoes approximately 28.1% strain, nearly eight times the 3.6% deformation observed at the base. High-resolution 3D datasets captured progressive apex flattening under compression and localized necking during tensile detachment. Finite element simulations using nano-CT-derived models successfully replicated these experimental deformation patterns and stress distributions. The computational models identified a nonlinear relationship between preload and adhesive response, with a maximum residual force occurring at 25% preload. Quantitative agreement with theoretical scaling was further confirmed by a residual strength-scaling exponent near -2, consistent with established power-law trends for bioinspired adhesives. These integrated experimental and computational findings establish an optimal preload regime and provide quantitative design bases for task-specific gecko-inspired adhesives.

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Contributing Institute(s):

1. DOOR-User (DOOR ; HAS-User)
2. Helmholtz-Zentrum Hereon (Hereon)

Research Program(s):

1. 6G3 - PETRA III (DESY) (POF4-6G3) (POF4-6G3)

Experiment(s):

1. PETRA Beamline P05 (PETRA III)

Appears in the scientific report 2026

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Database coverage:
; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Essential Science Indicators ; IF < 5 ; JCR ; National-Konsortium ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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