# Lateral indentation of a thin elastic film

2 ELAN - ModELisation de l'apparence des phénomènes Non-linéaires
Inria Grenoble - Rhône-Alpes, LJK - Laboratoire Jean Kuntzmann
Abstract : Indentation is a standard, widely used technique in mechanical assays and theoretical analysis. It unveils the fundamental modes of deformation and predicts the response of the material under more complex loads. Here we present an experimental setup for testing thin-film materials by studying the lateral indentation of a narrow opening cut into a film, triggering a cascade of buckling events. The force response F is dominated by bending and stretching effects for small displacements and slowly varies with indenter displacement $F\sim d^{2/5}$ , to finally reach a wrinkled state that results in a robust nonlinear asymptotic relation, $F\sim d^4$. Experiments with films of various thicknesses and material properties, and numerical simulations confirm our analysis and help to define an order parameter that accounts for the different response regimes observed in experiments and simulations.
Document type :
Journal articles
Domain :

https://hal.inria.fr/hal-03512390
Contributor : Victor Romero Connect in order to contact the contributor
Submitted on : Wednesday, January 5, 2022 - 1:21:32 PM
Last modification on : Sunday, June 26, 2022 - 3:30:50 AM
Long-term archiving on: : Wednesday, April 6, 2022 - 7:11:39 PM

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### Citation

Miguel Trejo, Victor Romero, Eugenio Hamm, Enrique Cerda. Lateral indentation of a thin elastic film. Soft Matter, Royal Society of Chemistry, 2022, 18 (4), pp.762-767. ⟨10.1039/d1sm01348c⟩. ⟨hal-03512390⟩

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