# Contact of a spherical probe with a stretched rubber substrate

In a recently published paper, we report on a theoretical and experimental investigation of the normal contact of stretched neo-Hookean substrates with rigid spherical probes. Starting from a published formulation of surface Green’s function for incremental displacements on a pre-stretched, neo-Hookean, substrate (L.H. Lee \textitJ. Mech. Phys. Sol. \textbf56 (2008) 2957-2971), a model is derived for both adhesive and non-adhesive contacts. The shape of the elliptical contact area together with the contact load and the contact stiffness are predicted as a function of the in-plane stretch ratios $\lambda_x$ and $\lambda_y$ of the substrate. The validity of this model is assessed by contact experiments carried out using an uniaxally stretched silicone rubber. For stretch ratio below about 1.25, a good agreement is observed between theory and experiments. Above this threshold, some deviations from the theoretical predictions are induced as a result of the departure of the mechanical response of the silicone rubber from the neo-Hokeean description embedded in the model.

### Awards for the best oral and best poster presentations at Days of Doctoral School on Materials Science for three PhD students of SIMM

The annual Days of the Doctoral School 397 “Physics and Chemistry of Materials” took place on the 30th and 31st October on Campus des Cordeliers. (...)

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### Role of Dynamical Heterogeneities on the Mechanical Response of Confined Polymer

Polymer near their glassy transition are known to exhibit dynamical heterogeneities. By “dynamical heterogeneities” one means that local relaxation (...)

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