Deformation Field in Diametrically Loaded Soft Cylinders
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Deformation fields at the surface of diametrically squeezed shallow cylinders in the large deformation regime are measured experimentally and numerically for different material behaviour in the large deformation regime. By means of a digital image correlation method optimized for large displacements, strain fields are measured and compared with finite element simulations. Assuming a neo-Hookean behaviour for cylinders made of rubber silicone, the strain field is found to be in quantitative agreement with non-linear finite element simulations up to the highest deformations reached in our experiments (15%). For materials that follow an elastoplastic constitutive law, agreement is lost after few percents of deformation and location of the strain field differences are identified up to strains as high as 30%. Strain field evolution is also measured for solid foam cylinders up to 60% of global deformation strain. This method that can be applied to a broad variety of materials, even in the occurrence of large deformations, provides a way to study quantitatively local features of the mechanical contact.
KeywordsSoft particle Finite strain Digital image correlation
The authors would like to thank Bertrand Wattrisse for his support with the digital image correlation method, Mathieu Renouf and Frédéric Dubois for their help with numerical simulations. Gille Camp and Stéphan Devic are also greatly thanked for their technical support. This work was supported by the Labex NumEv (anr-10-labx-20) for Jonathan Barés.
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