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(a) Non-fibrillar structure: force F on an elastic cylindrical flat punch with radius A. (b) Fibrillar structure: force F on many identical small elastic cylindrical fibrils with radius a≪A. (c) Force f on a single elastic fibre with radius c, Young's modulus E and Poisson's ratio ν. In all the three structures, the height of the fibres is assumed to be much larger than other dimensions.
