Abstract
We consider a bi-dimensional sheet consisting of two orthogonal families of inextensible fibres. Using the representation due to Rivlin and Pipkin for admissible placements, i.e. placements preserving the lengths of the inextensible fibres, we numerically simulate a standard bias extension test on the sheet, solving a non-linear constrained optimization problem. Several first and second gradient deformation energy models are considered, depending on the shear angle between the fibres and on its gradient, and the results obtained are compared. The proposed numerical simulations will be helpful in designing a systematic experimental campaign aimed at characterizing the internal energy for physical realizations of the ideal pantographic structure presented in this paper.
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Acknowledgments
The authors gratefully acknowledge the financial support of the International Research Center on the Mathematics and Mechanics of Complex Systems (M&MoCS). The interesting discussions with the participants of the workshop Computational Mechanics of Generalized Continua and Applications to Materials with Microstructure [Catania, 29–31 October 2015, Scuola Superiore di Catania, and the François Cosserat-Tullio Levi Civita International Laboratory associated to CNRS (LIA Coss&Vita)] were very fruitful and greatly influenced this work.
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dell’Isola, F., Cuomo, M., Greco, L. et al. Bias extension test for pantographic sheets: numerical simulations based on second gradient shear energies. J Eng Math 103, 127–157 (2017). https://doi.org/10.1007/s10665-016-9865-7
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DOI: https://doi.org/10.1007/s10665-016-9865-7
Keywords
- Bias extension test
- Constrained optimization
- Inextensible fibre network
- Pantographic sheet
- Second gradient theory