Modeling, experimental characterization, and uncertainty quantification of auxetic foams: hyperelastic and fractional viscoelastic mechanics

Eugenia Stanisaukis; Hannah Solheim; Somayeh Mashayekhi; Paul Miles; William Oates

doi:10.1117/12.2557630

22 April 2020 Modeling, experimental characterization, and uncertainty quantification of auxetic foams: hyperelastic and fractional viscoelastic mechanics

Eugenia Stanisaukis, Hannah Solheim, Somayeh Mashayekhi, Paul Miles, William Oates

Author Affiliations +

Proceedings Volume 11377, Behavior and Mechanics of Multifunctional Materials IX; 113770A (2020) https://doi.org/10.1117/12.2557630
Event: SPIE Smart Structures + Nondestructive Evaluation, 2020, Online Only

Abstract

Auxetic foams have a variety of unique properties due to their negative Poisson ratio such as high energy absorption and fracture toughness for applications such as sports safety equipment, packing material, and shoe soles. The viscoelastic behavior of this relatively new material has not been extensively studied and modeled. Better knowledge of the viscoelastic behavior over a broad range of deformation rates is critical when considering the mechanical properties of the material. Previous modeling for positive Poisson ratio materials has been completed successfully to characterize the behavior. This same modeling was applied to auxetic foams with less success. The influence of nonlinear compressibility effects greatly improved calibration and prediction. Model simulations across several orders of magnitude in deformation rates are validated against data. All results are statistically validated using maximum entropy methods to obtain posterior densities for the hyperelastic and fractional order parameters. Importantly, a maximum entropy algorithm is used such that heterogeneous data can be fused to inform and validate the model and quantify its uncertainty.

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Citation Download Citation

Eugenia Stanisaukis, Hannah Solheim, Somayeh Mashayekhi, Paul Miles, and William Oates "Modeling, experimental characterization, and uncertainty quantification of auxetic foams: hyperelastic and fractional viscoelastic mechanics", Proc. SPIE 11377, Behavior and Mechanics of Multifunctional Materials IX, 113770A (22 April 2020); https://doi.org/10.1117/12.2557630

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