Abstract
This work investigates the application of space–time fractional-order operators to the simulation of linear elastic waves propagating in 1D periodic structures resting on a viscoelastic foundation. More specifically, this study focuses on the possible application of fractional-order mathematics as the foundation to develop efficient reduced-order models capable of capturing the wave dynamics in periodic, viscoelastic one-dimensional metamaterials. By leveraging a space–time fractional formulation of the wave equation, we develop a homogenized model capable of capturing either material or geometric inhomogeneity and viscoelastic behavior. First, we derive the dispersion relation for a 1D infinite periodic bar resting on a longitudinal viscoelastic foundation using integer order formulation, which serves as a reference point in this work. Then, we obtain the dispersion relationships associated with two different fractional formulations. The first formulation relies on the use of time-fractional derivatives and focuses on capturing the dissipation induced by the viscoelastic foundation. The second formulation relies on the use of space–time fractional derivatives in order to lead to a homogenized one-dimensional model of the periodic bar. In order to achieve real-valued fractional orders, a matching approach between the dispersion relations of the fractional- and integer-order differential equations is used. Numerical simulations show that the space–time fractional wave equation serves as an effective homogenized model that well represents the wave propagation in a 1D periodic bar on a viscoelastic foundation. The results also illustrate that the use of space-fractional derivatives allows modeling the dynamics within (low order) frequency band gaps, a result typically not achievable with classical homogenization techniques.
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Notes
Recall that for a 1D viscoelastic element the stress and strain (also strain rate) are related as: \(\sigma (x) = E \epsilon (x) + E^\prime {\dot{\epsilon }}(x) \equiv E {\mathrm {d}u}/{\mathrm {d}x} + E^\prime {\mathrm {d} {\dot{u}}}/{\mathrm {d}x}\) [13]
Abbreviations
- \(\rho _i\) :
-
Mass density for material i
- \({\hat{\rho }}_i\) :
-
Effective mass density for material i in time-fractional wave equation
- \({\hat{\rho }}\) :
-
Effective mass density in space–time fractional wave equation
- \(E_i\) :
-
Young’s modulus for material i
- \({\hat{E}}\) :
-
Effective Young’s modulus in space–time fractional wave equation
- \(L_i\) :
-
Length of material i within the unit cell
- \(\Delta _{\mathrm{L}}\) :
-
Length of the unit cell
- A :
-
Cross-sectional area
- k :
-
Elastic stiffness parameter of the viscoelastic foundation
- c :
-
Damping parameter of the viscoelastic foundation
- \({\overline{k}}\) :
-
Effective elastic stiffness parameter of the viscoelastic foundation
- \({\overline{c}}\) :
-
Effective damping parameter of the viscoelastic foundation
- \(\mu \) :
-
Wavenumber in integer-order Bloch wave solution
- \({\tilde{\mu }}\) :
-
Wavenumber in time-fractional Bloch wave solution
- :
-
Wavenumber in space–time fractional Bloch wave solution
- f :
-
Frequency
- \(\omega \) :
-
Angular frequency
- \(\Re (\cdot )\) :
-
Real component
- \(\Im (\cdot )\) :
-
Imaginary component
- \(u_i\) :
-
Integer-order Bloch wave solution for material i
- \({\tilde{u}}_i\) :
-
Time-fractional Bloch wave solution for material i
- :
-
Space–time fractional Bloch wave solution
- \(U_i\) :
-
Periodic function defined in integer-order Bloch wave solution for material i
- \({\tilde{U}}_i\) :
-
Periodic function defined in time-fractional Bloch wave solution for material i
- :
-
Amplitude in space–time fractional Bloch wave solution
- \(\lambda _i\) :
-
Exponent defined in integer-order Bloch wave solution for material i
- \({\tilde{\lambda }}_i\) :
-
Exponent defined in time-fractional Bloch wave solution for material i
- \(\beta _i\) :
-
Time-fractional order for material i in time-fractional wave equation
- \(\alpha \) :
-
Space-fractional order in space–time fractional wave equation
- \(\beta \) :
-
Time-fractional order in space–time fractional wave equation
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Acknowledgements
The authors gratefully acknowledge the financial support of the National Science Foundation (NSF) under grants MOMS #1761423, and the Defense Advanced Research Project Agency (DARPA) under grant #D19AP00052. J.P.H. acknowledges the financial support of the National Defense Science and Engineering Graduate Fellowship (NDSEG). S.P. acknowledges the financial support of the School of Mechanical Engineering, Purdue University, through the Hugh W. and Edna M. Donnan Fellowship. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation. The content and information presented in this manuscript do not necessarily reflect the position or the policy of the government. The material is approved for public release; distribution is unlimited.
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Ding, W., Hollkamp, J.P., Patnaik, S. et al. On the fractional homogenization of one-dimensional elastic metamaterials with viscoelastic foundation. Arch Appl Mech 93, 261–286 (2023). https://doi.org/10.1007/s00419-022-02170-w
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DOI: https://doi.org/10.1007/s00419-022-02170-w