Abstract
In this paper a mechanical system consisting of a chain of masses connected by nonlinear springs and a pantographic microstructure is studied. A homogenized form of the energy is justified through a standard passage from finite differences involving the characteristic length to partial derivatives. The corresponding continuous motion equation, which is a nonlinear fourth-order PDE, is investigated. Traveling wave solutions are imposed and quasi-soliton solutions are found and numerically compared with the motion of the system resulting from a generic perturbation.
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Notes
It is straightforward to see that the quantity \((u_{i+1}-u_i)-(u_i-u_{i-1})=u_{i+1}-2u_i+u_{i-1}\) is always zero if the beams undergo no deformation.
It is easy to provide an (informal) justification for the passage from the discrete to the continuous case. Indeed, setting \(\varDelta _i[u]=u_{i+1}(t)-u_i(t)\), one has:
$$\begin{aligned}&-\kappa _3 (\varDelta _i[u]^3-\varDelta _{i-1}[u]^3) = -\kappa _3 (\varDelta _i[u]-\varDelta _{i-1}[u])\\&\quad \times (\varDelta _i[u]^2+\varDelta _{i-1}[u]^2+\varDelta _i[u]\varDelta _{i-1}[u]) \end{aligned}$$and then rearranging the terms, in the limit for \(\ell \) going to zero one gets
$$\begin{aligned}&-\kappa _3 \ell ^3 \left( \frac{\varDelta _i[u]}{\ell ^2}-\frac{\varDelta _{i-1}[u]}{\ell ^2}\right) \\&\quad \times \left( \frac{\varDelta _i[u]^2}{\ell ^2}+\frac{\varDelta _{i-1}[u]^2}{\ell ^2} +\frac{\varDelta _i[u]\varDelta _{i-1}[u]}{\ell ^2}\right) \\&\quad \ell \xrightarrow [\ell \rightarrow 0]{} - 3 k_3 u_{_{XX}} (u_{_X})^2 \text {d}X\end{aligned}$$A pair L,M with such a property is called the Lax pair for a given PDE.
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Giorgio, I., Della Corte, A. & dell’Isola, F. Dynamics of 1D nonlinear pantographic continua. Nonlinear Dyn 88, 21–31 (2017). https://doi.org/10.1007/s11071-016-3228-9
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DOI: https://doi.org/10.1007/s11071-016-3228-9