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Abstract
We use exponential asymptotics to study travelling waves in woodpile systems modelled as singularly perturbed granular chains with zero precompression and small mass ratio. These systems are strongly nonlinear, and there is no analytic expression for their leadingorder solution. We instead obtain an approximated leadingorder solution using a hybrid numerical–analytic method. We show that travelling waves in these nonlinear woodpile systems are typically “nanoptera”, or travelling waves with exponentially small but nondecaying oscillatory tails which appear as a Stokes curve is crossed. We demonstrate that travelling wave solutions in the zero precompression regime contain two Stokes curves, and hence two sets of trailing oscillations in the solution. We calculate the behaviour of these oscillations explicitly, and show that there exist system configurations which cause the oscillations to cancel entirely, producing solitary wave behaviour. We then study the behaviour of travelling waves in woodpile chains as precompression is increased, and show that there exists a value of the precompression above which the two Stokes curves coalesce into a single curve, meaning that cancellation of the trailing oscillations no longer occurs. This is consistent with previous studies, which showed that cancellation does not occur in chains with strong precompression.
Original language  English 

Article number  133053 
Pages (fromto)  114 
Number of pages  14 
Journal  Physica D: Nonlinear Phenomena 
Volume  429 
DOIs  
Publication status  Published  Jan 2022 
Keywords
 Solitary waves
 Exponential asymptotics
 Nanoptera
 Woodpile chains
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Dive into the research topics of 'Nanoptera in nonlinear woodpile chains with zero precompression'. Together they form a unique fingerprint.Projects
 1 Active

A new asymptotic toolbox for nonlinear discrete systems and particle chains
4/02/19 → 30/09/22
Project: Other