Large Deflections of Inextensible Cantilevers: Modeling, Theory, and Simulation
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Date
2020-09-24
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Citation of Original Publication
Deliyianni, Maria et al. "Large deflections of inextensible cantilevers: modeling, theory, and simulation." Math. Model. Nat. Phenom. 15 (24 September 2020). DOI: https://doi.org/10.1051/mmnp/2020033
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Attribution 4.0 International (CC BY 4.0)
Attribution 4.0 International (CC BY 4.0)
Abstract
A recent large deflection cantilever model is considered. The principal nonlinear effects come through
the beam’s inextensibility—local arc length preservation—rather than traditional extensible effects
attributed to fully restricted boundary conditions. Enforcing inextensibility leads to: nonlinear stiffness terms, which appear as quasilinear and semilinear effects, as well as nonlinear inertia effects,
appearing as nonlocal terms that make the beam implicit in the acceleration.
In this paper we discuss the derivation of the equations of motion via Hamilton’s principle
with a Lagrange multiplier to enforce the effective inextensibility constraint. We then provide the
functional framework for weak and strong solutions before presenting novel results on the existence
and uniqueness of strong solutions. A distinguishing feature is that the two types of nonlinear terms
prevent independent challenges: the quasilinear nature of the stiffness forces higher topologies for
solutions, while the nonlocal inertia requires the consideration of Kelvin-Voigt type damping to
close estimates. Finally, a modal approach is used to produce mathematically-oriented numerical
simulations that provide insight to the features and limitations of the inextensible model.