Multiple spatially localized dynamical states in friction-excited oscillator chains
- Journal of Sound and Vibration
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29th Robert J. Melosh Competition - Call for Applicants & Papers
Twenty-ninth edition of the Annual Robert J. Melosh Competition at Duke University
Duke University will host on April 27, 2018 the XXIX Annual Robert J. Melosh Competition for best papers by graduate (or recently graduated) students. The deadline for extended abstract submission is January 22, 2018.
Fontanela instability in non-linear oscillators with cyclic symmetry
I wanted to bring attention to the very important Fontanela et al recent results in vibrations of cyclic structures like in turbine engines.
Can you "chop" a mechanical wave?
In this paper we highlight several interesting phenomena that may emerge from coupling simple elastic systems like 1d bars. While in compostes we usually focus on wave propagation normal to the stratification direction (composite layers are coupled in series), here we show that extreme attenuation at multiple frequencies may emerge in linear systems that are coupled transversaly. We also introduce a simple device that act as a chopper for mechanical signals.
Poisson Contraction and Fiber Kinematics in Tissue: Insight from Collagen Network Simulations
Connective tissue mechanics is highly non-linear, exhibits a strong Poisson effect and is associated with significant collagen fiber re-arrangement. Although the general features of the stress-strain behavior in tension and compression and under uniaxial, biaxial and shear loading have been discussed extensively, especially from the macroscopic perspective, the Poisson effect and the kinematics of filaments have received less attention. In general, the relationship between the microscopic fiber network mechanics and the macroscopic experimental observations remains poorly defined.
About periodic BC for large mesh in ABAQUS
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Hi all,
I'm using ABAQUS-2016 to run a parallel simulation, and I met a problem for assigning periodic BC in large mesh size. I want to make four nodes to be periodic with each other. Normally, I give the node pair in the equation option as:
*Equation
2
nset_1, 2, 1.
nset_2, 2, -1.
*Equation
2
nset_1, 2, 1.
nset_3, 2, -1.
*Equation
2
nset_2, 2, 1.
nset_4, 2, -1.
Perfectly matched layers
Hello,
I am looking for a practical reference/example on how to implement the perfectly matched layers for mechanical problems in a Finite Element code. I want to model a plate where it is surrounded by the PML from all sides, like a piece of earth crust surrounded by the land. The sources which I see for PML, are mostly in the area of electromagnetics.
Your inputs are appreciated.
Setareh
Stress induced by diffusion, curvature, and reversible electrochemical reaction in bilayer lithium-ion battery electrode plates
In this paper, a new reaction-diffusion model, coupling the reversible electrochemical reaction, Lithium (Li) diffusion, and bending, is proposed to investigate the curvature, neutral axis movement, and stress in bilayer electrode. Bending curvature and stress, for the first time, are analytically and numerically investigated relate to both the diffusion and the reversible electrochemical reaction. The results reveal that the reversible electrochemical reaction retards the lithiation process, leading to the slowing down of diffusion process.