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Journal Club for June 2020: Mechanically instructive biomaterials: a synergy of mechanics, materials and biology

 

Mechanically instructive biomaterials: a synergy of mechanics, materials and biology

Zhenwei Ma, Jianyu Li

Department of Mechanical Engineering, McGill University, Montreal, Canada

 

Planar equilibria of an elastic rod wrapped around a circular capstan

We present a study on planar equilibria of a terminally loaded elastic rod wrapped around a rigid circular capstan. Both frictionless and frictional contact between the rod and the capstan are considered. We identify three cases of frictionless contact -- namely where the rod touches the capstan at one point, along a continuous arc, and at two points. We show that, in contrast to a fully flexible filament, an elastic rod of finite length wrapped around a capstan does not require friction to support unequal loads at its two ends.

Mostafa Nouh's picture

Postdoc position at the University at Buffalo – SUNY (Elastic Metamaterials)

The Sound and Vibrations Lab (http://svl.eng.buffalo.edu), directed by Prof. Mostafa Nouh at the University at Buffalo – SUNY, has an opening for a postdoc position in the areas of phononics and elastic metamaterials. The position is supported by an NSF project whose main objective is to investigate the mechanics of space-time-periodic material systems operating within asymmetric, nonreciprocal, non-Hermitian, and/or frequency-selective regimes.

Xiaoyue Ni's picture

Journal Club for Apr 2022: On-Body Mechano-Acoustics

On-Body Mechano-Acoustics

Xiaoyue Ni
Assistant Professor
Department of Mechanical Engineering and Materials Science
Department of Biostatistics and Bioinformatics
Duke University
ni.pratt.duke.edu

 

1. Introduction

Mike Ciavarella's picture

A comment on a hybrid asperity-Persson friction rubber theory by A Emami, S Khaleghian and S Taheri. Friction 9(6): 1707--1725 (2021)

dear collegues, I may be interested to share your views on an "asperity theory" modified Persson's rubber friction contact mechanics theory which I find not clearly motivated and seems to lead to erroneous conclusions ---- but I am also unable to reproduce the results claimed by the authors. The preprint is here, and the original paper attached: https://www.researchgate.net/publication/359392510

karelmatous's picture

A Multiresolution Adaptive Wavelet Method for Nonlinear Partial Differential Equations

A Multiresolution Adaptive Wavelet Method for Nonlinear Partial Differential Equations

Adaptive Wavelet Method

If you are interested in the full lecture on the Multiresolution Adaptive Wavelet Method, I have given The Journal of Computational Physics lecture as the part of the Cassyni project.  

 

oliver oreilly's picture

Curvatures of a Surface and the Rotation of the Unit Normal Vector

Thanks to Weingarten’s formulae [1], which date to 1861, the bending deformation of a Kirchhoff-Love shell can be characterized by examining the variation of the unit normal vector to the surface of the shell. 

 

 

Joshua's picture

Axial-shear mechanical coupling

Anisotropy and chirality create an interesting mechanical coupling – axial-shear coupling. This paper also reports a weak correlation of chirality with negative Poisson’s ratio and a directional negative and positive Poisson’s ratio of a tetra-achiral lattice.

For more information, you can check this paper:
https://www.sciencedirect.com/science/article/pii/S0264127521000368

Joshua's picture

Axial-bending mechanical coupling

We discovered a novel mechanical coupling effect – axial-bending coupling. Unlike Poisson, axial-shear, and axial-twisting coupling effects, this axial-bending coupling occurs at a non-centrosymmetric square lattice.

For more information, you can check this paper:
https://www.sciencedirect.com/science/article/pii/S0264127522001538

Daniel Garcia-Gonzalez's picture

Magneto-Mechanical System to Reproduce and Quantify Complex Strain Patterns in Biological Materials

Based on magneto-active polymers, we provide a non-invasive and real-time control methodology to impose complex mechanical forces on biological systems. The device is conceptualised to be suitable for any traditional microscope! See scheme:

Imagen

arash_yavari's picture

The Universal Program of Linear Elasticity

Universal displacements are those displacements that can be maintained, in the absence of body forces, by applying only boundary tractions  for any material in a given class of materials. Therefore, equilibrium equations must be satisfied for arbitrary elastic moduli for a given anisotropy class. These conditions can be expressed as a set of partial differential equations for the displacement field that we call universality constraints.

Emilio Martínez Pañeda's picture

Phase field fracture predictions of microscopic bridging behaviour of composite materials

Dear iMechanicians,

I hope that you find the following paper of interest. We conducted 3D (phase field) fracture simulations that explicitly resolve the microstructure of composites, predicting the role of key mechanisms such as fibre bridging (i.e., an output of the model, not an input!). 

XiaoyaoPeng's picture

Comparison of simulated and measured grain volume changes during grain growth

This is the preprint of an article that will appear in Physical Review Materials (https://doi.org/10.1103/PhysRevMaterials.6.033402).

Comparison of simulated and measured grain volume changes during grain growth

Xiaoyao Peng, Aditi Bhattacharya, S. Kiana Naghibzadeh, David Kinderlehrer,  Robert Suter,  Kaushik Dayal, and Gregory S. Rohrer

Abstract

PhD Scholarship at Swinburne University of Technology in Melbourne, Australia - Mechanical/Biomechanical Engineering

A PhD student position in the field of mechanics is available in the Department of Mechanical and Product Design Engineering at the Swinburne University of Technology (Melbourne, Australia). The project will focus on developing a new energy-absorbing metamaterial, incorporating the synergistic effect of shear-thickening fluid (STF) and cellular structures, for improved mechanical performance under different loading conditions.

Prior experience with finite element methods and impact testings is highly preferred.

Article: New estimations of the added mass and damping of two cylinders vibrating in a viscous fluid, from theoretical and numerical approaches

This work deals with the small oscillations of two circular cylinders immersed in a viscous stagnant fluid. A new theoretical approach based on an Helmholtz expansion and a bipolar coordinate system is presented to estimate the fluid forces acting on the two bodies. We show that these forces are linear combinations of the cylinder accelerations and velocities, through viscous fluid added coefficients. To assess the validity of this theory, we consider the case of two equal size cylinders, one of them being stationary while the other one is forced sinusoidally.

Journal Club for March 2022: Liquid Nanofoam: Past, Present and Future

 

 

Liquid Nanofoam: Past, Present and Future

 

Mingzhe Li and Weiyi Lu

Department of Civil and Environmental Engineering, Michigan State University

 

1. Introduction

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