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Best metamaterial design method in the world

      Jiang Ke. Orthotropic metamaterials with freely tailorable elastic constants. Preprint at https://doi.org/10.48550/arXiv.2205.14176 (2022).  

      It has great application value in the fields of mechanical metamaterials, elastic wave metamaterials, acoustic metamaterials, and seismic metamaterials, and has opened up a broad road for realizing the dream of controlling elastic waves, acoustic waves and vibrations.

Joshua's picture

Direct 4D printing for double-curvature and multimodal morphing

Most 4D printings utilize 1D structural deformation — bending and coiling to morph a flat shape by controlling only a single curvature, limiting the realization of complex 3D curved surfaces with two curvatures. We quantitatively analyze the morphing of a 2D plate into doubly curved surfaces on a direct 4D printing of a single isotropic material employing anisotropy of shape memory effect during the extrusion-based printing.

M. Jahanshahi's picture

A compatible mixed finite element method for large deformation analysis of solids in spatial configuration

In this work, a new mixed finite element formulation is presented for the analysis of two-dimensional compressible solids in finite strain regime. A three-field Hu-Washizu functional, with displacement, displacement gradient and stress tensor considered as independent fields, is utilized to develop the formulation in spatial configuration. Certain constraints are imposed on displacement gradient and stress tensor so that they satisfy the required continuity conditions across the boundary of elements.

arash_yavari's picture

The Universal Program of Nonlinear Hyperelasticity

For a given class of materials, universal deformations are those that can be maintained in the absence of body forces by applying only boundary tractions.  Universal deformations play a crucial role in nonlinear elasticity. To date, their classification has been accomplished for homogeneous isotropic solids following Ericksen's seminal work, and  homogeneous anisotropic solids and inhomogeneous isotropic solids in our recent works. In this paper we study universal deformations for inhomogeneous anisotropic solids defined as materials whose energy function depends on position.

Jinxiong Zhou's picture

Multiscale modeling of viscoelastic behavior of unidirectional composite laminates and deployable structures

Due to the inherent viscoelasticity of constituent matrix and the possibility of long-term storage, space deployable structures made of composites are likely to exhibit relaxation in the stored strain energy, which may degrade their deployment performance. This paper presents a bottom-up finite element based multiscale computational strategy that bridges the experimentally measurable properties of constituent fibers and matrix to numerical predictions of viscoelastic behavior of composite laminates and general shell structures.

Shashank Pathrudkar's picture

Machine learning based prediction of the electronic structure of quasi-one-dimensional materials under strain

I am happy to share our recent work, that has been published in the Physical Review B journal. I would be happy to share the paper with anyone interested, let me know if you cannot access the paper otherwise.

Figure 2 

Zhaohe Dai's picture

Droplets on lubricated surfaces: The slow dynamics of skirt formation

Dear iMechanicians,

I would like to share our recent work published in Phys. Rev. Fluids on the statics and dynamics of droplets on lubricated surfaces: 

Droplets on lubricated surfaces: The slow dynamics of skirt formation

Zhaohe Dai and Dominic Vella

Parag Tandaiya's picture

Size effects and failure regimes in notched micro-cantilever beam fracture

Notched micro-cantilever beam fracture (MCF) experiments are increasingly being used to measure fracture toughness of materials at the micro-scale and draw conclusions about size-effects in them. In our recent paper published in Acta Materialia, 'Size effects and failure regimes in notched micro-cantilever beam fracture', we elucidate the failure regimes in MCF experiments and discuss the conditions for validity of MCF tests.

yuzhen's picture

Formation of rolls from liquid crystal elastomer bistrips

By Yuzhen Chen, Alexa S. Kuenstler, Ryan C. Hayward*, Lihua Jin*

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

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