research

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.

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.

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.

To be published on

Civil Engineering Research & Technology

ISSN: 2754-4982

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.

By Yuzhen Chen, Tianzhen Liu, Lihua Jin*

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

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

50 days of the free download link

https://www.sciencedirect.com/science/article/pii/S2352492822005682?dgci...

Permanent link

https://www.sciencedirect.com/science/article/abs/pii/S2352492822005682

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.

Dear iMechanicians,

   Drug repurposing for SARS-CoV-2: a high-throughput molecular docking, molecular dynamics, machine learning, and DFT study   

   By J. Kashyap and D. Datta

   Part of special issue on 'Computational Materials Design' in Journal of Materials Science 

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.

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

G. Azizi, S. Kavousi, and M. Asle Zaeem. Interactive effects of interfacial energy anisotropy and solute transport on solidification patterns of Al-Cu alloys. Acta Materialia 231 (2022) 117859 (15 pages). 

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

Abstract

Journal: Mathematics and Mechanics of Solids

Dear colleagues,