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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

 

Request to physicists: Would you be willing to provide some informal feedback on my new approach to QM?

I have a request to make to physicists: Would they be willing to provide some informal feedback on my new approach to QM?

Please see the small PDF document, here [^]. Please circulate it to physicists you know, especially those from academia.

Thanks in advance.

 

Mirkhalaf's picture

[Polymers] Special Issue: Mechanics of 3D-Printed Polymers and Polymer Composites

A special issue on "Mechanics of 3D-Printed Polymers and Polymer Composites", is recently launched in the journal "Polymers". If your research is related to the topic, I would like to invite you to submit your latest research developments to the special issue. For more details and submitting your manuscript, please see: 

https://www.mdpi.com/journal/polymers/special_issues/Mech_3D_Print_Polym...

 

Fan Xu's picture

Buckling of an elastic layer based on implicit constitution: Incremental theory and numerical framework

A general class of implicit bodies was proposed to describe elastic response of solids, which contains the Cauchy–Green tensor as a function of Cauchy stress. Here, we consider the buckling of solids described by such a subclass of implicit constitutive relation. We present a general linear incremental theory and carry out bifurcation analysis of a uniaxially compressed rectangular layer described by an implicit constitution.

Teng Li's picture

EML Webinar (Season 2) on 15 September 2021 by Xavier Trepat on engineering the shape and mechanics of cellular monolayers

EML Webinar (Season 2) on 15 September 2021 will be given by Xavier Trepat on engineering the shape and mechanics of cellular monolayers. Discussion leader: Andrej Kosmrlj, Princeton University

Time: 9 am Boston, 2 pm London, 9 pm Beijing on 15 September 2021

Antonio Papangelo's picture

Viscoelastic normal indentation of nominally flat randomly rough contacts

Viscoelastic materials are receiving increasing attention in soft robots and pressure sensitive adhesives design, but also in passive damping techniques in automotive and aerospace industry. Here, by using the correspondence principle originally developed by Lee and Radok and further extended by Ting and Greenwood, we transform the elastic solutions of Persson for contact of nominally flat but randomly rough surfaces to viscoelastic indentation. As an example, the cases of step loading and of the response to a single cycle of harmonic loading are studied.

arash_yavari's picture

Universal Deformations in Inhomogeneous Isotropic Nonlinear Elastic Solids

Universal (controllable) deformations of an elastic solid are those deformations that can be maintained for all possible strain-energy density functions and suitable boundary tractions. Universal deformations have played a central role in nonlinear elasticity and anelasticity. However, their classification has been mostly established for homogeneous isotropic solids following the seminal works of Ericksen. In this paper, we extend Ericksen's analysis of universal deformations to inhomogeneous compressible and incompressible isotropic solids.

Antonio Papangelo's picture

On the Interaction of Viscoelasticity and Waviness in Enhancing the Pull-Off Force in Sphere/Flat Contacts

Motivated by roughness-induced adhesion enhancement (toughening and strengthening) in low modulus materials, we study the detachment of a sphere from a substrate in the presence of both viscoelastic dissipation at the contact edge, and roughness in the form of a single axisymmetric waviness. We show that the roughness-induced enhancement found by Guduru and coworkers for the elastic case (i.e. at very small detachment speeds) tends to disappear with increasing speeds, where the viscoelastic effect dominates and the problem approaches that of a smooth sphere.

Comparative Biomechanics of Hagfish Skins & Planar Biaxial Testing

In the recently published paper by the Department of Biology at College of Charleston and at Valdosta State University, researchers measured the material properties of hagfish skin and compared histological data from the skins of four hagfish species. Skin samples were subjected to uniaxial and biaxial tensile testing to study their strength, stiffness, and extensibility. ADMET eXpert 8600 Planar Biaxial testing system was used to conduct planar biaxial tests.

SwarnavaGhosh's picture

Precipitation during creep in magnesium-Aluminum alloys

Dear Colleagues,

I am writing to share with you my article titled, "Precipitation during creep in magnesium-aluminum alloys" , which has been published in the journal Continuum Mechanics and Thermodynamics. 

Lightweight magnesium-aluminum alloys show significant tension-compression asymmetry under creep loading. This work offers an explanation of this phenomenon.

Link to the article: https://rdcu.be/ct4zi

Zhaohe Dai's picture

Elastocapillary cleaning of twisted bilayer graphene interfaces

Dear iMechanicians, I would like to share our recent work on a drop confined by two adhesive graphene sheets (as illustrated below). 

Fig. 1

Amit Acharya's picture

Variational principles for nonlinear pde systems via duality

Amit Acharya

A formal methodology for developing variational principles corresponding to a given nonlinear
pde system is discussed. The scheme is demonstrated in the context of the incompressible
Navier-Stokes equations, systems of first-order conservation laws, and systems of Hamilton-
Jacobi equations.

Amit Acharya's picture

An action for nonlinear dislocation dynamics

Amit Acharya

An action functional is developed for nonlinear dislocation dynamics. This serves as a first step
towards the application of effective field theory in physics to evaluate its potential in obtaining
a macroscopic description of dislocation dynamics describing the plasticity of crystalline solids.
Connections arise between the continuum mechanics and material science of defects in solids,
effective field theory techniques in physics, and fracton tensor gauge theories.

Luca-Deseri's picture

Mechanotropism of single cells adhering to elastic substrates subject to exogenous forces

Adherent cells are able to actively generate internal forces, channeled by cytoskeletal protein filaments and transmitted through transmembrane receptors to the surrounding environment by means of focal adhesions.

Luca-Deseri's picture

Uniaxial stretch-release of rubber-plastic bilayers: strain dependent transition to stable helices, rolls, saddles, and tubes

Polymeric plastics deform irreversibly (i.e., inelastically) whereas rubbers deform reversibly, i.e., elastically.

Thus, uniaxially stretching a rubber-plastic bilayer composite beyond its yield point can create an elastic strain mismatch between the two layers. Upon release, the bilayer may then bend out-of-plane.

Luca-Deseri's picture

Bulky auxeticity, tensile buckling and deck-of-cards kinematics emerging from structured continua

Complex mechanical behaviours are generally met in macroscopically homogeneous media as effects of inelastic responses or as results of unconventional material properties, which are postulated or due to structural systems at the meso/micro-scale.

Examples are strain localization due to plasticity or damage and metamaterials exhibiting negative Poisson’s ratios resulting from special porous, eventually buckling, sub-structures.

Meredith N. Silberstein's picture

Journal Club for August 2021 - Electromechanics of Polyelectrolytes

Meredith Silberstein and Max Tepermeister

Cornell University, Sibley School of Mechanical and Aerospace Engineering

 

Nuwan Dewapriya's picture

Molecular‑level investigation on the spallation of polyurea

 

 

 

Our paper "Molecular‑level investigation on the spallation of polyurea" is freely available from this link: https://rdcu.be/cqkbG

We used molecular dynamics (MD) simulations to investigate the nanoscale mechanism associated with the spallation of polyurea, which allowed us to test some assumptions commonly made in the interpretation of similar experiments on the macroscale. 

mohammedlamine's picture

Efficient Constant Strain Tetrahedron Shape Functions

Dear researchers,

Hi all,

I am pleased to post my following publication:

Study on Dynamic Detection of Reinforced Concrete Bridge Damage by Finite Element Model Updating

 

How can solid ice be tested in laboratory environment (mechanical testing)?

Below is a blog post based on equipment that we have built for testing solid ice samples. We designed an ADMET biaxial testing system (eXpert 8600 series) in collaboration with the Rock and Ice Deformation Laboratory (RIDL) at Woods Hole Oceanograhic Institution (WHOI). 

Test Application

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