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adhesion

Mike Ciavarella's picture

A recent PNAS paper explained! FRACTURE MECHANICS SIMPLE CALCULATIONS TO EXPLAIN SMALL REDUCTION OF THE REAL CONTACT AREA UNDER SHEAR

If you have seen the very nice PNAS paper which just appeared

Sahli, R., Pallares, G., Ducottet, C., Ben Ali, I.E., Al Akhrass, S., Guibert, M., Scheibert, J., 2018, Evolution of real contact area under shear, Proceedings of the National Academy of Sciences, 115(3), pp. 471-476.

Here we provide a simple explanation.

FACTA UNIVERSITATIS

Series: Mechanical Engineering

DOI: 10.22190/FUME180108007C

Short Communication

FRACTURE MECHANICS SIMPLE CALCULATIONS TO EXPLAIN SMALL REDUCTION OF THE REAL CONTACT AREA UNDER SHEAR

UDC 539.6

Partial constraint singularities in elastic rods

We present a unified classical treatment of partially constrained elastic rods. Partial constraints often entail singularities in both shapes and reactions. Our approach encompasses both sleeve and adhesion problems, and provides simple and unambiguous derivations of counterintuitive results in the literature. Relationships between reaction forces and moments, geometry, and adhesion energies follow from the balance of energy during quasistatic motion. We also relate our approach to the configurational balance of material momentum and the concept of a driving traction.

Mike Ciavarella's picture

An inspiring seminar by Prof. Huajian Gao -- Mechanics as an Enabling tool in bioinspired materials and biological interactions of nanomaterials

Professor Huajian Gao of Brown University speaks at MIT Distinguished Seminar Series (March 2016).

It is a unique opportunity to enjoy the many important recent achievements of Huajian's group.

Mechanics as an Enabling tool in bioinspired materials and biological interactions of nanomaterials

Here.

Not to be missed!

Mike Ciavarella's picture

Some Closed-Form Results for Adhesive Rough Contacts Near Complete Contact on Loading and Unloading in the Johnson, Kendall, and Roberts Regime

Michele Ciavarella  Yang Xu Robert L. Jackson

Some Closed-Form Results for Adhesive Rough Contacts Near Complete Contact on Loading and Unloading in the Johnson, Kendall, and Roberts Regime

Journal of Tribology Copyright VC 2018 by ASME JANUARY 2018, Vol. 140 / 011402-1

 

Recently, generalizing the solution of the adhesiveless random rough contact proposed

by Xu, Jackson, and Marghitu (XJM model), the first author has obtained a model for

adhesive contact near full contact, under the Johnson, Kendall, and Roberts (JKR)

Mike Ciavarella's picture

A very simple estimate of adhesion of hard solids with rough surfaces based on a bearing area model

"A very simple estimate of adhesion of hard solids with rough surfaces based on a bearing area model" is in press in Meccanica, can be viewed at http://rdcu.be/s0lV Abstract In the present note, we suggest a single-line equation estimate for adhesion between elastic(hard) rough solids with Gaussian multiple scales of roughness.

Mike Ciavarella's picture

On Pastewka and Robbins' Criterion for Macroscopic Adhesion of Rough Surfaces

On Pastewka and Robbins' Criterion for Macroscopic Adhesion of Rough Surfaces

M. Ciavarella

[+] Author and Article Information

J. Tribol 139(3), 031404 (Nov 30, 2016) (5 pages)

Paper No: TRIB-16-1057; doi: 10.1115/1.4034530

History: Received February 15, 2016; Revised July 18, 2016

ARTICLE

REFERENCES

Abstract

Abstract | Introduction | A Simple Asperity Model | Pull-Off | Discussion | Conclusion | References

linst06's picture

Fringe Instability in Constrained Soft Elastic Layers

Soft elastic layers with top and bottom surfaces adhered to rigid bodies are abundant in biological organisms and engineering applications. As the rigid bodies are pulled apart, the stressed layer can exhibit various modes of mechanical instabilities. In cases where the layer’s thickness is much smaller than its length and width, the dominant modes that have been studied are the cavitation, interfacial and fingering instabilities.

Xuanhe Zhao's picture

Tough Soft Wet Adhesion

Tough bonding of hydrogels to diverse non-porous surfaces

Hyunwoo Yuk, Teng Zhang,Shaoting Lin, German Alberto Parada & Xuanhe Zhao

Nature Materials (2015) doi:10.1038/nmat4463

A design strategy for tough bonding of hydrogels to diverse solids.

Cai Shengqiang's picture

wet adhesion between two soft layers

Two solids can adhere to each other in the presence of a liquid bridge between them, which is called wet adhesion. When the solid is soft, the liquid bridge can cause deformation in the material, and in turn, the deformation may have dramatic effects on the wet adhesion. To investigate the effect, in this article, we calculate the deformation in two soft layers with different separations and connected by a liquid bridge. We illustrate the effect of deformation in the soft layers on the adhesive force.

ahmedettaf's picture

Call for Abstracts; EMI 2015 Stanford

Dear colleagues,

We cordially invite you to submit your contributions to the following minisymposium: Multiscale Modeling and Simulation of Fracture and Fragmentation Processes taking place as part of the Engineering Mechanics Institute conference (JUne 16-19, 2015) at Stanford.

Best Regards,

Ahmed Elbanna*, University of Illinois at Urbana Champaign, USA
Glaucio Paulino, University of Illinois at Urbana Champaign, USA

MS 54: Multiscale Modeling and Simulation of Fracture and Fragmentation Processes

ahmedettaf's picture

MM&FGM14: 13th International Conference on Multiscale Modeling and Functionally Graded Materials

Dear Colleagues,

Please consider submitting an abstract to the 13th Internation conference on Multiscale Modeling and Functionally Graded Materials to be held on October 19-22, 2014; in  Taua Resort, SP, Brazi. More information about the conference could be found here:

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Mike Ciavarella's picture

a JKR theory of adhesion for anisotropic solids

Jim Barber and I just got accepted this paper in JMPS, and it is also already available on Arxiv.  We found a remarkably simple closed form solution for adhesion on orthotropic materials in the planes of symmetry.  This shows adhesion can increase significantly due to anisotropy, namely the JKR solution continues to hold in the sense of mean elastic modulus, but the prefactor can grow without limit. We expect applications in crystals indentation, but also in locomotion in biological world.

 

ahmedettaf's picture

17 th National Congress on Theoretical and Applied Mechanics June 15-20 (Michigan State University)

Dear all,

I would like to bring to your attention the following minisymposium that is organized as part of the NCTAM 17 (Michigan State University, June 15-20, 2014)

http://www.usnctam2014.org/minisymposium/friction-adhesion-and-fracture-...

 

Friction, Adhesion and Fracture: From microscale physics to macroscale response

Rui Huang's picture

Journal Club Theme of March 2013: Interfacial Adhesion of Graphene - Measurements and Analysis

Several recent papers have reported measurements of adhesion energy between graphene and other materials (e.g., Si/SiOx and copper) [1-3]. Like thin films, many experimental methods may be adopted to measure the interfacial properties of graphene, such as the pressurized blister test [2] and the double-cantilever beam test [3]. The challenges lie in the handling of atomically thin membranes and analysis/interpretation of the data.

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