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contact mechanics

Dr. Hanaor - Department of Ceramic Materials - TU Berlin's picture

Electrical contact resistance and its dependence on applied pressure

The relationships between surface roughness, contact pressure and contact resistance are studied in this work published three years ago.

It is imporant to distinguish between the different conduction mechanisms acting at contacts at different scales, in order to better understand how surface structure and surface chemistry can alter the behaviour of electrical contacts

miquel.aguirre's picture

1 PhD position in Real time Solid Mechanics & 3D Printing - Marie Curie ITN project Meditate - ESR03

1 Early Stage Researcher (ESR) PhD position in biomechanics offered within the framework of the project MeDiTATe (The medical digital twin for aneurysm prevention and treatment) funded by the European Union’s Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie Actions (MSCA) Innovative Training Networks (ITN) with Grant Agreement No. 859836. MeDiTATe is a European Industrial Doctorate (EID).

Dr. Hanaor - Department of Ceramic Materials - TU Berlin's picture

Contact stiffness of rough surfaces

Contact stiffness of multiscale surfaces by truncation analysis


In this concise piece of work, an effective method is shown to gain new understandings into the role of surface structure in the field of contact mechanics. In particular, normal contact stiffness is correlated to parameters of surfaces' fractal dimension and amplitude. 

marco.paggi's picture

New book on Modeling and Simulation of Tribological Problems in Technology, CISM series, Springer

The new book "Modeling and Simulation of Tribological Problems in Technology" (CISM book series, Springer) has been published:

Editors: Paggi, Marco (IMT School for Advanced Studies Lucca, Italy), Hills, David (University of Oxford)

Main contributing authors, lecturers of the CISM course D.A. Hills, J.R. Barber, M. Paggi, D. Dini, A. Almqvist 

(closed) PhD position in biomechanics, University of Sheffield

The following position is not longer available


Applications are solicited for a PhD position, based at the Insigneo Institute for in silico Medicine, University of Sheffield, UK, starting October, 2019.

Application deadline: January 23, 2019

Fully-funded scholarships are available on a competitive basis. 

Please see the attachment for further details regarding the position and the application process. 

marco.paggi's picture

Advanced course on contact mechanics and tribology @ CISM, Italy

Dear Colleague,


this is a gentle reminder about the CISM course:


"Modelling and Simulation of Tribological Problems in Technology"  

Udine, May 28 - June 1, 2018


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

Kenneth Langstreth Johnson. 19 March 1925 — 21 September 2015

I strongly recommend reading these two papers about the recent loss of Ken L Johnson, FRS, Timoshenko Medallist, Gold Tribology Medal, who died the day of my 45th birthday, exactly twice as old.

Rod Smith Biographical Memoirs of Fellows of the Royal Society · August 2016 Kenneth Langstreth Johnson. 19 March 1925 — 21 September 2015 DOI: 10.1098/rsbm.2016.0012   

Hills, D. A., Nowell, D., & Barber, J. R. (2016). KL Johnson and contact mechanics. Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, 0954406216634121.

marco.paggi's picture

CISM course ''Modelling and Simulation of Tribological Problems in Technology''

Advanced Course at the International Centre for Mechanical Sciences (CISM, Udine, Italy)


Modelling and Simulation of Tribological Problems in Technology

May 28, 2018 — June 1, 2018 


Marco Paggi (IMT School for Advanced Studies Lucca, Lucca, Italy)

David A. Hills (University of Oxford, Oxford, Great Britain)

marco.paggi's picture

Contact in soft tissues

Dear Colleague,  the III International Conference on Biomedical Technology (ICBT 2017, an Eccomas conference) will be held in Hannover (Germany) from November 6th to 8th, 2017.

marco.paggi's picture

Mini-symposium at ICF14 on "Fracture and contact in multiphysics problems: from energy to biological applications"

Dear Colleague,

I kindly inform you that, in the framework of the 14th International
Conference on Fracture (ICF14), to be held in Rhodes, Greece, June 18-23,
2017, we are organizing a mini-symposium on "Fracture and contact in
multiphysics problems: from energy to biological applications".

If you are interested, please submit your two-page abstract through the
ICF14 website ( by October 31, 2016, selecting our

Eran Bouchbinder's picture

Dynamic instabilities of frictional sliding at a bimaterial interface

Understanding the dynamic stability of bodies in frictional contact steadily sliding one over the other is of basic interest in various disciplines such as physics, solid mechanics, materials science and geophysics. Here we report on a two-dimensional linear stability analysis of a deformable solid of a finite height H, steadily sliding on top of a rigid solid within a generic rate-and-state friction type constitutive framework, fully accounting for elastodynamic effects.

ACM2015 : International Conference on Advances in Applied and Computational Mechanics ,5-7 August 2015, Izmir/Turkey

We are proud to announce International Conference on Advances in Applied and Computational Mechanics, which is organized in the honor of  70th birthday of Prof.J.N.Reddy. This is a tribute for his many and lasting contribution to education and research in applied mechanics.


Conference will be held at  WYNDHAM GRAND Hotel, Inciralti Izmir/Turkey during August 5-7, 2015. 

marco.paggi's picture

MUSAM - Multi-scale Analysis of Materials - Annual report 2014

Dear Colleague,


I would like to inform you that the annual report on the scientific and educational activities carried out by the research unit MUSAM on Multi-scale Analysis of Materials at IMT Lucca during 2014 can be downloaded from the following link:


Vladislav Yastrebov's picture

PhD position in computational contact mechanics

We are looking for a student to work on the topic "Development of advanced numerical methods in contact mechanics for aerospace applications"

marco.paggi's picture

EUROMECH Colloquium 575 on Contact Mechanics and Coupled Problems in Surface Phenomena

Dear Colleague,
  we would like to inform you that the EUROMECH Colloquium 575 on “Contact Mechanics and Coupled Problems in Surface Phenomena” will take place in the IMT Institute for Advanced Studies Lucca (Lucca, Italy) from March 30, 2015 to April 2, 2015.  

Have someone met a strange behavior of Load-Displacement curve in a simple 2D indentation problem

I am modelling a very simple 2D contact problem between a rigid wedge indenter and a deformable squared-shape specimen (general steel material) in frictionless contact case. I used an implicit function f to describe the rigid indenter.

I implemented Lagrange multiplier method for this contact problem and the contact condition is: Inside the contact zone of the deformable specimen, the node set is active if f(node)<=0 and the Lagrange multiplier lambda<=0.

Can someone explain the strange physical behavior in contact problem using Lagrange method in modeling a simple 2D indentation?

I am modelling a very simple 2D contact problem between a rigid indenter and a deformable squared-shape specimen. I used a implicit function f to describe the rigid indenter. 
The contact condition is: Inside the contact zone of the deformable specimen, a node n is outside of rigid indenter for f(n)>0, and inside for f(n)<0. In case f(n)=0, the contacting node lies on the surface of the rigid body.

Large deformation spherical (hertz) contact simulation

Free Tags: 

Hello Everyone,

I am simulating contact of a sphere with a soft elastomer (Hertz contact). Unlike the hertz contact, I will like to simulate large deformations. My model is a 2D axisymmetric model and the load is displacement controlled. The current model fails at total time/freq ~ 0.84. I have tried refining my mesh and have reduced the increment size and increased the number of increments. Currently, step my parameters are:

 Max. number of increments: 200000 and Increment size:0.005/1E-5/0.01

 Nlgeom is On because of the large deformation.


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