# contact mechanics

## A generalized Johnson parameter for pull-off decay in the adhesion of rough surfaces

Article in Physical Mesomechanics · December

Authors: Michele Ciavarella, Antonio Papangelo

## Fracture Mechanics implications for apparent static friction coefficient in contact problems involving slip-weakening laws

Article in Proceedings of The Royal Society A 471(2180) · July 2015 DOI: 10.1098/rspa.2015.0271

http://rspa.royalsocietypublishing.org/content/471/2180/20150271.article...

## 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.

## 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:

## 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

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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.

Hello Everyone,

I have been working on solving contact problems relating to fibrillar adhesives over the past 3 yrs of my PhD work. In the past, I used Comsol FEM to model contact interactions by implementing the Dugdale-Barenblatt traction separation law at the contact interface.

## Next CONTACT-course in december 2013

Dear all,

On Tuesday December 3rd to Thursday December 5th, 2013, we will organise a course on rolling contact mechanics using the CONTACT software at Delft University of Technology in the Netherlands.

The aims of the course are:

## Frictional rolling contact model CONTACT version 13.1 released

Dear all,

Herewith I want to announce the release of the frictional rolling contact model CONTACT version 13.1.

The main changes with respect to earlier versions of the program are as follows:

## Post-doc position at the TU Braunschweig within ERC StG "INTERFACES"

One Post-Doc position is now available at the Institut für Angewandte Mechanik of the Technische Universität Braunschweig, Germany, within the ERC Starting Researcher Grant "INTERFACES". The position is a full-time fixed-term position for 2 years with the possibility of renewal.