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remove an entry

dear imechanica 

   I wanted to remove one entry but I don't seem to be able to remove entries any longer like it was possible before --- how can I do that?


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rate-state dependent friction in ANSYS

Dear collegues

a quick question:- I am playing with continuum models of Contact (Hertz, Westergaard and so on) and friction laws. However, I prefer for my students to use ANSYS FEM code. In Ansys there is standard Coulomb, rate-dependence but not rate-state (unless one codes some user subroutines). See

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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.


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How safe are metal-on-metal hip implants? and are ceramic-on-ceramic safer? Or we will discover soon they are not?

Would you believe this story?

To me, that metal - on - metal had large friction, especially with the newest designs, it was clear from the old Sir Charnley studies in Leeds in 1950s published in his gold book. 

Anyway, when I looked at ceramic on ceramic joints, I also found evidence of increased friction.  Maybe ceramic debris is less toxic?

Please comment.  What can we do outside USA to improve the situation?

Michele Ciavarella 

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1st International IEEE Workshop on Metrology for Aerospace. Benevento, Italy, May, 29-30, 2014.

Dear Colleagues and Friends,

We are pleased to invite you to contribute to the 1st International IEEE Workshop on Metrology for Aerospace. 

The event is co-technical sponsored by two IEEE Societies, AESS and IMS. 
The event includes but is not limited to new technology for metrology-assisted production in aerospace industry, aircraft component measurement, sensors and associated signal conditioning for aerospace, calibration methods for electronic test and measurement for aerospace.

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URGENT: phd position in the group of Prof Bigoni (Trento, Italy) with possible sharing with us in PoliBA


I received this letter from Prof Davide Bigoni

Marie Curie PhD position at University of Trento (Italy): deadline September 15

It is a top opportunity in Italy, the leading group in Italy in elasticity, plasticity and nonlinear elasticity. A very active university and town. 

I expect many applications.

 prof. MC

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Given the complexity of present and
future global challenges, it is the university´s social responsibility
to contribute to society by understanding the full extent of its needs
and current and future problems, and to prepare it to deal with them
effectively and efficiently (CMES, 2009)1. In this sense, due to its
ability to take the lead in matters of knowledge creation, promotion and
dissemination, the university becomes the ultimate guidance governments

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Wear-out models for composite materials fatigue, and the "strange case" of Kassapoglou's "too good to be true" model

Wear-out models have been very successful for fitting probabilistic SN
curves of composite materials.  The "strength-life equal rank
wear-out models for fatigue of composite materials were
first presented by Hahn and Kim [1], and later as a fitting approach to fatigue
data by Sendeckyj [2].

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sad news for mechanician. Departure of HD Bui, member of french academy of science

Unfortunately, HD Bui, 76, passed away yesterday evening. An elegant, dedicated, very discreet but bright mind, HD Bui made a long career at Ecole Polytechnique and EDF, making important contributions in fracture mechanics and inverse engineering.  Lately, he returned to work on his interesting contributions on the Cheops pyramid and the spiralling internal structure.

He was considered the most prominent vietnamese scientist in France, of 400 000 living there.

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retirement age or discrimination? Nature speaks of "sticking" around, but in europe we have new laws

In January 2011, the UK government announced its intention to stop
compulsory retirement for people aged 65, despite criticism of the move
by employers’ groups. Campaigners against age discrimination and unions
welcomed the change. However, official guidance makes it clear that
employers will be able to dimiss staff no longer capable of carrying out
their work. Official figures show more than two thirds of British
employers have already eliminated fixed retirement ages.

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9 PhD positions in Mechanical Engineering at Politecnico di BARI - Italy


Dealine is 26 January 2012 at 13.00.   ATTACHED YOU FIND ALL THE NEEDED DOCUMENTS!  Which you find also here .

We have 9 positions available starting between Jan and March 2012 on various themes of mechanical and management engineering at Politecnico di BARI .

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Mechanics of love and happiness

An interesting application of non linear dynamics, including happiness with a simple 1D damped oscillator!


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