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Welcome to Contact Mechanics Forum

George G Adams's picture

Welcome to a new forum on iMechanica which is specifically designed as a "Contact Mechanics Forum". You do not need to register to view the postings on this forum, but you must register (it's free) in order to post something. The posting can be an idea, an announcement of an upcoming conference, an announcement of a journal article (see node/265), the pdf of the manuscript form of the paper can be posted in many cases (see http://romeo.eprints.org/ for a list of journals which permit it), or almost anything related to contact mechanics.

Our forum should be interested in discussing briefly new results, key unsolved problems, open research directions, new avenues, and involve all areas in contact mechanics such as contact elasticity, plasticity, indentation testing, adhesion, friction models, interfacial phenomena in MEMS, nanocontacts, rolling contact fatigue, fretting fatigue, corrugation, and wear. Also if anyone has topics to upload, or notes, or even worked examples or teaching exercise, please feel free to add this material to the forum.

Please use your full name to register for a free account(user/register). It will take you about one minute. You will then receive an email that contains the password which you can use to sign on.

Best wishes,

Mike Ciavarella, George Adams, and Jim Barber

Sir, is there any literature which explains the contact forces during a rolling of

sphere(Ball) and cylindrical surface contact ( Shaft) . 

I want to model the shot peening process using FE method. there i come across one concept called HOURGLASSING. I am not able to undersatand its significance. Pl send me the details sir.

It's a wonderful idea to set a contact mechanics forum.as we know, contact problems in FEA is very difficult.My daily tasK is to calculate the mechanical strenth with contact for plastic composite. How to make it convergent is a big challenge for me.Our analyse objects are toys,so the geometry character is very abnormal,exsiting so many small faces,small edges,etc. Abaqus is a very excellent software,i believe it can solve our problem if i know it furtherly,not settling on the superficial.

searching for the guys who work with me in the same background,we can share and get more progress.TKS.

looking forward to see your good article.

my email:fangfang8301@126.com

2008eml's picture

I wanat to know if you have any review paper about propagation of elastic waves through a frictional and frictionless(with slip) contact interface beetween to solid media. I'd be so pleased if you could send me some papers or get me some view about.

There are many papers on this by Dundurs and Comninou from around 1980. For example:-

Title: ENERGY RELATIONS FOR SH-WAVES INTERACTING WITH A FRICTIONAL CONTACT INTERFACE

Author(s): CHEZ EL, DUNDURS J, COMNINOU M
Source: INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES   Volume: 19   Issue: 7   Pages: 579-586   Published: 198
Title: INTERACTION OF ELASTIC-WAVES WITH A UNILATERAL INTERFACE

Author(s): COMNINOU M, DUNDURS J

Source: PROCEEDINGS OF THE ROYAL SOCIETY OF LONDON SERIES A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES   Volume: 368   Issue: 1732   Pages: 141-154   Published: 1979

Title: TOTAL REFLECTION OF SH-WAVES IN THE PRESENCE OF SLIP AND FRICTION

Author(s): COMNINOU M, DUNDURS J, CHEZ EL
Source: JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA   Volume: 66   Issue: 3   Pages: 789-793   Published: 1979

Title: SINGULAR REFLECTION AND REFRACTION OF ELASTIC-WAVES DUE TO SEPARATION

Author(s): COMNINOU M, DUNDURS J

Source: JOURNAL OF APPLIED MECHANICS-TRANSACTIONS OF THE ASME   Volume: 45   Issue: 3   Pages: 548-552   Published: 1978

Title: REFLECTION AND REFRACTION OF SH-WAVES IN PRESENCE OF SLIP AND FRICTION

Author(s): CHEZ EL, DUNDURS J, COMNINOU M
Source: BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA   Volume: 68   Issue: 4   Pages: 999-1011   Published: 1978

Title: ELASTIC INTERFACE WAVES AND SLIDING BETWEEN 2 SOLIDS

Author(s): COMNINOU M, DUNDURS J

Source: JOURNAL OF APPLIED MECHANICS-TRANSACTIONS OF THE ASME   Volume: 45   Issue: 2   Pages: 325-330   Published: 1978

Title: REFLECTION AND REFRACTION OF ELASTIC-WAVES IN PRESENCE OF SEPARATION

Author(s): COMNINOU M, DUNDURS J

Source: PROCEEDINGS OF THE ROYAL SOCIETY OF LONDON SERIES A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES   Volume: 356   Issue: 1687   Pages: 509-528   Published: 1977

Title: ELASTIC INTERFACE WAVES INVOLVING SEPARATION

Author(s): COMNINOU M, DUNDURS J

Source: JOURNAL OF APPLIED MECHANICS-TRANSACTIONS OF THE ASME   Volume: 44   Issue: 2   Pages: 222-226   Published: 1977 

i have what i supose to be an easy optimization problem to do it with ANSYS. it is a plate (1.75mx1.75m) with 4 holes wich i need to determine the optimum location (x,y) and radius (R)  to minimize the maximum Von Mises straining (SQV). Constraint: 0.04m<Ri<0.2m; Af>0.08*1.75*1.75. Af is the total area of holes and Ri his respective radius. P1=P2= 1200N/m. Material Steel: E=200GPa, v=0.29

 

Please some one help me until: thursday, 14.05.2009

Thank you. 

plate with 4 holes

flong208's picture

Hello, dear G Adams 

     I am a mechanical engineering students, not a mechanician.But my research concerned greatly with contact mechanics.

     Recently, I'm thinking about this problem:common engineering processes such as shot peening, ion implantation, deep rolling and case hardening introduce graded surface to machine elements in a controlled manner, especially hardening case or induction hardening are often used to modify the surfaces of many machine element, such as bearings and gears. But, in finite element analysis of the  contact, the effects of these modified surface are rarely considered. Because the elastic modulus remains the same(will it change? I have not find any literature that say it will change), the effect of hardened(modified) surface find no way to included in FEA.

   My question is: is it worth to consider this problem? can you kindly give me some advice?

 

Can any one give me approximate values of thermal and electrical contact conductance between steel and steel contact, steel and copper contact.

Also what steps should be taken if contact simulation is not converging.

thanx

ashutosh

hi

 i want to get gap distance for contact elements along a specfic path but ansys don't do this.

any body could help?

thanks 

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