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  Dear everyone

  If we considerer a 3D fracture stress and strain field as a combination of numerous 2D fields in thickness direction, the J integral at each 2D plane can be obtained according to Rice’s definition (Abaqus and Ansys also include this function). What I concerned is the ratio of J integral at the surface of SEB or CT specimen to that at the mid-plane of the specimen. What factors have influence on the ratio? How to find the quantitive relationship between the factors and the ratio in linear elastic model?

Worth reading

 http://www.dpmms.cam.ac.uk/~wtg10/continuity.html

in case you need to explain the epsilon-delta  definition of continuity to an engineering student.

-- Biswajit 

The Department of Mechanical Engineering at the Universitat Rovira i Virgili (URV) (www.urv.cat) in Tarragona (Spain), is looking for several enthusiastic research students with a strong interest in fluid dynamics. Successful candidates will join a small but very active multidisciplinary team, working in fluid-structure interaction problems. The research will be mainly experimental and focused in the area of fluid structure interaction with application to several engineering problems.

I would like to know why ABAQUS is the dominant FEM program (in terms of comments) in this forum? Why do you consider ABAQUS over ANSYS?

I have been using ANSYS for at least 8 years and I am very please with the capabilities of it. But I have not seen ABAQUS or used it. Beside, reading all the comments that are posted in imechanica, I feel like I am using the wrong FEM program. 

Which are the advantage of ABAQUS over ANSYS?

Thank you,

 Mario J . Juha

Hello,

I'm new in this forum and I've a problem that i can't resolve.

I need to model nitinol in Abaqus: I've red the documentation and many topic in Internet but I don't understand if I must use a VUMAT subrutine or it is sufficent the tool of user defined material in Abaqus/CAE. I need something simple like an elastoplatic behaviour with hysteresis given by the different states of austenite and martensite.

Thanks in advance,

 Jam3s

Attention all iMechanicians!  If you have a theme you would like to see in the Journal Club next year, please feel free to:

1. post it here for discussion
2. send it to me via email
3. reccommend discussion leaders

Thanks in advance!

Let us consider interaction of two atoms/molecules/particles. The reference distance between them corresponds to zero interaction force and zero stored energy. The interaction passes three stages with the increase of the distance. At the first stage the force increases proportionally to the increasing distance: the linear stage. At the second stage the force-distance relationship deviates from the linear proportionality: the nonlinear stage. At the third stage the force drops with the increasing distance: the separation or failure stage.

The Congress will be held on 27 June – 2 July 2010, at the Pennsylvania State University.  The deadline for submitting abstract is 15 October 2009.