Hi everyone,

    I have a question about the objectivity tensor in ABAQUS software. Below is my question.   

There are several  fully funded graduate student openings in the Department of Mechanical and Aerospace Engineering at the Utah State University (http://www.mae.usu.edu). The openings are in the broad area of Computational Solid Mechanics. In particular, applicants having demonstrated interest (in terms of completed projects, authorship in journal articles or coursework) in Fracture Mechanics are especially invited.

The number of registered users of iMechanica exceeded 10,000 the other day.  The total number of posts is 4379, and the total number of comments 9222.  iMechanica was launched in September 2006, with the following mission:

Colleagues, can I draw your attention to the following position. Closing date is 5th December. If you want to know more about the post or the department feel free to contact me.

Thanks, Charles

Lecturer in Bioengineering

School of Engineering, Durham University, UK

Hi all!

I read that the "cmplementary starin energy of a structure is not equal to sum of the complementary strain energies of it's components, if there is non-linearity like geometric"

That means for e.g. if I consider a truss stucture subjected to loading so that it undergoes geometric non-linearity, then the sum of the complementary strain energies from members is not equal to complementary strain energy of the structure.

 I request somebody to explain why is it so??

 Thanks and regards,

- Ramdas

Checking the iMechanica web, I notice some discussion about the Cauchy stress tensor, whether it is covariant or contravariant.  Well, a tensor is neither covariant nor contravariant, while it can be expressed by its covariant, contravariant, or mixed *components* with respect to any arbitrary coordinate system. See the attached short explanation.