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Stretching and Spin Tensors Relations

Submitted by Hamad on
education

Can someone help me to understand this please:

The stretching tensor (D) is the symmetric part of the velocity gradient (L), and if I derive D from L with using the polar decomposition of the deformation gradient (F=RU) I get the relation:

D=0.5 R (Udot Uinv + Uinv Udot) R' ----(Eq.1) where Udot is the time derivative of U, Uinv is the inverse of U, and the prime indicates the tranpose of the matrix.

Problem with Abaqus subroutine first increment

Submitted by Aitor Cruzado on

Hi everybody,

I´m working with umeshmotion subroutine, and Ihave one question.

Once I have submited the job and the subroutine, I can check that the nodes doesn´t move on the first increment in the subroutine´s step (the movement starts on the second increment), but in the .msg file I can see that the calculations has been made in the first increment.

Does anybody knows the reason?

Thanks in advance.

TECHNOLOGY LEADER (CENTRE DIRECTOR)

Submitted by Deirdre_Murphy on
job

TECHNOLOGY LEADER (CENTRE DIRECTOR) 

Competence Centre for Composite Materials 

A Competence Centre for composite materials research is to be established at UL, with support from Enterprise Ireland and IDA Ireland. The Centre will conduct innovative, high quality research in the use of composite materials with direct relevance to industry.  Applications are invited for the position of Technology Leader (Centre Director) 

difference between elastic limit and proportional limit

Submitted by sagar_009 on

hi all,

can anyone explain about the following basic questions

1. me the difference between the proportional limit and elastic limit.

   Please dont give the definitions of both, i need some detailed explaination.

 2. How many natural frequency a object can have?

Regards

sagar

On the cover of the NSF 2011 Congressional Budget Request

Submitted by Teng Li on
research

The research on stretchable and twistable electronics by Yonggang Huang at Northwestern University and John A. Rogers at the University of Illinois at Urbana- Champaign has been featured on the cover of the NSF Budget Request to the United States Congress for the fiscal year 2011.

Details available at http://www.nsf.gov/about/budget/fy2011/cover_caption.jsp

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