Blog posts

post-doc in dislocation modeling

Submitted by drodney on Wed, 04/30/2014 - 21:37

In the context of a European project involving partners in France, Germany and Belgium, we are seeking a motivated post-doc to implement a saddle-point search method in a discrete dislocation dynamics code to study thermally-activated dislocation processes, such as cross-slip, in complex microstructures. The start date is October 2014 and the post-doc will be based in Lyon (Institut Lumière Matière) but with strong interactions with the Laboratoire d'Etude des Microstructures, CNRS/ONERA near Paris.

Multiscale Material Modelling

Submitted by Mirkhalaf on Wed, 04/30/2014 - 13:34

research

Computational modelling of materials behaviour
is becoming a reliable tool to underpin scientific investigations and to
complement traditional theoretical and experimental approaches. In cases where
an understanding of the dual nature of the structure of matter (continuous when
viewed at large length scales and discrete when viewed at smaller length scales) and
its interdependences are crucial, multiscale materials modelling (MMM)

Yield surface of a material model

Submitted by Mirkhalaf on Wed, 04/30/2014 - 12:15

research

viscoplasticity

UMAT Subroutine for creep in concrete beam

Submitted by ghabdian on Wed, 04/30/2014 - 10:47

Hi.

I want to model creep of concrete beam in ABAQUS. I will be appreciated if anybody send me a sample of UMAT subroutine.

Thanks a lot.

Mohsen

Fracture toughness of graphene

Submitted by Jun Lou on Wed, 04/30/2014 - 04:57

research

Fracture Toughness of Graphene

P. Zhang, L. Ma, F. Fan, C. Peng, P.E. Loya, Z. Liu, Y. Gong, J. Zhang, X. Zhang, P.M. Ajayan, T. Zhu, and J. Lou
Nature Communications, Vol. 5, article number 3782, 2014. DOI: 10.1038/ncomms4782

http://www.nature.com/ncomms/2014/140429/ncomms4782/full/ncomms4782.html

why the mass matrix of my structure is unsymmetric?

Submitted by Yanhai on Tue, 04/29/2014 - 17:32

research

I'm doing an research about a cantilever which can undergoes large rotations along two directions. At the head of the cantilever there is a magnetic particle. When I establish the dynamic model for this cantilever, I just consider the mass of the particle(since the mass of the beam is small). However after I obtian the mass matrix (6 by 6, six DOFs), i found it is not symmetric. I don't know the reason. Can anyone help me? By the way, if the beam undergoes large rotation, will the stiffness matrix(tangent matrix) at each state keep symmetric ? Thank you