Blog posts

PhD position at the University of Glasgow

Submitted by grassl on Wed, 03/07/2012 - 16:55

PhD position at the University of Glasgow on “Modelling of geo-engineered barriers for underground nuclear waste storage”

This project will take place at the School of Engineering of the
University of Glasgow in the UK and will be jointly supervised by Dr
Domenico Gallipoli and Dr Peter Grassl. The project will develop the
simulation tools for predicting the long-term behaviour of
geo-engineered barriers used in the geological (underground) storage of
nuclear waste. A typical geological storage scheme for nuclear waste

UMAT : Gurson-Tvergaard-Needleman model

Submitted by Seagull on Wed, 03/07/2012 - 16:48

I try to program the GTN model in a UMAT with isotropic hardening and anisotropic Hill yield criterion. I just want to know if someone has an example of UMAT dealing with the original GTN model (Von Mises criterion). This example would help me a lot in order to compare my code and perhaps to find my mistakes.

ABAQUS: I can't find the ErrElemMissingSection as defined in the error message of the aborted job.

Submitted by MD FARSID HAQUE on Wed, 03/07/2012 - 08:04

software

ABAQUS/CAE

missing property definitions

ErrElemMissingSection

Hi Guys,

I am facing the following error in the execution of a job in ABAQUS:

'Error in job ModalTest_2: 27 elements have missing property definitions. The elements have been identified in element set ErrElemMissingSection.

Error in job ModalTest_2: SECTION DEFINITIONS ARE MISSING OR INCORRECT FOR THE ELEMENTS INDICATED ABOVE. FURTHER PROCESSING OF THE INPUT FILE IS NOT POSSIBLE UNTIL THIS INPUT ERROR IS FIXED.'

How to get data in an rigid surface in Abaqus

Submitted by yty3522269 on Wed, 03/07/2012 - 02:04

research

Recently,I made a model of two parts

1. a circle pad (deformed)

2.a discrete rigid line (move upwords)

the problem is I want to get the reaction force in the rigid surface,but I can not.

I must get it from the pad because I must make the rigid part more well meshed,I want to get better data.

Could you tell me how to get data in rigid part when contact occur?

Thanks a lot.

Multiscale simulation

Submitted by ssoon on Wed, 03/07/2012 - 01:23

opinion

multiscale simulation

Nowadays, we are talking about multiscale simulation. I am surprising that we discussed about multiscale modeling while units are still exist. In my point of view, the multiscale only be achieved if units in general equations were treated.

Explicit Integral

Submitted by hrbeu221 on Tue, 03/06/2012 - 20:51

When use matlab or mathematica integrate this y = int(cos(m*pi*x/a)*cos(n*pi*x/a)/(x+a0)^2,x,0,a); (m,n=0,1,2,3,4,5...)

There is some explicit integral. I try to solve this problem. But the result is complex.

Is there some effective way to solve this problem.

Thanks!

Journal Club Theme of March 2012: Brownian motion and entropic elasticity of fluctuating filaments and networks

Submitted by pk_purohit on Tue, 03/06/2012 - 15:39

research

The advance of mechanics towards the frontiers of biology and soft matter necessitates an understanding of entropic forces which manifest themselves as thermal fluctuations at length scales of a micron and below. The effects of these fluctuations can be easily seen in biofilaments at thermodynamic equilibrium under the action of forces and moments as they fluctuate around their minimum energy configuration due to Brownian motion. This remains true of filaments in networks and gels such as those of actin, spectrin, fibrin or other biopolymers.