Blog posts

Fatigue crack propagation

Submitted by nggovind on Thu, 04/16/2009 - 07:17

I try to do fatigue crack simulation in general FE code (ANSYS) for 3D formulations. I face very hard to get mesh with crack tip elements (for 2D it s quite easy to use KCON options). Any idea how to perform for the 3D crack tip mesh.

regards

Govind.

Probelm with Abaqus/Explicit

Submitted by Gouse on Thu, 04/16/2009 - 06:38

research

ABAQUS

cohesive zone model

Hi,

I am using cohesive elements to model the interface around a
circular inclusion. First I used Abaqus/standard I got proper results
but when I used same values with an amplitude curve (tabular, linearly
applied) to apply load quasi-statically in Abaqus/Explicit, I could not get a converged
solution. Field variables are oscillating and elements getting
distorted excessively. In Abaqus/Explicit I am applying load very
slowly but even though same problem persists.

Regards

Gouse

LS DYNA User Defined Failure Criterion

Submitted by Kapil.Nandwana on Thu, 04/16/2009 - 01:07

LS DYNA

USER DEFINED

FAILURE CRITERION

Hi:

I am simulating a projectile impact on a plate and using LS - DYNA for the same.

I have to use Barlat's anistropic plasticity model with the Johnson Cook Failure Criterion.

Now, Although Barlat's Model is in built into LS DYNA, how do I implement JC Failure criterion ? Is there a feature of User defined failure criterion in DYNA ?

If not, Is implementing a UMAT consisting of Barlat's consitutive eqn and JC failure criterion the only other option ?

Thank You,

Openings Available: Ph.D. students in MEMS/Nanotechnology

Submitted by tonyjunhuang on Wed, 04/15/2009 - 19:02

job

The Penn State Biofunctionalized Nano-Electro-Mechanical-Systems (BioNEMS) Laboratory (http://www.esm.psu.edu/huang/) is actively recruiting highly motivated, qualified Ph.D. students.

We welcome students trained in the following fields: Mechanical Engineering; Electrical Engineering; Chemical Engineering; Chemistry; Biology; Optics; Material Science; Bioengineering; Physics.

Outstanding Scientists : New Delhi (India)_ CSIR

Submitted by Amit Pandey on Wed, 04/15/2009 - 16:51

job

India

outstanding scientists

Oppurtunity for experience scientist and professors at

Council of Scientific & Industrial Research [CSIR]:

http://www.csir.res.in/

http://www.nature.com/naturejobs/science/jobs/93864-Outstanding-Scienti…

You have a mission back home in India

Symmetry of Infinitesimal (linear) strain tensor

Submitted by Jayadeep U. B. on Wed, 04/15/2009 - 10:51

education

strain tensor

Hello everyone,

Why do we have the infinitesimal (linear) strain tensor to be symmetric? The reasons, which I have understood so far are:

1. It is defined to be symmetric so that it behaves like a tensor.

2. The stress tensor, which is its energy conjugate, is symmetric, and hence the skew-symmetric part has no contribution towards strain energy.

Can anyone suggest more fundamental reason(s) for the symmetry of linear strain tensor, like the moment equlibrium leading to symmetry of the Cauchy stress tensor?

Thanks in advance,

Issue of "COMMENTS FIELD IS REQUIRED"

Submitted by GOPALAERO2000 on Wed, 04/15/2009 - 05:44

post reply

Hi everyone,

Sometimes while replying for the answered queries, I face the issue of "COMMENTS FIELD IS REQUIRED" inspite comments field is filled. I have attached the same in the presentation. Please go through it help in this regard.

Thanks and Regards

M Gopalakrishnan