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Global buckling in a 3D beam ABAQUS

Submitted by miguelcosta on
buckling

Hello everyone, 



I want to reproduce global buckling of a 3D column (simply supported) using shell elements independently of its length. 

I know that each section of the column should behave like a rigid body but I can't do it, so by doing the buckling analysis I get other buckling modes (like local buckling). 

My initial idea was to use rigid body (tie) constraint in some sections (uniformly spaced) but what I got was some local buckling in the extremities of the column. 



New view of DNA

Submitted by bin.chen on
research

Recently, the classical view of DNA as an isotropic elastic rod has been questioned. Here we model DNA as an elastic rod inlaid with fibrils, based on which we have made prediction that is in consistency with experiments. Our analysis suggests that the bending of short DNAs can be facilitated if there exists a specific structural heterogeneity.

http://appliedmechanics.asmedigitalcollection.asme.org/article.aspx?articleid=1841526

Ice failure simulation

Submitted by santhosh_ajayy on
education
ABAQUS

Hi,

  I want to simulate Ice failure simulation in abaqus. In my problem, ice is deposited between 2 components.

  While I am trying to move one compoents, the ice is restricting the movement of the components. Now I want to find out the force at which the ice starts to failure .

  any methods are available n abaqus., Plz let me know if any body knows abt this kind of simulation.

 

Thanks in advance

Ajayy.S 

Is anyone familiar with deriving shape functions for different beam end conditions?

Submitted by santhosh_ajayy on
research
finite element methods
mechanical vibration
nonlinear finite element methods

I am doing my research in nonlinear vibration of beams. In that research, I have to derive the shape function for different end conditions of the beam. Regarding this,I need some ideas. Are there books I can reference?

Thank you for your help.

Nastran SuperElement

Submitted by urkabil on
research
DMIG

I would like to use condensation to calculate the normal modes of
a structure. These grids are connected to the structure through RBE3 (master
grid). Let me know if there's a way to use the master grids of RBE3 elements in
the A-SET?

the error form the f06  

*** USER FATAL MESSAGE 2101 (GP4)

GRID
POINT    1000005 COMPONENT  1 ILLEGALLY DEFINED IN SETS  
UM   UC 

PhD positions in Mechanical Engineering at Politecnico di Milano

Submitted by Silvia Barattieri on
job
phd
job
mechanical engineering
scholarship
phd openings
italy
milan
grants

PhD positions in Mechanical Engineering at Politecnico di Milano

The Department of Mechanical Engineering of Politecnico di Milano is currently seeking applicants for PhD studentships.

For more information about proposed research topics and scholarship availability please see http://www.mecc.polimi.it/en/phd/phd-positions/

 

PhD positions are available in our seven research areas:

Abaqus: Composite delamination with cohesive elements

Submitted by Maria Pia on
ABAQUS
FEM
composite delamination
 
Hello,
I have to do a FEA regarding impact damage and delamination propagation in a CFRP specimen.
I have to do this using cohesive element in order to see the propagation of the delamination front in the material.
My problem is that I don't know how to do this in Abaqus.
I'll better explain: I can use this software but is the first time approching composite behavior and I really don't know how to model that.
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