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#ABAQUS

Why getting trouble with Abaqus UMAT subroutine when using interaction features like contact or tie?

Submitted by Rudraprasad Bh… on
software
#ABAQUS

I am implementing a constitutive relation in UMAT subroutine using the commercial software Abaqus. First, I tested the UMAT subroutine with 'one element model' first. Then I tested with comparatively bigger geometry. It worked fine. Now when I am trying to do a models involving contact, i.e. use of the 'Interaction module'. I am getting error of over-constraint warning for 'Split Tension test of concrete cylinder'. The same input file (except the material definition) is running on Abaqus perfectly with Mohr-Coulomb criteria. I can see a reasonable stress and strain contour.

PhD position: multiscale computational mechanics of advanced composites

Submitted by claudiosaul.lopes on
job
composite materials
multiscale modelling
# Finite Element modeling
#ABAQUS

The Composites Materials Group (http://www.materials.imdea.org/groups/cm/) at IMDEA Materials, led by Dr. Carlos González and Dr. Cláudio S. Lopes, invites applications for a PhD student position in the field of multiscale computational mechanics of advanced composites. Candidates with interest and knowledge on computational damage mechanics, model development, numerical simulation and optimization methods for advanced composite materials and structures are strongly encouraged to apply.

Problem with defining corner BC/constraint

Submitted by frobles on
Forums
Computational Mechanics Forum
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#ABAQUS
constraints
BCs

Hello all,

I'm trying to model the buckling of a shell structure under thermal load.

The structure is square-shaped.

The left edge must be kept straight. To achieve that, I applied MPC Tie Constraint for its nodes.

The bottom edge must be fixed so that the BC applied at its nodes was U1 = U2 = U3 = 0.

Temperature is applied as a predefined field.

However, when I run the simulation the corner that connects both edges deforms very strangely which makes me question how to model it.

I appreciate any input. Thanks.

About periodic BC for large mesh in ABAQUS

Submitted by Bowen Liang on
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ABAQUS periodic
parallel

Hi all,

I'm using ABAQUS-2016 to run a parallel simulation, and I met a problem for assigning periodic BC in large mesh size. I want to make four nodes to be periodic with each other. Normally, I give the node pair in the equation option as:
*Equation
2
nset_1, 2, 1.
nset_2, 2, -1.
*Equation
2
nset_1, 2, 1.
nset_3, 2, -1.
*Equation
2
nset_2, 2, 1.
nset_4, 2, -1.

Abaqus/Python - commands to find nearest node to a given point

Submitted by Leon Mishnaevsky on
software
#ABAQUS

Hi,
I need to write a python comman code to find a node (in a given set), nearest to a given point.
The code now looks as follows:
import sys
sys.path.insert(10, 
r'c:/SIMULIA/Abaqus/6.13-3/code/python/lib/abaqus_plugins/findNearestNode')
import nearestNodeModule
nearestNodeModule.hideTextAndArrow()
a = mdb.models['FibreModel'].rootAssembly
n1 = a.instances['Fibre0-1'].nodes
pickedSelectedNodes = n1[0:599]
g=nearestNodeModule.findNearestNode(xcoord=101, ycoord=106, zcoord=58, name='', selectedNodes=pickedSelectedNodes, instanceName="'Fibre2-1'")

How to find normals stresses in the global x y z direction in ABAQUS?

Submitted by Anonymous (not verified) on
Abaqus 6.11-3
#ABAQUS
Abaqus 2016

I am trying to find normal stresses (in the global x-y-z direction) of individual layups (plies) in ABAQUS. While post processing I only find S11 S22 S12. Do I always have to use a transformation matrix to find my Sxx Syy and Sxy? Is there a GUI/ Command way to extract the stresses in each ply in xyz directions?

 

 

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