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Problem with defining corner BC/constraint

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

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Hi all,

Simulate adhesion between two colliding parts in Abaqus

Dear all,

 I have two parts in my model, one part impacts on an another fixed part. I was wondering if is it possible to specify a criterion during this collision simulation that would enable adhesion between those parts when the stress or strain in either of the parts reaches a critical value? If so, can anyone suggest some suitable reference or a methodology to achieve this? I know, I can use cohesive surfaces to simulate bonding. But, I want to use a criterion pertaining to entire parts and not just surfaces. Any suggestions or help would be most welcomed.

Leon Mishnaevsky's picture

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

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

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

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?

 

 

how to run a python script after each increment in abaqus.

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hi,

I am doing static stress analysis. in my problem, I have to update my input file after each increment. so for updating the input file, I have to do some calculation depend on the output of the previous increment result. for these calculations, I have to call the odb file after each increment, do some calculations, update the input file and the process will go on. I have written a python script for the calculations from the odb file but don't know how to use this script after each increment.

 

thank you

Mohammed Bouchelarm's picture

Strain values transformed in a rotated x'y'-Cartesian coordinate system with ABAQUS

Dear All,

I'm trying to get strains in some specific points (along a path) from the xy-Cartesian coordinate system to a local x'y'-Cartesian coordinate system rotated through an angle (theta) which means transform the strains (Ex,Ey) to (Ex',Ey') as described in the attached figure, something I usually do manually with Mohr's circle and I wonder if I can do it directly with Abaqus ?

Thank you in advance !

Regards.

Mohammed.

 

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