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How to get all nodes from an edge?

 

Hi all,

I'm new at Abaqus scripting and I need to find all nodes along the upper edge (I'm using a 2D rectangle) and put each one in a node set.

I tried to use the labels, but they have a strange order and I need to pick them from the first node of the right side until the last one. It works, but I don't know to sort them and I think it would be better to pick it using the coordenates, but I don't know how to do this in my case.


Here is a pie of my code where I acess the nodes using the labels

#acess the nodes

a = mdb.models[model_name].parts['part_name'].nodes


#first node label from the right side of the upper edge

nodeLabel1 = [36]

#second node label from the right side of the upper edge

nodeLabel2 = [325]


nodes1 = a.sequenceFromLabels(nodeLabel1)
nodes2 = a.sequenceFromLabels(nodeLabel2)


#create the sets to each single node

mdb.models[model_name].parts['part_name'].Set(nodes=nodes1, name='set1')
mdb.models[model_name].parts['part_name'].Set(nodes=nodes2, name='set2')


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Hyperelastic Material

 

Hi everybody,
I want to simulate a Hyper-elastic material (named PTFE) to obtain contact pressure via simulation.
I used Mooney_Rivlin as material model.Does anyone have suitable coefficient material properties for Mooney-Rivlin  material model for this kind of material? And is it necessary to define any property except Monney-Rivlin coefficient for this type of material model (for example Elasticity modulus and poisson ratio)?
Thanks
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Posted by: Soroush Heydarian <soroush.heydarian <at> yahoo.com>
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Extract boundary conditions from odb file

 

Dear All:

I want to extract boundary conditions from odb file using python scripting. But, I couldn't find a python (relates to Abaqus objects) command to do that. One way is to search through nodal displacements, then select those nodal DOFs with zero values. But, I think this method is not efficient.

Can anyone help me with this issue??

Regards,
Malekan
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Posted by: Mohammad Malekan <malekan2005 <at> yahoo.com>
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Tie_surface modeling with UEL user subroutine

 

Dear All,

To save computation cost I need to insert a tie surface between two parts to make one of them with coarse mesh and other with fine mesh using UEL subroutine, may you help please?


Best regards,

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Posted by: Almo M <almo_1 <at> outlook.com>
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Assigning material properties

 

Can a single part have multiple material properties assigned to it? For example, a laminate part composed of an isotropic layer and a cfrp layer modeled as a single part with an element set for isotropic material and for cfrp layers. Or do I need to create the parts separately, assign material properties separately, then assemble?

Thanks.

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Posted by: Imran Hyder <imranhyder8 <at> gmail.com>
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Increasing number of section points in rectangular section

 

Hello everyone, I have a question regarding the section points in rectangular cross section. By default there are 5 points in the rectangular section for a beam in a plane. In Abaqus Analysis User's Guide (Abaqus 6.13) in section 29.3.9 "Beam cross section library" under "Rectangular section" is written: "Nondefault integration input for a beam section integrated during the analysis -> Beam in a plane: Give the number of points in the second beam section axis direction. This number must be odd and greater than or equal to five." So my question is, how can I change this number? I need to increase this number in order to get stress input from these points over rectangular cross section and the beam section has to be integrated during the analysis not precomputed. Thank you for your answer Lucie

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Posted by: Lucie Du <s131609 <at> student.dtu.dk>
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How to make continuous nonlinear step after RIKS step?

 

Dear everyone, I am an Abaqus beginner. I want to make two continuous nonlinear steps in Abaqus. The step-1 is a nonlinear Riks simulation. And the step-2 is also a nonlinear heat transfer simulation. Put when I submitted, I got Errors like below. ***ERROR: IF A RIKS STEP IS SPECIFIED IT MUST BE THE LAST STEP IN A DATA DECK. ADDITIONAL STEPS MAY BE DEFINED VIA THE *RESTART OPTION. I do not want to change the step order. Should I use *restart function? What should I do to solve this error? Thank you so much. Sun

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Posted by: sun <sun_han_cool <at> hotmail.com>
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Problem in extracting stiffness matrix using input file method

 

Dear All:

I have a problem when I want to extract stiffness matrix using input file. When my input file has node and element specifications and coordinates inside it, I can extract stiffness matrix using these command line:

STEP, name=exportmatrix
MATRIX GENERATE, STIFFNESS
MATRIX OUTPUT, STIFFNESS, FORMAT=LABELS
END STEP

But, when I call nodes and elements specifications and coordinates from other files into the input file, I couldn't able extract stiffness matrix using above commands. Does anybody know why?

Regards, 
Malekan
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Posted by: Mohammad Malekan <malekan2005 <at> yahoo.com>
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rigid body surfaces

 

hi all,

i am faily new to abaqus and require some help. I merged two discreet rigid body parts (part1= wavy suraface and part2=a block) in the assembly mode to make block with wavy surface(i.e my part 3). Now we i try to defined surface to surface interaction with a deformable part, i get an error saying cannot do for non homogeneous surface.

I defined my parts to be all homogeneous. where am i going wrong?



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Posted by: jineshdahal <at> yahoo.com
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abhiajri@gmail.com [Abaqus] | 22 Jan 17:00 2015
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Friction Stir welding

 

Hello everyone,


I am presently working on the simulation of the friction stir welding process. Has anyone in this group worked on severe plastic deformation or the simulation of the friction stir welding process itself?


Thanks for your help and time,


Sincerely,

Abhishek Ajri 

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Re: Output units for rotation?

 

Hi All,

A quick question about the output units. I'm trying to compare the rotation between my model and the test results and they are completly different. i'm starting to think i'm using the wrong units. Can anyone tell me the units of rotation obtained from Abaqus? is it degrees or radians ?

Thank you all.

--
Best Regards,
Diana Abdulhamid
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Posted by: Diana Abdulhameed <dabdulha <at> ualberta.ca>
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Gmane