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CMiculas's picture

How to import edited node coordinates (mesh) to Abaqus?

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import modified nodes coordinates to abaqus

ebarbero's picture

How do I count Keyword Blocks in the Abaqus input file?

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The Abaqus documentation, available here:

https://abaqus-docs.mit.edu/2017/English/SIMACAEMODRefMap/simamod-c-inpu...

states the following:

Certain keywords must be used in conjunction with other keywords; forexample, the *ELASTIC and *DENSITY keywords must be used in conjunction with the *MATERIAL keyword. These related keywords must be grouped in a block in the input file; unrelated keywords cannot be specified within this block. 

ebarbero's picture

Abaqus nodes are missing degree of freedoms. ErrNodeMissingDofConstrDef

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Problem Description/Question: 

I model a cantilever beam with 2D plane stress elements. 

The left end of the beam is clampled (encastre).

In Step 1, I use a coupling constraint U2=coupled to apply a vertical load on the right (loaded) end of the model.

In Step 2, I use a different coupling constraint U1=coupled to apply a traction load on the loaded end of the model.

Each constrain is defined with different reference point, different surface, totally independent of each other. 

jstello's picture

Ackward behavior in Abaqus

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Hello colleagues! 

 

I am facing a very strange phenomenon in Abaqus 2019. Setting up a transient consolidation analysis, and despite converging and showing job as complete, no output is written to the job at all. Needless to say, I am requesting standard field output every n=1 steps and the analysis is 10 increments or so. It's quite frustrating to see your mesh disappear when you expect to see nice colors. If this ever happened to you please do share how you went about it. 

 

Cheers, 

sp435's picture

High strain rate liver tissue compression

Check out our latest publication on porcine liver biomechanics under high strain rate conditions -

"Mechanical Response of Porcine Liver Tissue under High Strain Rate Compression", Bioengineering, 2019, 6(2), 49; https://doi.org/10.3390/bioengineering6020049

https://www.mdpi.com/2306-5354/6/2/49

rajan_prithivi's picture

How to automate surface creation in Abaqus ?

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I would like to create a surface (on top side of a cube) in Abaqus

I am aware of doing it manually by using the following in GUI :

 

1) Tools->Surface-> Create

2) Select regions for surface by the angle

 

This is what I tried and failed :

ebarbero's picture

how to access the main page of abaqus-docs.mit.edu

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I found a great tutorial for abaqus/cae at https://abaqus-docs.mit.edu/2017/English/SIMACAEGSARefMap/simagsa-m-Caeb... but I cannot find the main page, which I need to navigate it; I am forced to Google for individual sections guessing at what the section titles migh be; I need a URL to the root page so I can navigate the tutorial like an ebook. 

 

ebarbero's picture

Abaqus startup start-up initialization file Python script

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I  need to find a startup file that Abaqus/CAE reads on startup to add a line of Python to modify the behavior the way I like it. I find myself adding this line manually every time I start Abaqus/CAE and I am tired of it. Like the .gpr file but .grp is a binary file--I cannot add things to it with a text editor. It has to be an initialization file, right? Or may be some other way to do it. Thanks in advance. 

 

ebarbero's picture

Abaqus startup start-up initialization file Python script

I need to find a startup file that Abaqus/CAE reads on startup to add a line of Python to modify the behavior the way I like it. I find myself adding this line manually every time I start Abaqus/CAE and I am tired of it. Like the .gpr file but .grp is a binary file--I cannot add things to it with a text editor. It has to be an initialization file, right? Or may be some other way to do it. Thanks in advance. 

ebarbero's picture

how to access the main page of abaqus-docs.mit.edu

I found a great tutorial for abaqus/cae at https://abaqus-docs.mit.edu/2017/English/SIMACAEGSARefMap/simagsa-m-Caeb... but I cannot find the main page, which I need to navigate it; I am forced to Google for individual sections guessing at what the section titles migh be; I need a URL to the root page so I can navigate the tutorial like an ebook. 

Question about implicit creep subroutine in Abaqus

The implicit implementation of creep in abaqus requires dh/d(\delta \epsilon_c ) as Jacobian in Newton-Raphson's iteration. The derivative can be expanded as shown in the figure attached. The term dh/dq, the one underlined by a green stroke, is expected to be provided by users through specifying DECRA, whereas the term dq/d(\delta \epsilon), underlined by a red one, is confusing me. It seems that that term is computed by Abaqus but I have no idea how it is done. The same question applies to the last derivative on the right hand side.

Cohesive element modelling problem in ABAQUS

Dear All,

I am modelling a 3 point bend specimen with Cohesive elements tied to the upper and lower halves of the specimen in 2d.

The problem is that the CZ elements perform properly only for a combination of element sizes, i.e. a combination of element size of structure and CZ elements, for instance in my case the structure/specimen element size is 0.2mm and CZ is 0.001 or 0.002. For any other combination the adjacent elements bend as shown in the attached image.

I will be glad if someone could explain this behaviour and the solution.

Research Position Computational Fracture Mechanics

A research position is available at the Erich Schmid Institute of Materials Science of the Austrian Academy of Sciences in order to conduct a strategic project funded by the COMET-K2 Competence Center on Integrated Research in Materials, Processing and Product Engineering in Leoben.

What fatigue damage model do you suggest to use in numerical simulations?

I want to simulate fatigue damage of foams (like PVCs). What fatigue damage model do you suggest? What model is regularly used in Industry? is there any one who simulate fatigue damage in Abaqus? Any information is welcomed...  Thanks in advance

What fatigue damage model do you suggest to use in numerical simulations?

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I want to simulate fatigue damage of foams (like PVCs). What fatigue damage model do you suggest? What model is regularly used in Industry? is there anyone who simulate fatigue damage in Abaqus?Any information is welcomed... Thanks in advance

subroutine interface to visit nodal displacements in Abaqus

I wonder if there is any subroutine interface to have access to nodal ( not integral point ) displacement in abaqus DURING the analysis phase.  Suppose I have a field that is going to be used in UMAT and that is dependent on  displacements of all nodes (presumably stored in an array) from the last increment. Is this possible to be implemented within Abaqus?

Thank you all !

FEA Position at BD Working on the Next Generation of Medical Devices

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BD is one of the largest global medical technology companies in the world and is advancing the world of health by improving medical discovery, diagnostics, and the delivery of care. The BD Corporate CAE group, located near Raleigh, NC, is hiring an Engineer II focused on nonlinear structural mechanics, primarily using Abaqus.

dithoap's picture

2 POSTDOC posts on Computational Solid Mechanics (Delamination modeling) and Functional Nanocomposites/Wearable Electronics

The Division of Physical Sciences and Engineering at King Abdullah University of Science and
Technology (KAUST), Saudi Arabia, invites applications for Postdoctoral fellow in Mechanical
Engineering at the Composite and Heterogeneous Material Analysis and Simulation Laboratory
(COHMAS, http://cohmas.kaust.edu.sa).

2 field of studies are available:

User defined contact output (at contact pairs)

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Hi all,

ABAQUS - the influence of changing kinematic and cycling hardening parameters

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Hello,

 

I have recently done a simple hourglass model to check the influence of hardening parameters in Abaqus. The reason was the effects of the parameters' change in bigger models were a bit surprising, therefore I needed to investigate the reason using some simpler model. Please see file 1.

 

After performing tension/compression cycles I got results as shown in files 2, 3, 4 and 5. Please note that only the hardening parameter in the description changes, the other three stays the same for each series.

 

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.

Lumped heat capacitance matrix and temperature oscillation.

Hi,

 

When I was reading the Abaqus manual about transient analysis in thermal field, I found a sentence that says 'In transient analyses using first-order elements the heat capacity terms are lumped, which eliminates such oscillations....' (Transient analysis in Abaqus Analysis User's Guide 6.5.3). 

I think that this 'oscillations' is related to not only explicit time integration, but also implicit time integration (such as Backward Euler method).

Piezoelectric Stack Modelling in ABAQUS

How does one model a piezoelectric stack Actuator in ABAQUS?

Abaqus User defined Routines

I have been using an Abaqus dll created using a user-defined routine. Things work well on a serial case. The issue comes when I try to use it in parallel. I am trying to do this on windows 7. The error I get is

forrtl: severe (59): list-directed I/O syntax error, unit 12,

in Fortran I/O but I do not get this error when I run the simulation serially. Any ideas will be helpful.

Thanks

 

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