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PhD (4 years) on finite element modelling of textile materials and processes

We are looking for a PhD student for a research project on textile modelling. In this project, the main purpose is to develop a multi-scale textile modelling framework that allows accurate simulation of textile manufacturing processes such as yarn unwinding from a bobbin, weft insertion during weaving, stitching and tufting. This framework is implemented using finite element modelling as well as virtual fibre modelling. Key here are the dynamics of these systems as most textile production happens at high speeds.

ABAQUS - Viscous Pressure - Beam elements

Hi!

I am trying to apply a viscous pressure (VP) load to beam elements (B31) but I obtained thie error message: "INVALID LOAD TYPE ON ELEMENT * INSTANCE *. LOAD TYPE VP IS NOT VALID FOR ELEMENT TYPE B31"

Do you have any suggestion?

Thank you!

surot's picture

VUMAT viscoelasticity (Maxwell model)

Dear all,

I would like to ask you for advice. I am about to simulate a pull-through test (see attached picture) of a cladding panel made of a material with highly viscoelastic behaviour. I have parameters for Maxwell model (Prony series) obtained from test. I expect large deformation and probably cone failure (or tearing of the cladding panel). Therefore I would like to use Abaqus/Explicit. The problem is that I cannot use *visco step together with Explicit. Is there any way to solve it?

CP model

I am new to crystal plasticity simulations and have been studying the concepts from "Introduction to Crystal Plasticity" in Mechanics of Microstructured Materials book.

Input file for the CPFE VUMAT in Nonlinear finite elements for continua and structure

I am learning crystal plasticity and its implementation as VUMAT subroutine from the book Nonlinear finite elements for continua and structure. I am aiming to gain more insight about the implementation by studying the poly-slip, rate-dependent, single crystal plasticity subroutine provided in the solution manual.

However, I couldn't reproduce the example in the book successfully, as I believe I have made errors in defining the material properties in the Abaqus input file. So, can someone please provide the input file for the associated VUMAT subroutine?

PhD/postdoc vacancy (4 years) on development of topology optimization algorithms for functionally graded materials

Wire Arc Additive Manufacturing or WAAM techniques are attracting interest from the manufacturing industry because of their potential to produce large metal components with low cost and short production lead time. This process exists alongside other high deposition rate metal AM technologies such as powder and wire based DED. While these use either laser or an electron beam as energy source to melt a metal powder or wire, WAAM technologies melt metal wire using an electric arc.

Abaqus Explicit: difference in TEMP, STRESS and PEEQ computation between adiabatic and coupled

Hi,

I have the two following INP files for Abaqus where the only difference is that in one case I'm using a CAX4R element on the other case, I'm using a CAX4RT element. Solver has been changed from one case to the other one.
This is the only difference between both cases.

Simulation time is small, so that conduction is negligible.

BUT: results in terms of Strains, Stresses and Temperatures differs.
T = 164.1°C for CX4R
T = 323.9°C for CAX4RT

The difference is Huge, what's Wrong ?

Olivier

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, 

Patnaik'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

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