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ABAQUS Element Connectivity

Hi, 

I am trying to mesh the hollow sphere attachged using structured BRICK-8 elements. It turns out in order to have a structured mesh, I have to have 2 partitions such that four quadrants be generated.

What I only need from ABAQUS is the element connectivity. I do not need to solve any problem.

Export Mass Matrices in Abaqus

Hello,

 

I have to export stiffness and mass matrices from Abaqus (dynamical simulation)

and I have been using the commands *Matrix Generate and *Matrix Output

 

I need to export the matrices for different  instants of time  (time intervals) and I have noticed that the entries

of the MASS matrices are not equal at different  time points.

 

Is that correct or should the MASS matrices be constant for a dynamical simulation?

 

many thanks

ABAQUS ALE gives random solution

Hi all,

 

I am simulating an excavation problem using the ALE method. If I rerun exactly the same input file only changing the duration of the last (long) step and compare results of the two analyses at the same analysis time I get significantly different results (e.g. up to 20% different settlements). I have tried changing the last step duration and I get different results again. How can this be? I am really worried about this behaviour!

 

Regards

Question about the tangential behavior of ABAQUS

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Hello everyone, I am using ABAQUS to study the tangential behavior (friction) at the interface between rock-machine. I know tangential behaivour simualtion is key for my model, I read the manual, but still have some puzzels, hoping you could help me, much appreciated in advance!

 

VUMAT general queries

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Hi,

I am beginner in abaqus and I want to write a VUMAT for VIB method to simulate fracture, while writing VUMAT i encountered following problems 

1) For 2D plane stress problem how to calculate strainInc(*,3). It is increment for that step or value of strain till that step?

2) What is effect of that defination on answer I am getting?

Load Displacement curve for XFEM in ABAQUS

I am using Maxps Damage criteria for an XFEM crack for a three point bending case. I am using displacement loading on the specimen and wish to plot reaction load v/s mouth opening displacement. I would like to know how to obtain the crack tip opening displacement in ABAQUS. All the journal papers I read show a slump in reaction force after the crack starts to propagate. I plot the results and contour plots show me clearly that the crack has started to propagate. Please help.

BOLT ANALYSIS USING ABAQUS

Dear friends,

Recently my study is focus on bolt analysis on wheel hub assembly.

In simulation using Abaqus, I try to give a certain value of tightening torque on bolt to determine the clamp force.

But, I do not know how to apply the torque value on FE model.

Can we convert torque to became as an axial force?

Or, convert torque to moment?

software comparison (abaqus, ansys, flac, udec)

hi everyone, right now I am writing my reserach proposal and met some question really need your help. thank you in advance!

Abaqus

is there any command available to skip/suppress the element quality check, while running an analysis in abaqus?


 

H.Rahnama's picture

A UMAT Code In ABAQUS - Progressive Failure Analysis

I have written a UMAT code in ABAQUS. This UMAT degrades the young modulus of an isotropic elastic material at a point when the VonMises stress at that point reaches a specific value. It can be seen as a simple progressive failure code. I have applied this UMAT code to a Notched plate under uniform tension.

The problem is that exactly before the damage initiation, the ABAQUS/Standard diverges. I am sure that there is a very simple mistake that I just can't see!
:)

Lance C. Hibbeler's picture

ABAQUS: nice colorbar ranges

I have produced a python script that automates setting up reasonable values in the ABAQUS/CAE colorbar, basically setting up Tecplot functionality.  After executing the script from File->Run Script, you have access to a function that you can call in the built-in interpreter,

>>> SetContourRange(minval, maxval)

Gatherin results from multiple points in the parametric study

Hi everybody! 

I am doing a large parametric study of a composite shaft. I am working with 5 variables and the number of simulations and data will be quite big. 

I would like to gather results automatically on a circumferential path around the shaft. (About 60 elements) 
Is it possible to do it with a "gather" command - I think that only one node/integration point can be defined at "gather" command. 

Has anyone already done something like that and how did you solve the problem. 

Soud Choudhury's picture

Abaqus is not reporting any CEEQ in coupled temp-displacement step

Hi all,

I am modeling a simple coupled temp-displecment analysis with the following step information:

** MATERIALS

** 

*Material, name=Material-1

*Conductivity

 1e-06,

*Creep, law=HYPERB

44000., 0.005,   4.2, 45000., 8.314

*Elastic

60000., 0.34

*Expansion, zero=25.

 1.4e-05,

*Plastic

20.,  0.

60., 0.1

** 

** PHYSICAL CONSTANTS

** 

*Physical Constants, absolute zero=-273., universal gas=8.314

** STEP: Step-1

** 

How to use abaqus input files from abaqus example problems guide

I am new to abaqus and am going through this tutorial on "Damage and failure of a laminated composite plate".  I find lot of input files at the bottom of this example. I tried "importing" them by going to file->import but I find that there is no geometry or mesh associated with it. Does one create the geometry oneself? How do we use the sample ".inp" and ".f" files to learn about abaqus sample problems.

wvmars's picture

Engineering Analyst position with focus on FEA, elastomers, and fatigue life prediction

Endurica, LLC is a growing software and consulting services company headquartered in Findlay, Ohio, USA. The
company develops and sells solutions that enable customers to manage durability of elastomeric products. Our
physics-based solutions include computer-aided engineering software that numerically simulates the fatigue life
of elastomeric products, a materials characterization service, and project-oriented consulting services. Our
software is distributed globally in partnership with Dassault Systemes.

Imperfection in a Riks Analysis (ABAQUS)

I am performing a nonlinear post buckling using Riks method. I went through different tutorials for the same. I happen to see that an *IMPERFECTION is introduced while performing the non linear buckling analysis.Why is it done? How does/will the model react differently if the Imperfection is no introduced?

I wish to plot the graph of load v/s displacement for 1,2,3,4...10 times the critical buckling load during the post buckling analysis (Riks method). How do I do that?

ductility of carbon nanotube reinforced composites.

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HELLO,

I want to know if carbon nanotubes reinforced composites are ductile as I want to do hydroforming process by using ABAQUS or any other metal forming process that can be implemented.

If it is formable than what are values of yeild strength, ultimate tensile strength, plastic strain,etc.

the matrix material is polymer(PmPV).

THANK YOU.

How to model fastener with same force-displacement behavior for all translational directions in a plane in Abaqus?

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<p>Hi everyone. I want to model the fasteners connecting a wood sheathing to a steel frame in Abaqus. I want to input the same force-displacement behavior for all translational directions in the plane of the sheathing (like a radial spring). <br /> <br /> I was using spring element type Spring2 (nonlinear) but I could define behavior in only 2 translational directions in the sheathing plane (X and Z). This made my model overly stiff after the elastic range. I read about the RADIAL-THRUST connector element but it does not seem to be the one.

How to model fastener with same force-displacement behavior for all translational directions in a plane in Abaqus?

<p>Hi everyone. I want to model the fasteners connecting a wood sheathing to a steel frame in Abaqus. I want to input the same force-displacement behavior for all translational directions in the plane of the sheathing (like a radial spring). <br /> <br /> I was using spring element type Spring2 (nonlinear) but I could define behavior in only 2 translational directions in the sheathing plane (X and Z). This made my model overly stiff after the elastic range. I read about the RADIAL-THRUST connector element but it does not seem to be the one.

ABAQUS Tracer sets and Illegal Memory Reference error in restart analysis

Dear all,

I am trying to simulate a large deformation problem using the ALE method in ABAQUS Explicit. When I try to request a Tracer Particles output in a restart analysis Abaqus crashes and the log file states that the packager stopped for an Illegal Memory Reference error. Did anyone experience the same issue? I was running Abaqus 6.13 on Linux

Regards,

 

NL

Selection of element bsed on the location in abaqus using python script.

Hi
I'm facing problem while writing a script for a parametric study.
After changing the each parameter the model changes and and the loaction of the interested element changes based on those parameters.
Also the element number changes.
Is there any command in python script to choose the elements based on the location ? 

Thank you in advance

Rajesh Kumar

how to apply USDFLD to specific areas of a FE model

Hi, I'm modeling a composite box structure consisting of several fillet zones. Now I know only those fillet zones will develop progressive damage. The question is how I can apply USDFLD into only thiese zones, instead of making subroutine calculation of the whole model. I suppose there should be an argument to specify the range of elements  into subroutine calulation, anyone knows that? Thx

Nonlinear stiffness for cohesive behaviour

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Hi all,

 Does anyone know how to define nonliner (or exponential) stiffness for cohesive behaviour (for ascending branch before damage)? In CAE it's only allowed to enter one value

 Thanks

 Mo

Attila Kossa's picture

Introduction of the hyperfoam model in ABAQUS

Dear Researchers,

 

I am trying to find out which was the first ABAQUS version, wchich includes the hyperfoam material model. I haven't found any version history about this. Could someone tell me the very first version of ABAQUS in which the hyperfoam model was included?

 

Thank You!

Kind Regards,

Attila KOSSA

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