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Abaqus cylindrical

I am currently simulation arc welding process. i have performed plate butt welding using abaqus software. Dflux subroutine was used and the heat source model i used is goldak double ellipsoidal model.

Now i want to apply this technique to the welding of pipes, but currently i am having difficulty with the nodal coordinates. I have defined my glodal CS to cylindrical coordinate system in part and assembly defintion. But after generating the mesh the input file contain nodal coordinates in cartesian coordinates.

Viscoelasticity in Abaqus

Hi All,

 I would like to use Abaqus to model the viscoelastic material  behaviour of a polymer.


I have material data from a simple uniaxial creep experiment (nominal strain vs time).  I tried to use the viscoelastic material model in Abaqus.  I am a bit confused as to how I need to enter my data (what format). 

The manual says I have to specify the normalized bulk and normalized shear compliance

Unconverged Mohr-Coulomb Plasticity, ABAQUS

Dear Abaqus Users,First of all, I want to clarify that I am a beginner in Abaqus (only few months) and new in iMechanica. I have been modeling an excavation in Abaqus/CAE. I am using several layers of soils which have been modeled using Mohr-Coulomb model, the wall as an elastic material. Both the wall and the soils were modeled with 2D solid elements (plane strain).I have been facing with lots of problem with the interaction of the first layer and the wall, "UNCONVERGED MOHR-COULOMB PLASTICITY" in the GEOSTATIC STEP!!!!.

Glued connection in Abaqus

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Hello,

I am a new user of Abaqus and need to model a glued connection between 2 solid elements (the nodes on both elements must have same displacement, no relative movement between them). In other software (cosmos/m for instance) this is accomplished by merging these overlapping nodes.

 

I need to do this in Abaqus, looked in the huge Abaqus documentation, but it is hard to find this for complete beginner. Please help.   

KevinGE's picture

How to use mohr-coulomb criterion to simulate the indentation of BMGs in ABAQUS?

I encounter a big challenge now.

I wanna use mohr-coulomb criterion to simulate the indentation of BMGs in ABAQUS.However, there are many parameters confusing me.

We know the  mohr-coulomb can be written as:

                            τc=k0-ασn

where τc is the shear stress on the slip plane at yielding, k0 and α are constans and σn is the stress component in the direciton normal to the slip plane.

Connecting ABAQUS with MATLAB

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Hi,

Does any body know if MATLAB functions and scripts can be called into an ABAQUS subroutine like UMAT?

 

Alankar

Graduate Student, Washington State University, Pullman, WA

python script error

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Hi
I have script written in phyton and get following error when try to read history data.
I will appreciate any help.
thanks and regards,

ERROR:

Neither set named 'PIVOT' nor region named 'ElementSet PIVOT' found.

***COMMENT: History output is available at the following points ['Element PART-1-1.701', 'Element PART-1-1.908', 'Element PART-1-1.909', 'Node PART-1-1.901', 'Node PART-1-1.902', 'Node PART-1-1.903', 'Node PART-1-1.904']

Masayuki Wakamatsu's picture

Crack Length in Cohesive Element (ABAQUS vr 6.7.1) in pure MODE I case

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Help! imechanica!

This might not be a smart question to ask, but if any of you can help me, it'd be great.

 I have a DCB (sandwitch specimen) with a cohesive element in the middle. Studying pure Mode I case, displacement is applied at the end of the DCB. Cohesive element works great (it fails when one reaches max separations).  But I am having a difficulity in extracting crack length (i.e. length of failed cohesive element) vs time step. I looked for Damage and Status commend, but it's not promising.  (I'm pretty new to ABAQUS....)

msd.jacob's picture

Composite Solid

Hi All,

I am analysing a fiber composite solid plate with a large and small holes. The model is meshed with C3D8R elements. The output has U and RF in global CSYS and S, E in local CSYS. I have problem in reading  S and E written in local CSYS. I know it is very simple, but I cant able to figure it out. Those who know, how to read the S and E in local CSYS, please help me. Tks in advance for your time and advice.

Regrads

Jacob 

difficulties CONTACT problem with plasticity using ABAQUS FEA code.

Hello everyone:

1.  I have built a FEM model 2D plane strain using ABAQUS/Standard (CPE4R) elements,

2. I am  modeling the contact between a cylinder and a plate in 2D.

3. The Cylinder material is given is ELASTIC ISOTROPIC material with no plasticit E=310 GPa

4.  The plate is with a Ramberg-Osgood plasticity with a Young's modulus E=210 GPa.

5. The mesh at the the contact point is VERY refined element characteristic length is about 1 micron. (My model units are  (mm,N,sec)).

Extended Chaboche viscoplastic model for cyclic loading

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These days I've been applying oneself to implement the Chaboche viscoplastic model in ABAQUS user-subroutine for simulating the cyclic loading in single crystals.
The procedure can easily get out. I'm not sure about the problem, the deduction of Jacobian, the convergence? 
Btw, I know there is free subroutine for crystal plasticity by Huang YG. I wonder if the UMAT routine for chaboche model is available, then I can generalize it to fit for my case.
If pity there isn't, guide or example for viscoplastic model can be of great help also.
Thanks a lot

Freqency on abaqus

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I am trying to create a model of a travelling wave ultrasonic motor and have found it difficult to find out how to apply the natural frequency of a steel ring to it at two seperate points, seperated by an angle of about 11 degrees. Any ideas or help would be appreciated.

Abaqus frequency solution

I am trying to create a model of a travelling wave ultrasonic motor and have found it difficult to find out how to apply the natural frequency of a steel ring to it at two seperate points, seperated by an angle of about 11 degrees. Any ideas or help would be appreciated.

torque

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Dear, I use the abaqus present , how can apply a tightening torque between an implant (screw) and the bone with abaqus......... thank you

 

EFD or CFD Softwares Help

Please, I need some EFD or CFD software that has an Student Version. I have to make an analysis Solid-Fluid and vice versa, but i have no software to make that.

Now I'm using Pro/E to make Streches and statics analysis, but i cant do any EFD or CFD without any patch or software.  Anyone knows any?

 

Tanks! 

azadpoor's picture

Sharing ABAQUS UMAT and VUMAT subroutines

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I have noticed that a lot of people are using UMAT and VUMAT material model
subroutines for their researches. However, most of these subroutines do not
find their way to free code market and remain in the hands of the developers.
Therefore, a lot of wheel re-inventing has to be done by other people. Since
development and testing of a material subroutine takes a damn long time, I
think it is a good idea if each of us can share the subroutines she has
developed with the others. I know that a couple of subroutines are publicly

azadpoor's picture

Sharing ABAQUS UMAT and VUMAT subroutines

I have noticed that a lot of people are using UMAT and VUMAT material model
subroutines for their researches. However, most of these subroutines do not
find their way to free code market and remain in the hands of the developers.
Therefore, a lot of wheel re-inventing has to be done by other people. Since
development and testing of a material subroutine takes a damn long time, I
think it is a good idea if each of us can share the subroutines she has
developed with the others. I know that a couple of subroutines are publicly

reinforced concrete walls under cyclic (quasi-static) loading in ABAQUS

Hi,

I started modelling the
behaviour of the reinforced concrete walls under cyclic loading using
ABAQUS/Explicit
.  I used a shell element part with solid homogeneous
section and defined the concrete behaviour using concrete damaged plasticity
material definition. Embedded truss elements were used to define the steel
rebars. In 2 different steps (left and right) I defined the cyclic loading (in
plane) as imposed displacement (using amplitude-smooth step).

My question are:

angle-ply laminated plate model

I am trying to built a model for a laminated angle-plied plate, which has different fibres orientation in each plate. But I have a problem in materilas property as the Abaqus told me after analysis andmake error. The error is that the properties of the model in not assigned well. I have assign them as shell composite and make the local co-ordinate orientation.

I have tried to use homogeneous material and enter the Engineering contants in all directions and by just changing the local axis orintation, it works. But I don't know if this is right or not.

Need advice plz

ravitejk4u's picture

Display Group Option in ABAQUS

Hi everyone

can anyone tell me how to use "display group" option in ABAQUS.

i have to find the total reaction force of set of all nodes on a particular surface. i had tried many times using "display group" option. but couldnt succeded.

or is there any other option to get the data from those set of nodes on a surface.  we have this kind of option in ANSYS, but what will the corresponding feature in ABAQUS.

Please help me in this regard. 

 

cheers

Ravitej 

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