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Local material orientation Abaqus

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Dear All,

My name is Ronald, student at Eindhoven University of Technology, master Structural Design and i have an import question about the FEM programme Abaqus, about orthotropic materials.

I defined an orthotropic or anisotropic material in Abaqus by using the option; engineering constants or orthotropic (all linear elastic).

Abaqus asks for the modulus of elasticity in direction 1, 2 and 3 and the shear modulus and poisson ratios.

So far so good.

Run ABAQUS subroutines written in Fortran

Dear colleagues,

 I am a beginner in using ABAQUS subroutines, and currently come into the problem of running ABAQUS subroutines written in Fortran.

I have installed ABAQUS 6.11-1, Microsoft Visual Studio 2010, and Intel Visual Fortran Studio XE 2011 on my computer. However, when I run the test codes, there are the following errors:

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Abaqus/Standard computational time

Dear colleagues,

 

is there any technique to reduce a computational time in Abaqus/Standard like it can be done in Abaqus/Explicit using an increase of the loading rates and performing mass scaling???

 

Thank you in advance!

 

Best regards,

 

mlx22 

Modeling non-linear material

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Dear all

I would like to model two non-linear material as shown in the pictures in ABAQUS. But I can model it with its non-linearities. The model has been created with beam element. I used the classical elastic-plastic model using calibrations but because of elastic non-linearities the calculated plastic strain comes negative. please help me howI can model it

regards

Vinicius Aguiar de Souza's picture

Two-Dimensional Analysis of Equal Channel Angular Extrusion using ABAQUS

I am trying to model ECAE in ABAQUS, but I have a problem regarding the boundary conditions.Does anybody have experience with this problem?

Abaqus- Nodal force and Reaction force

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Hi,

What is the difference between the nodal force (NFORC) and Reaction force in abaqus. I applied some displacement in my model, when checking the Reaction and Nodal force at the same node, Nodal force is just half the reaction force. Then I did some experiment and applied some load on a node, after solution when i check the nodal force on the same node, it is half of the applied load. Why is it not  same as the load I applied? I am confused. Please help me.

 Thanks,

Anshul

Turning simulation in ABAQUS

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Hi,

I have to perform thermomechanical analysis of turning process in ABAQUS as a part of my project.

Is there any documentation or tutorials available for it?

Kindly provide me with links if it is available.

Thanking in advance.

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Young Modulus as a function of step

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Hello,

Does anybody know how change part material during caluculations (between steps) in ABAQUS.

I need to modifie Young modulus of one part in my calculations after first phase of loading.

Thank You in advance 

Anna

Anna G's picture

Young Modulus as a function of step

Hello,

Does anybody know how change part material during caluculations (between steps) in ABAQUS.

I need to modifie Young modulus of one part in my calculations after first phase of loading.

Thank You in advance 

Anna

 

About beam element in abaqus and ansys

I am interested in using beam element to do a nonlinear static analysis (may need to a dynamic analysis in the future), but have trouble to understand some of the key features of beam element in abaqus or ansys. My goal is to find a beam element (preferably general beam section) with a defined stress resultant yield surface (e.g., P-M-M yield surface). If possible, could also account warping degree of freedom.

ABAQUS

How can I apply concentrated load on internal nodes?

Hello All

I have a problem in which I have to apply concentrated load on the internal nodes in specific directions.

Is it possible to apply concentrated load on internal nodes (nodes which are not on the boundary) in Abaqus, or any other FEM software?

 

Is it possible to for exampleuse static condensation method and define subdomains in the body and apply concentrated loads on theoundaries of an arbitrary domain? 

 

I would be thankful if you could help me. 

 

Masoud

Abaqus Low cycle fatigue - Hysteresis Energy Criteria

Hi,

I am trying to do Low cycle fatigue analysis in abaqus, and
according to the Documentation, for bulk material damage initiation and damage
evolution definition, I can use the criteria (and type for Damage evolution) as
"Hysteresis Energy". And have to define 4 material variables C1 to
C4.

But in the abaqus material library (in abaqus-CAE) i could find
all the other criteria but not the "Hysteresis energy". I also tried
to define it in the *.inp file but abaqus could not read it (apparently wasn't
writing it correctly).

Abaqus Low cycle fatigue - Hysteresis Energy Criteria

 

Hi,

I am trying to do Low cycle fatigue analysis in abaqus, and
according to the Documentation, for bulk material damage initiation and damage
evolution definition, I can use the criteria (and type for Damage evolution) as
"Hysteresis Energy". And have to define 4 material variables C1 to
C4.

Abaqus - INP file number precision

Hi all!

I am working in a design optimization process MATLAB-ABAQUS and i need that abaqus writes the nodal coordinates in the inp file with at least 12 significant digits. If i change nodal output precision to full in the job manager i only get 9 digits.
I already changed numDigits in session.journalOptions.defaultFormat, session.journalOptions.fieldReportFormat and session.journalOptions.geometryFormat by submitting in the command line

How to update solution-dependat variable (SVARS) during iterations

Hello everyone,

 I am implementing a uel user subroutine in ABAQUS. This uel is for modeling contact in X-FEM framework. Thus, it's a nonlinear problem and I need to store some solution dependent variables during each iteration. I know I can store SDVs in SVARS. But this vector will update at the end of each step, and not during iterations. Anybody knows about this problem?

 I really appreciate if anybody can help me with this.

    Thanks

    Ehsan 

Meshing difficulty in viscoelastic constrained layer damping

Hi,

I am simulating constrained layer damping with viscoelastic layer in Abaqus.

Used 3D continuum element - C3D20R for base an face sheet and and same with hybrid 

formulation C3D20RH for visco tape.

In FE mesh, I tied the nodes (through tie constraint) of base with that of visco tape and 

also the visco tape with that of face sheet. But in the deformed mode shape, I am finding 

the visco tape fully penetrated inside the casing (I guess as there is no contact, only tie 

constraint).

ABAQUS Explicit - defining boundary conditions and imposed displacement on rigid bodies

Hello there,

 I am currently trying to model a cold-formed steel beam experiment, where load is applied through displacement control. I thought using ABAQUS/Explicit and perform a quasi-static analysis would be a good idea.

 However, I have found an error I have not yet been able to overcome, and the results are not as I expected.

Here's the warning message:

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how to calcualte total reaction force in a plane in ABAQUS

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Dear all,

This is my first post in iMechanica forum.

I am trying to some simulation of cantilever beam bending in abaqus. Since the aspect ratio is pretty low (height/diameter~=2), I use 3D solid element instead of 2D beam element to construct the beam. I set the deflection at the free-end as the boundary condition, and try to solve the reaction force (perpendicular to the beam longitudinal axis). But I get in trouble to calculate the total reaction force at the free-end.

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Section assignments for large assemblies in ABAQUS CAE

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I am getting started with ABAQUS, and so far, I have had to assign a section property to every part of the assembly, which takes a long time for large assemblies. Often the entire assembly has the same section assignment. Is there a way to assign the same section to various instances?

 

I thank you all in advance.

 

 

defining points in 3d, changing coordinates system ABAQUS script

hey guys please help me, 

 i need to define my revolution points i.e. the circle by x.y.z. coordinates and i dont know how to do that.

 if that is not possible please tell me how can i change the system to cyclindrical coordinates please.

 i
have to draw a spring and for that i know the points in cylindrical
system. i cant define in 2d as for less than 90 degree it will not be in
xz or you know like that plane. it will also be helful to define plane
if i can.

output of abaqus

In the output of abaqus, why there are more than one stress values at the same time?
Thank you so much.

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