First a heat transfer step must be done where in field output you add these commands :

*Output, field

*Node Output

NT,

*Element Output

HFL,

*Node fil

NT,

**

Next you build a static step where you read the file.fil (from the thermal part)

** FIELDS

**

** Name: Field-1 Type: Temperature

*Temperature, file=E:/Y_Joliff/decouple_thermique, bstep=1, binc=1, estep=153, einc=153

**

I send you in attached documents an exemple.

First a heat transfer step must be done where in field output you add these commands :

*Output, field

*Node Output

NT,

*Element Output

HFL,

*Node fil

NT,

**

Next you build a static step where you read the file.fil (from the thermal part)

** FIELDS

**

** Name: Field-1 Type: Temperature

*Temperature, file=E:/Y_Joliff/decouple_thermique, bstep=1, binc=1, estep=153, einc=153

**

I send you in attached documents an exemple.

Files

Files

Thank you Yoann. You means that both of heat transfer and static steps must be defined in a single model, or in two different models?

For an uncoupled study You must build two differents models : first based on heat transfer step and a second based on mechnical step.

With only one model I think you must build only a fully coupled thermomechanical study (ie temp-displacement step) to solve your problem.

I send you the same exemple in a coupled thermomechnical approach in abaqus

Maybe you can try to use Mesh-to-mesh mapping feature in Abaqus.

You will need two models. In the first one you analyse the heat. Then you can import temperature results into second model as analytical field, by using just the ODB file from the first model. You can define in the second model initial state as predefined field with regards to previously defined analytical field. Also, with this feature, you can use different meshes in your models.

To define the analytical field go to: Fields>Analytical field>Mapped field>ODB mesh>then select the viewport where you have temperatures from the first model shown as a contour plot.

You will need two viewports: one with the second model (mechanical step) and another with ODB from the first model.

Good luck

I added this commands to *.inp file. but, after solution there was not any *.fil file.

*Output, field

*Node Output

NT,

*Element Output

HFL,

*Node fil

NT,

**

Regarding your last reply: the command should be at very end of .inp file. It shoud be *NODE FILE.... For the eigenmode analysis as imperfections I use the following:

*NODE FILE,GLOBAL=YES,LAST MODE=6

U

*End Step

If you want to get rid of doing two cumbersome sequential analyses, and do it in one simple simulation, use coupled analysis.

The tricky point is when the real problem actually is decoupled, not Coupled!

In this case, you should choose Solution Technique to be SEPERATED. (In coupled analysis)

Read further on this material on ABAQUS User Manual (version 6.12)- Vol II - section 6.5.3

I am doing the same problem. However, I already have Temperature history (X,Y,Z,Temp) and saved in simple text file. I need to calculate the stress/strain based on these temperatures. One thing, I am assure I do need only Stress analysis. However, do not know how can I use that file of Temperature history within ABAQUS CAE.

Any comments/suggestions would be appreciated.

Reply to Nadeem Qaiser; First, do heat transfer analysis to obtain a temperature distribution through the part. Add "Node fil" before "*Output, history, frequency=0" to your keyword via: Abaqus main menu/ Model/ Edior Keywords

Then save your file. At this time, a file with .fil format musb be created in the working directory.

Afterwards, start second thermomechanical analysis and select that .fil as prescribed filed.

Dear Amir Atrian, Thanks for your reply.

However, as I already have temperature field(X,Y,Z) in .txt file In load step: I can not create predefined Field of "Temperature" or also can not apply Temperature as BC when I use Heat transfer analysis.

It brings me back to my original question how to link /import that .txt data of Temperatures into ABAQUS analysis?

To Nadeem: Have you tried to use the mapped field? In Abaqus/CAE go to: Field->Analytical Field->Mapped Field. Than you can define value for each (X,Y,Z) point by pasting the table to Abaqus. Later you can use this Fiel for whatever you want.

Moreover, you can use the Field to define the Predifined field in a General/Static step if you are only interested in stress/strain distribution for a system with given boundary conditions, but you have to define the Expansion property of the material that you use.

To Marko: Thanks , Yes that is the one solution possible for ABAQUS versions 6.11 or above. Unfortunately, I am using ABAQUS 6.10 version, so I am not able to locate mapped function in Analytical field. Here, I can only give through expression

but in my case, temperature field (x,y,z) is not following any particular expression.

Therefore, hard to link. Some way to get the expression based on my data? OR any other suggestion?

Hello all, I am dealing with a thermal analysis of a structure. I want to try simple input for a beam element in two cases: constant temperature on the beam(wire) and gradient function temperature. The output of the analysis can show TEMP and NT. For TEMP the values are displayed for SP1, SP5, SP9 and SP13. In case of constant temperature definition, I get different values for these four variables. Can anyone help me clear the exact meaning of SP and NT?

Thank you,

Daer Ioan

I think you can find about these variables in ABAQUS documentation. As I remember, NT means "nodal temperature".

@loan Both: I will agree to Amir Atrian. Moreover, in short: SP stands for section points of your cross section and NT: Nodal temperature.

I hope it helps.

Thank you for both replies. They were helpful. My question wasn't formulated correctly. I was trying also to find out which of the output is used in the analysis. By reading the Manual it seems that NT.  But I couldn't find why for a constant temperature field definition in the element, SP1->SP13 are different?

Good look with research.

In Abaqus/CAE go to: Field->Analytical Field->Mapped Field. I can define value for each (X,Y,Z) points.But the step time and increment can not be defined. Any other way to import a txt file with XYZ and temperature value to implement transient analysis ?

Hello, I am currently working on the buckling analysis of cold-formed steel channel section. I am looking for answer how i can create nodal temperature output (.fil) from heat transfer analysis and how i can use this file into buckling model in ABAQUS?

In the same way, is it possible to do coupled analysis for static and dynamic. I want to do nonlinear static analysis beyond yield and then carry out transient dynamic analysis to obtain modal data at different stages of loading.

Dear Elias

Please see the comments of Yoann Joliff and me at 24th Feb.

Hello to all, I'm working on seismic analysis of suction caisson foundation embedded in soil domain. I have to apply earthquake accelerograms in horizontal and vertical directions at the base of the model  and I want to define, always at the base, dashpots in horizontal and vertical directions (directions of two acceleration). First, I have to make some static steps in which I apply some static forces, so in these steps I can't put vertical dashpots at the base of my model because the analysis doesn't run. So I have to calculate, first, static steps with specific BCs at the base and after I have to transfer results (stress,forces,strains,displacements) to an other model in which I make seismic analysis with dashpots. It is possible? If this is possible, how can I make this?

Any comments/suggestions would be appreciated. Thanks to everyone!

@Amir Atrian: I am doing thermo-mechanical analysis ith abaqus. I saved the .fil file  during thermal analysis and now I want to run it for the mechanical analysis by reading fil file. but I don't know if I can run it without any subroutine or I need to write a subroutin?

Mina

No, it does not need any subroutine for the second analysis and just you must creates two similar models (1st is thermal and 2nd is mechanical).

 Hi AMir

Thanks for your reply. I wonder how should I develop a line to read the .fil in the input file in the 2nd analysis?

Dear all,

I am doing thermomechanical analysis in ABAQUS. But I wonder can I transfer the temperature output from heat transfer analysis into mechanical analysis which having different geometry? Thank you.

Mina and Nazirah,

Please look at the comment from Yoann Joliff. Once you have the heat transfer analysis, there will be .fil file been created, and in your secondary analysis, you have to include this .fil file in the predefined field.

Dear friends

Mina: you should modify .inp file from ABAQUS main menu-model-edit keyword to obtain .fil file after 1st analysis (how and what modifications can be found in previous posts)

Nazirah: Do you want to transfer your 1st analysis result to second different model? what is it? it is not scientifically correct, because both the model geometry and meshing must be identical. 

Let say if i have a circular plate of 50mm radius directed by a laser pulse.

When i do a heat transfer analysis, the temperature increase is confined to a considerably small region at the area of laser heat flux is directed. (eg: 1mm radius).

So, can i just built a plate having  radius of 1mm-2mm and analyse with heat transfer analysis, then transfer the result into mechanical analysis. In mechanical analysis, the whole model is built.

Nazirah

You can do this by manually entering the nodal temperature for the 2nd analysis or do same as described in previous posts...

Amir 

Hello,

Is there any difference between transferring nodal thermal results during time from a heat transfer analysis into new static-general analysis to see both pressure and temperature effects with applying both pressure and heat simultaneously in couple temperature-displacement analysis?

Dear Shaghayegh

They are essentially different. The types of analysis depend on the nature of your problem. As an example, assume a plate with displacement constraint under thermal loads. Thermal loads make thermal strains (expansion) and due to boundary conditions some stresses are induced through the plate. For such a problem, you have to perform a coupled temperature-displacement analysis in which the nodal temperature is obtained at first analysis and then they are used as the predefined field for the second analysis.

In some cases, it is not possible to apply both the mechanical and thermal loads simultaneously.

I hope my explanation be helpful.  

Amir  

Dear Amir, 

 I am running the sequentially coupled thermo-mechanical analysis. and I am getting the following error after running the simulation. 

The following file(s) could not be located: >> Path for the same thermal .odb file

Sushant

Sometimes if you change the location of working folder directory, this problem will be removed.

Thanks amir.

Problem is solved. Instead of giving the path, I just wrote the name of the file and it accepted. Need not change the file location.

Hi,

I kinda have the same question. Except that I have two static steps and I want to transfer stresses results to an explicit dynamic analysis. Is it possible to do so?

Thanks,

Negar

Negar

You can simply import the results of your first simulation (.odb) to the second simulation through the predefined field (in load module). Try it.

Amir

Zsombor

How did you define residual stress in 2nd simulation?

 Hello All,

With regards to Yoann's comment, I was wondering how you determine the begin and end step for a decoupled thermal stress analyis on abaqus when importing the temperature field from the thermal analysis?

Thank you!

Jose

What do you mean about "begin & end step"? explain more..

Amir,

Thank you for the quick response. I am referring to when you begin the structural analysis and you define your predefined fields (Temperature field in this case for a decoupled thermal-structural analysis). Once you define the region where you will apply this temperature field, you must also specify the begin step, increment, end step, and end increment. My question is, how to fill in those sections appropriately?

Much thanks!

Zsombor

As indicated in ABAQUS documentation, there are just two ways to create residual stress (initial stress):

1-modifying input file (in Abaqus main menu/ Model/ Edit keyword/ Model 1)

2-Using subroutine SIGINI

for the 1st case it is required to add below commands before the "**step":

*initial conditions, type=stress

, Sxx, Syy

I hope my reply is helpful

Amir

Dear Jose

As I know, the initial temperature in the 2nd analysis can be defined just as the "predefined" field in the "1st step" and the ABAQUS solution propagates it itself for other subsequent steps. Number of increment is also related to your analysis and must be tested.

Amir 

Hi all,

I am new to ABAQUS  thermal modelling. I have got the fire test data for thin plate steel panels. The thin panels were exposed to the fire and I have got the temperature time curves/data as well as the deflections produced in the panels at different points in time. Moreover, I have also got the mechanical boundary conditions of the panels. I want to compare the test results with the  ABAQUS modelling. Any suggestions which analysis procedure I’ll be using such as static general, heat transfer, coupled temperature displacement etc. Thanks

Naveed

You must use a fully coupled temperature-displacement analysis.

Hi Amir,

Thanks for your swift reply. Can you please provide me with any suggestions for using coupled temperature-displacement analysis? is there anything useful available in the literature regarding temperature-displacement modelling that you can recommend for beginners. Thanks

Hi all,

I am new to abaqus. I had to do get the results from single analysis and use it for another one. I did as was suggested in the post By Marko Pavlovic and Amir Atrian, by adding "*Node file" in the end of the file using edit keywords. However i am unable to get the .fil file. I get all the other extensions like .rpy,.jpl,.rec etc but not the .fil file.Attached is the .cae file.

Morever I get an error when I try to edit the keywords again, in cae model, the error message #32, This file is being used by another process (siemerged file, not sure what this is).

Edit 1: Unable to attach the .cae file due to error message.

Edit 2: tried changing directories but no avail.

Hi all, for the mapped field, hope this helps..