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Thanks a lot.

Any suggestions ?

Hello, I was wondering if it is possible to apply a tie constraint in a particular step in Abaqus ( while running a multi step analysis). My simulation is a 3 step process. The first step involves the assembly of 2 concentric cylinders, by making a plug move through the inner tube, expanding...

Hello, I'm trying to model a tube drawing process, where the draw plug moves through the inner surface the cylinder along its length, thereby expanding the tube. My model runs in abaqus explicit, but takes forever to converge. I'm surprised that an axisymmetric model takes this long. Below is...

Ok I faced a similar issue a while back where I had to input residual stresses from a static analysis into a fully coupled thermal stress model. I figured that there isn't a way to specify initial residual stresses in Abaqus withouyt using the subroutine. this is what i did Step1 : Fully...

What is the reference temperature used by Abaqus in the event that an initial temperature isn't specified by the user ? My guess is that it uses 0 C or 273 K, but I would like to reconfirm the same. Thanks

settler - i haven't had the need to model a physical fluid cavity at any point. but i looked around online and one post had suggested that if it is required to have a fluid then you would probably have to run a co-simulation of abaqus explicit and CFD. i had suggested a box ( ie a closed region)...

Dnov - I'm just curious how to 'request' a restart file. My analysis bails out as it cannot find the *.res file. Your reply could be very helpful.

hello, my goal is to perform a static analysis on a 3 cylinder composite by applying an internal pressure on the inner cylinder to begin with. this would be to assemble the cylinders by bringing them in contact. once this is done i would like to perform a fully coupled temp disp analysis where...

create a box or cylinder that contains your liq. i would use a box as you dont have to deal with cylindrical coordinates. i will leave it to you as how to how design this box based on your problem. create a horizontal partition to separate the liquid nitrogen region from the other region. you...

I would like to know if there is a way to output the heat generation rate (W/m^3) in the Abaqus odb.I have a curved beam to which a non-uniform heat generation is applied. Qgeneration = f(thickness,length) I would like to get an output of the applied heat generation to the curved beam just to...

Thanks for your help. Under normal behavior , I had unchecked the 'allow separation after contact ' box. That was causing a negative contact pressure.

Thought I'll attach a separate plot of COPEN .http://files.engineering.com/getfile.aspx?folder=0ee50de8-88af-4b6e-9586-f77e6a064d23&file=COPEN_plot.jpg

From 0 to 240 degrees I have positive COPEN values(vertical axis on the right has the location of its origin slightly different from that of the primary axis on the left ) and negative contact pressures. The COPEN graph does show negative COPEN values at certain locations in the...

and here is the COPEN plot . Thankshttp://files.engineering.com/getfile.aspx?folder=22e330c1-611f-4cdf-b1bd-e2bc13a4a70a&file=COPEN_plot.jpg

I did plot COPEN for the outer tube and my COPEN values are of the order of 8e-10 meters and corresponding contact pressures of the order of -3E06Pa . In another model when I had a separation of 4e-06 meters I got a zero contact pressure. Is this because , the value 2e-11 meters is so small...

I can relate to what you are saying. So does open up , the contact pressure on the slave surface will be zero since no contact is being made. Is that right ? I'm seeing contact pressures of the order of -4E06 Pa to -2E09 Pa Thanks for your help.

Hi, I have a working model of 3 concentric cylinders with the cylinder in the middle being the master surface and the other two being the slave surfaces. I have a pic attached of the model , which would better represent my question. A gap opens up between the middle cylinder and the outer...

The analysis user's manual section 7.8.1 states that the *SYMMETRIC MODEL GENERATION option is not available for models defined in terms of an assembly of part instances. I guess you cannot use it when you have an assembly of instances.

Yeah I did the 2D axisymmetric analysis and was looking to do a symmetric model generation to convert it to 3D , but the user's manual states that the symmetric model generation cannot be used for models defined in terms of an assembly of part instances. So I guess this option is ruled out ?