Need help solving coupling temperature and displacement analysis

[CPHE]

I have three parts to model but once I determine the correct method I will be fine with the other two. The design is a simple C-Ring which I have used only half of it as its symmetric. It is in mm and I think I should put it in m just for ease. I have all the material data I could possibly get density, thermal conductivity, plasticity, elasticity & specific heat. I have made my step a coupled temp displacement, initally set time period to 1000, Nlgeom is on. I have made the load a negative surface heat flux on the step mentioned and may have to change it to m as the heat flux is appears to be too small for abaqus. The boundary conditions are fine. However the final boundary condition I have is a temperature BC of 1600 degrees C. This BC is on the step, not sure if it should be on the initial. The mesh is a hex coupled temp displacement. Just wondering if someone could tell me if im going wrong somewhere or whether i should switch to metres insead.

Any help really appreciated. Can send on the part file or screen shots if needs be.

 

[bothul]

Hello,
I have used the units - N, m, s, kg - since most of the thermal properties use powers of these quantities.
In order to have displacements in your model you need the coefficient of thermal expansion.

It's not much but hope it helps

 

[n3l3]

Hi,

Dont know if i really understand the prob. If this is just unexpected results then use SI units as bothul says, thermal coeff as:

Alpha=(change in length)/(original length*change in temp)

Temp in ºC.

anyway I would check it out at first in a simple beam model to be sure.

cheers.

 

[bothul]

Dear n3l3,

Since you recommended a simple beam element, I would like to ask you if you know any method to assign a temperature loading to a wire part (section beam)in order to obtain an element(column modeled as wire)which has a linear distributed temperature over the cross-section. Just like the temperature on one side is T1 and on the other side is T2.

Thank you!
Bothul