Adding material after execution of a step

[SassanR]

I have a structure which is initially at Room temperature. Thermal load is applied until the temperature reaches steady state. At this steady state a film is deposited to the structure. Then it cools to room temperature.

Question: Does anyone know how to add material, i.e., a part instance) after completion of first step?

 

[xerf]

*MODEL CHANGE or *IMPORT ?

 

[DanStro]

Have you looked at doing this as a sequential thermal analysis? I've used it to do a mechanical analysis after heating but I don't remember seeing anything in the documentation saying that it couldn't be a thermal analysis that follows the initial thermal analysis.

Dan

 

[SassanR]

Xref, DanStro,

Thanks. But here is what I mean

Step 1: Part 1 is a metallic part, say 2-D axisymmetric model. Heat is applied until it reaches a steady state temperature in Step 1.

Step 2: Part 2 is added to one surface of the axisymmetric model and the same heat application is used to reach a steady state temperature. This is a stress free temperature of the assembly.

Step 3: Part 1 & 2 are cooled to RT by removing all loads in order to obtain the residual stress of film at room temperature.

These need to be done in one model in order for the process to work.

Thanks,
SR

 

[xerf]

Can you try, Step 1 in a first analysis and Steps 2,3 in a subsequent import analysis were you add Part 2.

If I remember correctly import analysis has some restrictions. You should check the documentation for relevant information and examples on doing import analysis.

 

[mrgoldthorpe]

My rather old-fashioned way of doing it would be

** Start with entire model
...
*INITIAL CONDITIONS, TYPE=TEMPERATURE
All, 20.0
...
*STEP
Step 1 Remove Part2 from entire model
*MODEL CHANGE, REMOVE
Part2
...
*STEP
Step 2 Do thermal analysis for Part1, cooling to steady state
...
*Step
Step 3 Add Part2
*MODEL CHANGE, ADD
Part2
...
*Step
Step 4 Do thermal analysis for complete model
...