Temperature in restart analyses

[Anonymous]

Hello,

I have used a temperature load to simulate pretensioning of bolts, and because I have several load cases that I want to run from the same stress state after tensioning, I have attempted to create a new model and restarted from the last converged time step in the tensioned model. Then I simply add the loads I want, and continue the analysis from there. However, I have noticed that the temperature of the bolts (which I have modelled as beam elements) are not imported, and as a result the beam elements return to their "original" length and the model becomes entirely unconstrained. In the analysis parameters window, I have chosen "model file" as source of nodal temperatures. Is this wrong? Is there something else I should activate?

Best regards
Björn

[PipePakPat]

Bjorn,

The initial stress exists because the temperature load. If the temperature load is removed, then the state of initial stress relaxes. Your restart analysis will need to read the temperature load just as it did for the initial stress analysis to ensure the state of thermal stress is maintained.

Pat Tessaro, P.E.
Autodesk Inc.

[Anonymous]

Pat,

Yes, I understand that. But how do I read the temperature from the previous analysis, where I applied it? I simply applied the temperature load on the beam element as a part temperature in the MES, not through a steady-state of transient thermal analysis.

Best regards,
Björn