OptiStruct Lessons Learned from a Cambered Structure with Welds made Post-Decambering using Modchg

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Problem Description
- A pre-cambered trailer is loaded to nearly flat under 1g down by a permanent payload (large steel transformer oil reservoir box).
- As the payload is loaded, the trailer is 'de-cambered." They payload is then welded in place to the trailer.
- Other operational load cases are applied as the subsequent load cases to the de-cambering load. Topology optimization is conducted with responses from both de-cambering load case and subsequent load cases.
- All subsequent analysis must take into account the de-cambering held in place by the welds. The de-camber is a "large displacement" formulation and the loading happens via sliding contact with the payload box.
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