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Regarding the application of continuous forced displacement in Optistruct

I have a board now, and I need to move it up 50mm in the first working condition. In the second working condition, I need to move it up 20mm on the basis of working condition one. In the first load step, I used SPCD to move it up 50mm, and in the second load step, I used forced displacement to move 20mm and continuous load step. However, the result is that the first working condition moved up 50mm smoothly, but the second working condition did not move 20mm relative to the first working condition, but moved 20mm relative to the initial state. What should I do to achieve the desired result?The board below is just my reference

1.fem

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Alberto Campagna

Hi,

you have to add the second displacement on top of the first, so it will be 70mm in the 2nd lc not 20.

Alberto

Jin1

I changed the forced displacement to 70mm, but in the second analysis step, the initial state is not the calculation result of the first analysis (I have already turned on the continuous load step), but the initial state at the beginning

Rajashri_Saha

You need to add both the loads in 2nd loadstep as suggested by my colleague Alberto. Use SPCADD and combine both the SPCD load collectors (50mm and 20mm). call this new SPCADD load collector in 2nd step. No need to modify 1st step.