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Found 7 results

  1. Hello, I have a simple question: While selecting boundary conditions I have the option to select SPC or SPCD? What are the differences between them? I have used SPC to force initial displacement or rotations of nodes. What makes SPCD special? what can i do with them. <Thanks in advance!
  2. Hello, I want to transfer Displacements from a model to a submodel. I used "fields" to Import the .op2 file and then Realization to create SPCD's (one for the Displacement(x,y,z) and one for the Rotation(x,y,z)). I used the Card Image SPCADD to combine both. Then i created SPC load collector for all six DOF at the nodes where the SPCD's are. Then i created a load Step and put at subcase Definition SPC to SPC and SPCD to LOAD. If i start calculation i get the error: "* ERROR # 1908 *** Case Control data LOAD=4 is not referenced by any bulk data relevant for used subcase type." (LOAD 4 is the SPCADD load collector) So is it not possible to Combine SPCD's with SPCADD? How can I do it instead? If it helps i can upload the file?
  3. Hello, I used "fields" to transfer displacments and rotations from a model with a coarse mesh to a model with a fine mesh. There are different Interpolation Options available. How can I read (show) all displacements/rotation in the createted SPCD's (maybe in a table) before solving?
  4. Hi! How can i convert FORCE in SPCD? i need to apply that force like is an acceleration. Thanks
  5. Arul

    ASET Card

    Hi , What is the differences between ASET1 & ASET card in Optistruct?
  6. Dear All, can you please help me with, How to apply enforced displacement on shaft and fixed constraints on hub as shown in figure. i'm confused in load collectors, where to assign spc and where to assign spcd and in which collector. also want to know about search distance option what it means actually. is it a gap between contacting bodies? regards, Ganesh
  7. benf

    ERROR 320

    Hello, I'm trying to run a topology optimization on a 3D volume meshed with tetra elements. the objective is to minimize the Weighted Compliance. The responses I've chosen are : - weighted compliance - Vol Frac the constraints are : - VolFrac <0.1 - max stress < 870 MPa (via STRESS input in the DTPL card). I get the following error message: " *** ERROR # 320 *** Static load case 1 has prescribed displacements. The combination of global stress constraints and prescribed displacements is not meaningful. Optimization cannot be performed." I hardly see why it is not meaningful to use global stress constraints with SPCD... does anybody have a solution? Note: the SPCD is applied on a single node which is connected to the volume using a RBE2. Do I have to remove the area close to the RBE2 from the design volume?
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