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mansin

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  1. Hi, I have been confused by the parameter G in GRAV bulk data entry. I think this parameter is the acceleration of gravity. If I use the unit system of “kg, N, mm, MPa”, Should the parameter G be set to 9810 ? I found that If I set G to 9810, the displacement of the structure in the case of gravity is too large. Gravity.hm
  2. Hi, Q.Nguyen-Dai Thanks you very much for your sample script.
  3. Hi , I wanted to mesh a lot of lines with variable lengths in model by using tcl script, but I found the sample script in help is not intelligent, for example *createmark lines 1 15 18 *linemesh_preparedata lines 1 30 *linemesh_saveparameters 0 3 0 0 *linemesh_saveparameters 1 2 0 0 *linemesh_savedata1 1 5 0 0 The parameter "density" in line 3 and 4 are manually assigned, and the "segment" and "density" parameteres must be strictly matched. If the length of each line are different, the density are also different. So, a lot of *linemesh_saveparameters commands are needed. It is not acceptable for this meshing scripting. So, is there a way to mesh lines with constant element size?
  4. Hi, When I tested the example of OS-1393 in HyperWorks 2017, a lot of errors were reported. The settings in this example were followed by the document. I don't know where the problem is. wheels_contact_S2S.fem
  5. In force case, I found that, even though using calculated dependent node with RBE3 element, the concentrated force cannot be distributed equally to all nodes of the truncated model. However, when I use the distributed nodal force directly and planar symmetry constraints, the results are equivalent to those of the whole model. In torque case, I tried to use PERBC bulk data to simulate the cyclic symmetry, but I don't get any satisfied results. Doesn't the RBE3 element located in symmetry plane or center suitable for symmetry constraint s? F_Tq_on_tube_Quarter-PERBC.fem
  6. Hi, tinh How to reduce the whole model and setup cyclic constraints on the quarter model?
  7. Hi, Rahul R The two .fem files are uploaded here: F_Tq_on_tube.fem F_Tq_on_tube_Quarter.fem
  8. Hi, I have a problem with planar symmetry on a tube. One end of this tube is full constrained, the distributed force on the other end is applied by the concentrate force (or torque) on dependent node of RBE3 element. To reduce the model, a quarter of this tube is constructed. For the nodes on symmetry plane (X-plane and Y-plane) except the dependent node of RBE3 element, the (156 and 246)DOFs of these nodes are constrained. The model is shown as follow: (Fz=1000, Tz=2000) However, the results of the two loads are not reasonable and right. I think the reason is the symmetry constraint of RBE3 element is not setup correctly. How to fix it? I attach the results of the whole model (Radius=20, length=200, Thickness=2, Fz=4000, Tz=8000):
  9. Hi, Toan Nguyen If I apply the shape with different multiplier, the obtained intermediate curve is not an arc, actually it is an interpolated curve, just like this: Many thanks. Morph_ArcTangent_shape.hm
  10. Thank you very much @Prakash Pagadala.
  11. Hi, Prakash Pagadala I cannot assign different material orientations to each ply element, although I set the ply angle of the two plies in one coordinate system. Are the material orientations in each ply of composite material's model the same? Many Thanks.
  12. Can anybody give me some advices? Thanks.
  13. Hi, tinh The purpose of this test is to get an shape variable which is able to be used in optimization. Your advised method is based on the pre-establised arc. The constraints of the symmetry and tangency are ensured by creating the new arc manually. I'm looking for a simple and direct method to establish the relationship between the designable shape variable and the radius of this arc. Many thanks.
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