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Found 11 results

  1. Hi, I have a question concerning the Input of true stress vs effective strain curves in ls-dyna: I would like to insert several curves for different strain rates for MAT_24 using the table Option, because I dont know the Cowper-Symonds constants. These curves are from experiments and range from the yield point up to the ultimate tensile stress. The remainder is missing and that is why I have used the voce equation for it. Does it make sense to insert several Points using "Load xy Data" or just up to 8 Points? I plan on crushing a thin walled tube of AA6060. Greetings, Friendly
  2. Hello everyone, I am working on an FE model containing beams that have a square (or rectangular) cross-section. As a first example, I used a beam with a square cross-section. Each side measures 20e-2m. When I export my model in LS-DYNA format, I see that a *SECTION_BEAM keyword is created. I understand well the first parameters from secid to itt, but I can't understand how the j parameter is computed. Using Hypermesh for a square cross-section with a 20e-2m side, I have J=2.25310E-4m^4. However, when I try to find this value again using formulas from the wikipedia page (https://en.wikipedia.org/wiki/Torsion_constant), I can't find the exact same value. Depending on the used formula, I either find J = 2.25000E-4 m^4, J = 2.25600E-4 m^4 or J = 2.25333E-4 m^4. These values are close (especially the last one), but still they're not equal to the one given by Hypermesh. Right now, it might not be seen as a problem, but what if the values become too different if I use other cross-section values? That's why I need to understand what Hypermesh does. I have searched the Hypermesh documentation but I didn't find any information about how this value is computed. And I need it to understand this because I want to run comparisons between commercial solvers and personal codes. Does anyone have a hint about how to find this value? Thank you in advance, Corentin.
  3. AmitKumar

    Export quad8 elements to LS-DYNA

    For LS-DYNA user profile inHypermesh, there is no "quad8" in "elem types". On exporting the mesh, elements are not exported and only the nodes are exported to the .k file. In "HYPERMESH" user profile, "quad8" is blank in 'elem types' and is not mapped to "SHELL" as it should be. Does it mean that Hypermesh doesn't support quad8 mesh?
  4. hiranwale_bharat

    Problem while Exporting to LS-Dyna

    Hello, I have created a mesh file in HM and assigned material and properties to the elements. But when I export the same file, I am not able to see the properties or materials in LS dyna. May I know where am I going wrong? (I have used LS- dyna as profile) Thanks Bharat Hiranwale
  5. I have a model where i have defined cross section planes in a model. It's a LS-Dyna model. I know how to view forces in those planes. But is there a way to calculate shear and normal stresses in those planes? Thanks in advance PS - A method other than dividing the forces by area
  6. Sandesh Gandhi

    Not able to open .k files in hypermesh

    Hi, I have meshed a model in hypermesh and I exported it to Ls-dyna by using .k file. That worked all fine. But as I wanted to make some modifications in the mesh, I am not able to import the k file back into hyperworks. I tried saving for same versions of Ls-dyna from both the ends. It did not help. If I try to import the same file which I just exported from hypermesh, even that file is not being read. The message in the bottom says 'The file being opened for reading does not exist'. Screenshot attached. I have made sure that I am using the correct path of the file I want to open. But this ' file does not exist error' shows up for many cases, even when I try to check element quality or even when I open the hypermesh default screen. Screenshot attached. (2nd)What could be the problem?
  7. Hi all, I'm encountering a problem in a low-velocity impact simulation with a composite plate. As you can see from the image below, at the beginning of the analysis, the impactor literally penetrates the plate but without effective failing of any elements. I experience this problem when I try to simulate the delamination, ply by ply (in my case 16 ply), using very thin shell elements (the thickness of each ply is approximately 0,23 mm). Indeed, after studying the contact problem in LS-DYNA, I figured out that, when very thin shell elements are used, the plate drastically fail when the impactor approaches it. For this reason I had to reduce the SLSFAC from 0.1 to 0.001 in *CONTROL_CONTACT in order to have reasonable results, because the impactor of only 1,5 kg and with an initial velocity of 6,5 m/s destroyed the plate in the very first milliseconds of the simulation without this change. But now, solved one problem (however I'm not really sure about this, maybe someone can explain me better this contact stiffness problem), I have another one I'm using a MAT22 model for the composite and a MAT20 for the impactor (made of steel). To simulate the delamination I chose the *CONTACT_AUTOMATIC_SURFACE_TO_SURFACE_TIEBREAK with 15 delamination model in between, penalty contact SOFT = 0 (justified by the fact each ply is identical) and OPTION = 8 for the failure criteria (I didn't know if PARAM = CCRIT for this option had to be used, so I left it blank). For the contact between impactor and the plate I chose *CONTACT_AUTOMATIC_SURFACE_TO_SURFACE with SOFT = 2 (because of the different materials and meshes), FS=FD=0,5 and with the impactor being the master and all 16 plies being the slaves. Any suggestions to solve this problem? Thanks in advance for any response. impatto.bmp
  8. Shreya Thusoo

    HyperWorks for LS-DYNA

    Hello all, I currently have HyperWorks v14.0 - Student Edition and I want to use HyperWorks for LS-DYNA using the LS-DYNA interface. Is it possible to do so? At present I am only able to use BasicFEA, RADIOSS, OptiStruct and CFD-AcuSolve interfaces, as is seen in the attached file. What do you suggest? Do I have to buy the full version? Thank you in advance.
  9. inderpuar

    Cohesive Element Modelling

    Hello, I been trying to model delamination using cohesive elements on hypermesh for LS-Dyna code. I am unable to model cohesive elements. I downloaded some k files from LS-Dyna support website in which a double cantilever beam test is performed using cohesive elements. However, I have not been able to replicate the cohesive elements in my models. If any one has any experience in cohesive element modelling please tell me how to do this. Thanks
  10. Hello, I am new to Hypergraph. I need help to find the following parameters in Hypergraph 2D: Neck Force (N), Chest Deflection (mm), V*C (Viscous injury response) (mm/s) and Femur Force (N). We tried to plot these results using Nij and V*C tool under Injury pull down menu in Hypergraph 2D, but we are getting warning messages of Reference page is not valid. Could anyone please provide any solution/documents to get these values. Thanks, Suresh.
  11. huijaek

    tet10 mesh in LS-Dyna

    Hi I mesh my geometry with hypermesh and use LS-dyna as a FE solver. When I created tet10 mesh in hypermesh and looked at the element summary, it said " TETRA10 ELEMENTS NOT SUPPORTED in LS-DYNA template. These elements will not be exported." I would like to confirm that if I need to export tet4 mesh and convert them into tet10 in LS-prepost. Does anyone know about the problem? I would appreciate any help. Thanks, Jay
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