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oguzhan

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About oguzhan

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    Austria
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  1. Hello everyone, In my research I have found, that CROD elements support tension and compression only, whereas CBEAMs allow bending as well. Thats why I am thinking to use CBEAM elements to simulate a pullrod but I am not really sure. My main point is to establish a connection between pullrod-bracket (upper left orange part) and pullrod which is modeled as CBEAM elements, so that the connection is only locked along pullrod (CBEAM elements). Like in picture 3, I used RBE2 and locked dof 1,2,3 (no constraint). Like in picture 2, I used RBE2 (all dofs locked) and additionaly I defined a constraint, that it is only locked DOF 1,2,3. After I run the analysis, I get an error : " ** ERROR # 725 *** An invalid rigid element. This RBE2 has rotational rigid body modes in all three directions. ". Could you give me some suggestions, what is wrong or am I thinking the wrong way? By the way, I also have tried to define a diagonal constraint (along pullrod) directly on the independent point (pic 3) but I failed to assign the local axis system for this case. Thanks in advance, best regards.
  2. As you can see in the last picture, the nodes were selected only from the part, where the SPC is defined (so not all nodes from the assembly) but I also tried to select all of the nodes from the assembly and some other combinations but it doesn't work somehow
  3. I already tried it Farouk but I got a failure that "nodes defining a system cannot be assigned to it.", when I want to establish a set reference. Set displacement works, but I think that the assigning is not successful because after that I tried to define a force in z-direction on the global coordinate system. The force did not show in the local/self created coordinate system, but in the direction of the global coordinate system. In my understanding when the assignment of the local coordinate system is finished, it should use the local coordinate as global coordinate. But maybe it has to do with the failure I get when I set "reference". And i cannot proof if SPC defined in the new coordinate system, because it doesnt show. (To be sure: I chose all nodes of the component, where I defined a SPC, and as system the local coordinate system that I created, was used. )
  4. No problem mate, I did create a local coordinate system and I want to apply an SPC and lock a DOF in z-direction like in the picture.
  5. @Farouk Maaboudallah Thank you mate, what can you say about my first question? " 1. I want to establish a SPC to another direction as the global coordinate system allows me. I thought that I can create new axis direction/local coordinate system and use it like in loads but it is not possible to choose it afterwards. Can you explain me the way to do this? ". Thank you very much, best regards
  6. Hi Farouk, did you see my new message?
  7. Hi Farouk, I have some other questions. I would be very happy for your help! 1. I want to establish a SPC to another direction as the normal coordinate system allows me. I thought that I can create new axis direction and use it like in loads but it is not possible to choose it afterwards. Can you explain me the way to do this? 2. I´m testing the differences between S2S and N2S to be sure which one would be better for my analysis but I didnt really understand which one is better. Do you know how I can decide? (I used a plate (2D with 1 Ply) and a 3D-Solid cylinder, you find it attached) 3. So my last question is the difference between RBE2 and RBE3; on the picture I sent you above, there is a orange part with an "x" on it. I want to define a load on this point. What would be your suggestion? RBE2 or RBE3? It would be really great, if you can explain it to me. Thank you very much! Best regards
  8. Hi Farouk, I unfortunately didn't understand it so well. Can you please explain it to me? As you can see from the picture above, I have 3 parts and I want to make a glue contact between the parts. For the glue, I made a solid component to define the material information (the gray part is the glue). (except the yellow part, the other two are solid) How should I mesh the parts? Does my mesh have to be identical on top of each other? (2d, 3d) Can I only mesh the contact surfaces identically (quad / hexa) and mesh, the rest of the solid part(where no contact arises) Tetra? I need some help/tips to finish my thesis. Thank you in advance! Best regards
  9. Hello, I would like to perform a linear static analysis(stiffness) of a composite wishbone (2D Shell). The forkends and brackets are Aluminium (3D-Solid). The solid elements are glued to the 2d element. For the glue, i made a solid component and imported the assebmly from CATIA (Material information of the glue is available). 1.How can I create the contacts between the parts? 2.Is there a special case between 2d and 3d elements to create a contact 3.Is "TIE" the right contact method? I have got another question regarding diffrent subject: 4. Is there any possibility to change the coordinate system of my assembly in Hypermesh (optistruct)? Thanks in advance, best regards
  10. Thank you very much for your answers! But I am still struggling to import the CATIA Model to HyperMesh (Optistruct), although I am using the licensed version of CATIA V5. (Attached you will find a picture of the failure) Optistruct offers three composite modeling methods e.g. PCOMP, PCOMPG and PCOMPP. So I decided to use the PCOMPP composite modelling method, because it is a ply based method. Do you think it is the correct one? Thanks in advance! Best regards, Oguzhan
  11. Hello everybody, I am inexperienced with this software and generally with the simulation and analysis. I would be very happy to have your help. I would like to perform a linear static analysis (stiffness). The model is a carbon fiber upper arm and i have the following questions: Question 1: When I start HyperMesh Desktop 2019 an application called "User Profile" opens and i have to choose one of them. Do you know which is the correct one to start in my case. (OptiStruct?) Question 2: I have access to connect.altair and altairuniversity. There are some tutorials which explain that you have to import the model into hypermesh but i cant find them. Do you know where they are? Could you give me some tipps for my Project? In this regard, I want to perform the following steps: 1. Import 3D geometry from CATIA to HyperMesh (OptiStruct) 2. Define the geometry 3.Preprocessing of the composite • Modeling of the composite material • Create Laminate Modeling Concept • Design of composites with HyperLaminate • Define load and constraints 4. Perform analysis 5. Post-processing of the results Best regards, Coban
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