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    • Rahul Ponginan

      Please click here for a short but important announcement   03/26/17

      Dear Users Our Commercial and Academic users around the world can use these same forums here as before i.e. the Altair Support Forum , Commercial users from India with solver queries can go to the Solver Forum for India Commercial Users , Academic Users from India and AOC India Participants are requested to go to the Forum for India Academic Users and AOC India Participants , We will be tending to all queries in all the forums promptly as before, thank you for your understanding. 

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Found 345 results

  1. Dear all, i have created an assembly with Shell Mesh. I have two questions 1. when I add thickness to a component, the sections where it has a sharp edge like L joint, the elements are getting Intersected. Can this intersection be neglected? 2. In my assembly there are particular locations where I have to connect one components nodes to other components nodes. Since these components have a shell mesh, when the thickness added, the added elements thickness gets penetrated. Are these allowed. Please give your suggestions
  2. bugg in hm graphic area

    hi everyone, i have bugg in hypermesh i can not view discrete element in my part . i add temp node to showing how to rectify that one give thanks
  3. Two bodies are connected by means of bearing (upper race and lower race bolted to respective bodies). Detailed analysis (ignore bearing model) is not required. What type of connections could be given between two components? Can we assume a block instead of bearing, and give respective connections?
  4. Hi, I have a meshed cylinder (2d) on which i want to give an option to select a node to user. Once the node is selected, and clicked on proceed button it should display all the circumferential grids having a user defined number to the grids. Let's say i select a grid having ID as 122. Now, i want to display all the circumferential grid starting from 123 on the same station location where user has picked the node. I want to do it using TCL/ TK. Thanks
  5. Hello everybody, I want to perform an explicit analysis in radioss. I have read that we follow a time step of 1E-06 sec for steel with minimum element size of 5 mm. In my case the element size goes up to 1 mm. I have gone through the book "Crash Analysis with Radioss", according to which we have to look for two formulae to calculate the time step- one is elemental time step and the other is nodal time step. With an approximate sound speed of 5000 m/s through steel, I calculated the time step of 2E-07 sec [i.e., 1 mm / 5000 m per sec]. But I am not able to figure out how to calculate the nodal time step? Would somebody help me out with this? My question is - how much smaller time step would I require to take (for steel) in this case? [Please suggest me an optimum- rough estimate for the element size of 1 mm for steel by taking into consideration the nodal time step also].
  6. Hello! We have the following problem by using OSSmooth for a FEA reanalysis: Our component is made up of a core (blue) and a shell (red/orange). The core has Hex 8 3D-Elements with the Card Image MAT 1 and PSolid. In order to create a shell around the core of the component, we used the tool "Find Faces". Thus we got a shell around the core with Quad 4 2D-Elements. We used the Card Image MAT8 and PShell with an offset to the outside T=2mm. Therefore there should be no intersection between the two kinds of elements (see figure 1). Both the core and the shell was defined as design space so that we optimized them both in a successful optimization. See figure 2: Holes and notches were created in the shell as well as in the core. Afterwards, we tried to import the optimized geometry with OSSmotth by using the following settings: FEA Reanalysis, iso surface, remesh, trias as mesh type and two layers attached. As a result the 3D-Elements has been updated according to the optimization result, but not the shell (see figure 3). Furthermore we got a very questionably visualization of the shell elements: At the attachment points between core and shell, the shell elements strangely stick to the outside and inside (see figure 4 and 5). Are there any mistakes in our settings or in the modelling? Thank you very much in advance for your tips and advices! Greetings Martin
  7. Is Shell elements are appropriate for stress analysis of assembly?
  8. Hi, I did shell mesh by extracting the elements from Tet mesh. Technically they should be connected, just for ex: a cover(shell mesh) on a solid part(Tet mesh). So here I did not extract any mid surface. How should I add thickness here? I am sure mid surface thickness is not going to work. I tried with Mid-mesh thickness as well, it di not work. Could anyone please suggest
  9. DEAR ALL, Now i am using SIMLAB 14.3. upgraded from 14.0. in SIMLAB 14.0 version, i can change the mouse settings by [ Edit--> preference--> system--> mouse settings--> hypermesh] BUT in SIMLAB 14.3 Version, i cant find the EDIT OPTION. so i dont know how to change the mouse setting. i want to use hypermesh mouse settings in SIMLAB. which is convenient for me. so could anyone please help me to solve this.? thanks in advance. best regards. Guru
  10. Books on Altair Products

    Hello Eveybody Regarding to the fact that hypermesh is the strongest mesh software in the world, I wonder why nobody has written a book on it, and we simply have a "do this do that" manual of the software without disucssing it in dept
  11. Hypermesh FAtigue Analysis

    Hello All, I am starting to analysis of the component, Please share the procedure of the fatigue analysis of any component, and also can we find the life of the component based on its fatigue analysis? Thanks
  12. Calculation of area

    I wanted to apply a load on a surface for which I want to calculate the surface area so that I can apply a pressure load on the surface instead of concentrated load ? Is pressure load applied is evenly distributed on the on surface or it is mesh or node dependent?
  13. Hi All, i am new user of Hypermesh and started with meshing the simple geometries. I am trying to create a model in Hypermesh(I don't want to use any CAD software, but only in Hypermesh) since I do not have any CAD geometry of the component. The component looks something like the attached ones and it is a surface, just like a plastic hand cover with two holes. Could some one suggest, if it is possible to model the component in Hypermesh and then mesh it? Thanks in Advance
  14. Any reason for the error in the bottom right that says "the file being opened for reading does not exist"? I've ran the files before successfully, until recently i've gotten this error, which leads to a blank viewer. Any help please. pent.shell.100.xdir.hm
  15. MIdsurface extension

    I have 2 parts forming t section whose midsurface is extracted which creates gap between the parts,to overcome the same i extended the one surface and projected on other , after meshing nodes gets merged is their any need to define contact between the parts as i want to fix these parts ?
  16. I'm trying to apply pressure loads on an aircraft wing. I've created a .csv file for the same . the first column of the file represents the wing chord, second column represents the wing span and the third represents the pressure magnitude(figure attached). When I apply this load on the wing, the pressure is not applied normal to the elements (figure attached). I've checked the element normals and they all point outward. I'm not able to figure out why the pressure is not being applied in the normal direction. Please suggest solutions. Thanks.
  17. How to perform Defeaturing on solid components ? any suggested videos or materials ?
  18. Crashbox Tutorial

    Dear George Sir, Thank you for the crash analysis part to do. I have tried this 3 wheeler motorbike crash box analysis. after the run when i did post process the box pass through the wall instead of hitting. i don't know what is the reason. I am attaching the file. please check and let me know the correction. Best regards, Dani crash_box_meshed.h3d crash_box_meshed_0000.rad
  19. HyperView H3D Options

    Hi, I am trying to export H3D files from HyperMesh (2017.1) and would like to set specific options I am currently struggling with. What I would like to do is to export the components of my db with the different properties coloured. However, even if I have my HM session with the view set "by Prop", when exporting the FE in H3D, the colours are set by component (one single colour by component then). I would like to know whether it is possible to have the colours of the each and every property directly in the H3D file? The aim is to export these components using tcl commands. I currently do it using the folllowing commands which does not give the expected result (properties coloured) : *createstringarray 4 "model=1" "overwrite=1" "title=0" "result=0" *writeh3dwithoptions "$output_dir/H3D/$component.h3d" 1 4 Another point is about the Model Info. Is it possible, using tcl commands, to export an H3D file without model info or changing what is being written at its place? Thank you in advance, Olivier
  20. Hi all, How to define a subset by using hypermesh? I cannot find the method. Thank you. Roy
  21. Hello, Good Morning everyone I want to use the equivalent of following command in my hyoerview script. I tried using as it is but it is giving error. hm_getint, hm_getfloat & hm_getstring I just want input from user, rights now runing with gets command and requesting from command prompt. I want to make it more user friendly. Thank you
  22. RADIATION and time scaling

    Hello, i have a little question about the possibility of time scaling and the use of the radiation load collector. I used the factor 10 (1sec in simulation=10sec in real time) to speed up my thermal analysis with radioss. It works fine wenn i scale thermal conductivity and the heat transfer coefficent (for example convection) by the factor i used for speed up (10). Is this although possible for the radiation? Because i don't see any way to scale this value in correct way... With best regards Kintsch
  23. hai, I am doing a tutorial taken from the Altair site which is a bird strike on aircraft wing. while i am doing i had a doubt regarding the boundary condition application. i don't know how to apply boundary condition in radioss. please help
  24. Element formulation

    I have a component meshed with different elements (Hexa, Penta and tetra). The problem I am facing is while defining the element formulation of the component. How one can define element formulation in such case? The problem is the same for the case of 2D plates when we encounter quad and tri elements in a component. I also searched the answer for this in the book "Practical aspects of FEA" but couldn't find it. Please guide me through the problem.
  25. is it possible to join 3d mesh with spot weld joint? and how to connect a 2d mesh to a 3d mesh?