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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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  1. Hy, I'm working at composite simulation and I need some help: I have to verify material card data give me by laboratory; with 0°/90° tensile test no problem but with +45°/-45° experimental curve and RADIOSS curve are totally different. I try to eplain my problem better: material constants (by experimental Test) are E11= 20067 MPa, E22=23200 MPa, G12=1519 MPa, G23=1444 MPa and G31= 1444 MPa. I have reproduced experimental test in RADIOSS and I have done card fitting. In 0°/90° tensile test curves were very different but after a little modification of elastic modulus, they fitt enought: The problem is in +45°/-45° tensile test because curves are too different: Radioss curves are made in Hyperview, protting strain and stress of an element. What am I doing wrong? Could someone help me? Thanks in advance.
  2. Pload in optistruct and Radioss

    Hi George, but if I need a function Pressure vs height where pressure is calculate, in accordance with Pascal's Law where ? Is it possible? Thank you! Best regards
  3. Pload in optistruct and Radioss

    Hi George, how can I apply PLOAD4 in Radioss?
  4. SPH formulation - box deformation

    Hi George, thank you very much for your suggestion. A last question: how can I see the particles not like point but big, like in your gif? Thanks
  5. SPH formulation - box deformation

    Hi George, I'm very thankful for your replay! No, I'm actually not looking for a continuos flow; I used the SPH method for meshing water, because I want to see the deformation of a box full of liquid. I think an alternative solution could be to apply a variable pressure inside the box, increasing with depth and applied to different contact surface (see the fig. attach), but I'd like to try the SPC method, if it is possible. So I need that the particles mantain their pitch and employ pressure on box's wall. Any suggestion? Thanks a lot
  6. Hello Everybody, I'm trying to use SPH Method with Radioss. I would like to determinate the deformation of a box full of water. I've modeled SPH Particles of water as simple cubic and I've used interface type 7 between water and box. Loads: lock of the base of box and gravity load to water particles. The simulation run without error but results are different than expected: pressure is not uniformly distributed becuase particles don't mantain the initial pitch. What is the error? In attach the .hm file. Could someone help me, please? Thanks in advance. prova_acqua.hm

    Hi Ashu, thank you for your answer. I know any kind of help but I didn't find it so useful. I'm trying to do non linear geometric analysis using radioss but I'm not sure I'm doing right. I don't understand your 3rd question. Could you explain it? Thanks.

    Hi, I have to simulate a component made by PA66 and it is exposed to a change of temperature and to thermal expansion. I've stress\strain curves temperature dependent and I'm looking for a material law where I can insert this curves. I'm trying to use law74 because I saw it is a material temperature dependent but I don't know what is the meaning of fct_ID_E, or C_E. Can you help me please? Is law74 correct or there is one better? Thanks in advance