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marta

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Posts posted by marta


  1. Hi @Ivan

    thanks for your replay.

    All file are in the same folder.

    After several attempts where I change the different options about include file (in the attached images you can see the options set) the simulation run.

    image.png.9709e0359e78333061ca07c9578861fe.png   

     

    image.png.6814e1938f2c1114edc4e604a2554fb8.png 

     

    Anyway when I import .sta file it doesn't results in a table but in include file:

    image.png.441dc7a5d19788090d94fb2261956d04.png

     

    Furthermore, despite the simulation runs the component hasn't inital stress.

     

    I don't know where I'm wrong!

    Could you help me?

     

    Thanks a lot!!!!

     

     


  2. Hi,

    I've done a form simulation in Hyperform and I would like to import the .sta file in a new simulation made with radioss block, but when I run the second simulatio an error occours.

    The error is:

    ERROR ID :         1101
    ** INPUT ERROR
    DESCRIPTION :
       CANNOT OPEN INCLUDE FILE
    SOLUTION :
       PLEASE CHECK IF INCLUDE FILE LIES IN THE DIRECTORY

     

    Could someone halp me?

    Thank you in advance

     


  3. Thanks @Rahul R for you replay.

    I've seen the attached file: there b and  are calculate as image.png.5690a927e3d0ac3e2dc9aa13ad4f2664.png but, I have to use CRASURV model, where b and  are calculate as image.png.ec03c505fd29a21eb0f4e024d00909f4.png (I don't know what Wpref is)

     

    Furthermore I don't know HyperStudy, I'm using Hypermesh (Radioss). 

    Any other suggestion?

     

    Thanks a lot

    Kindly regards


  4. Hi everyone,

    I have to simulate an object made by thermoplastic composite laminate. I know that I have to do a model calibration with a fitting of experimental curves but I have a lot of  doubts about the correct procedure.

    For exemple on the one element test I have to define laminate and plys or I have to use a single ply with laminate's thickness?

    Could anyone send me some material about composites model calibration?

    Thanks in advance.

    Marta 


  5. Thanks @Pranav Hari for your replay, but in this tutorial air and water are solid, not sph and if I define different sph for air and water I don't know what type of interface I have to use between the two (I've already try with type7 but it does not work). 

    Have you have some ideas about my problem?

    Thank you! 


  6. Hi everyone,

    could anyone tall my if it is possible to use SPH and material law 51?  

    I have to simulate a bottle filled for 97% with fluid and 0.3% with air and I'd like to use SPH method. 

    Could someone help me?

    Thanks in advance!

    Marta


  7. Hi @Ivan,

    thank you so much for your suggestion! I've try and ereything is working as planned but I've an other problem: when I run the second step this messages appears:

    MESSAGE ID :          259
     ** WARNING ZERO OR NEGATIVE VOLUME : 3D-ELEMENT ID : 483
       ELEMENT IS SWITCHED TO SMALL STRAIN OPTION

     

     **ERROR : TIME STEP LESS OR EQUAL DTMIN FOR SOLID ELEMENTS

     

     **ERROR : NEGATIVE STIFFNESS NODE           1

     

     **ERROR : NEGATIVE STIFFNESS NODE         273

     

    **ERROR : TIME STEP LESS OR EQUAL ZERO

     

    How can I solve this problem?

     

    Thank you a lot!


  8. Hello everybody,

    I have some problems with stress initialization simulation of solid element: I'd like to do a simulation made of two step where the second step shall take into account strain and stress of first step.

    I have try to use \inista but there is something wrong because in second step, at first frame, the part have no stress. 

    The procedure I have used is:

    - STEP I: /IOFLAG 

    - eport solver deck from HyperView for the deformed shape

    - STEP II: /INISTA

     

    In attach the file .rad of simulation.

     

    Thank you in advance for your help!

    Marta

     

    CUBO_stepII_0000.out

    CUBO_stepII_0000.rad

    CUBO_stepII_0001.out

    CUBO_stepII_0001.rad

    CUBO_deformato.rad

    CUBO_stepI_0000.out

    CUBO_stepI_0000.rad

    CUBO_stepI_0000.sty

    CUBO_stepI_0001.out

    CUBO_stepI_0001.rad

    CUBO_stepI_0006.sty


  9. Thanks a lot for your replay, but I have some doubts about this topic.

    I'll try to explain my problem.

    I have to simulate a component made of thermoplastic composite: glass fiber Twill 50/50 fabric, thickness 1 mm composed by two ply.

    Based on material characterization I have to do the curve fitting; consider, for exemple, traction test: I simulated the lab test with Radioss Block, I defined the material using law 25, I defined ply (assigning that material) and laminate. To the sample I have to assign a material and I choose the only one I have. Than, I compared Radoss and test stress-strain curve: the two are too different so I modify E11, E22 and Yield values to obtain a virtual curve similar to the real.

    Is procedure right?  If so, what is the importance of ply and laminate if I assigne the same material to single ply and to whole sample? 

     

    Thanks


  10. 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:

     

    image.thumb.png.7ef447c00b5ad9ccf575e28f5fe53351.png

     

    The problem is in +45°/-45° tensile test because curves are too different:

    image.thumb.png.d1b68f96ba4dd02dc7463ff71e666f6b.png

     

    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.


  11. 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

     image.png.8ca4b26e732b16dff9ef99d7b953b3e6.png


  12. 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

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