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LS-DYNA Examples Blog by Student Qui


Update The blog no longer seems to exist.

I recently came across a nice blog written by QUI. It is remarkable that he is willing to share examples and his experiences in LS-DYNA. The broad spectrum of LS-DYNA applications can never be fully covered by a single blog or a small set of publications. It is great to see such new sites emerging and I hope more users come forward to share their experiences.

Suri Bala

  • Nihar says:

    Hi Suri,

    The address you have mentioned is I think down. Message : The blog does not exist and is available to register

    Thanks
    Nihar

  • Suri Bala says:

    Hi Nihar,

    I have fixed the link. Thanks.

    Suri

  • Jianhui says:

    Hi Suri,

    I am an user of LS-DYNA and I learned a lot from your blog. Now I have a question to request of you. I want to know when the new version of LS-DYNA Keyword Manual will be released, because I am very interested in some material models, such as Mat224, Mat244 and Mat add erosion (item for GISSMO), however the explanation for these models can not be found in current version manual.

    Thanks
    Jianhui

  • Suri Bala says:

    Hi Jianhui,

    LSTC is working hard to release the manual. I would think that by June we should have a beta version released.

    Suri Bala

  • Jianhui says:

    It is really a good news. Thank you Suri!

    Jianhui

  • Mehdi Feizi says:

    Hi dear suri
    I saw your Simple ALE Sloshing Example. and I got it. but I couldnt manage to run it. are you sure it is correct? where is wrong?
    please guide me.
    by the way do U have other similar files which they can help me about sloshing and fluid solid structure?
    best regards

  • abdul says:

    GOOD EVENING SIR

    Abdul nazeer. im new to this site.. i dont know how join it

  • Shobhit says:

    Dear Suri,

    This is with regards to running forming analysis. I want to use the VDA geometry as direct input to ls dyna. Could you please provide me with an example where you have inculded geometry as input.

    Thanks and regards
    Shobhit

  • Suri Bala says:

    @Abdul.

    There is no login necessary to view the blog.

    Thanks
    Suri Bala

  • Hanszy says:

    Dear Suri,

    i’m now try hard to simulate with the MAT_244. There’s still no official release for this material, so a sort of parameters are still unknow for me.

    I want to ask when will the official documentation for this material be released?

    Thx a lot:)

    Hanszy

  • Suri Bala says:

    Hanszy

    I can’t seem to find the documentation for MAT_244 in my latest manual. Can you please give me the name of the material model or any references.

    Thanks,
    Suri Bala

  • Hanszy says:

    Dear Suri,

    thanks very much for your quick reply.

    The material’s name is MAT_UHS_STEEL. It is used for simulation of hot stamping.

    I’ve searched the manual version R5 beta that was released by lstc on May 2010. But there’s no informations about this material in this latest version. I would be very thankful if you could help me:)

    Hanszy

  • Greg says:

    hi,
    what is a address of this blog, I cannot find fixed one ?

    Regards,
    Greg

  • Suri Bala says:

    Greg,

    I apologize since I can’t find the site now. It must have moved or is down.

    Suri Bala

  • mrk says:

    hi
    i can not enter to your blog
    the message,The blog does not exist,is displayed
    thanks

  • Neha says:

    Hi Suri,
    I am working on the ball impact problem. I see lot of oscillations in my output model Other problem is that my plastic strain values are not matching to the experimental data. Does it have something to do with defining specific contact and introducing damping, friction etc….Can you please suggest?

    Thanks,
    Neha

  • simplefan says:

    Hi Suri,

    I am an user of LS-DYNA . Now I have a question to request of you. I want to know I am very interested in Mat244,do you have some information ?please tell me thank U

  • rahul says:

    Dear Suri

    can u please once again upload the LS-DYNA Examples earlier given on Blog by Student Qui

    Rahul

  • Suri Bala says:

    @Rahul,

    The blog has been removed by the author. The link that was provided does not work anymore.

    Suri Bala

  • FEAuser says:

    Hi Suri and others,

    In LS-Dyna, I was using composiste damage model(type22). I used AOPT=2 (I have brick elements), and I wanted the fibers to be at 45 degrees, so I specified the vectors ‘a’ as cos45i + sin45j + ok and ‘d’ as cos(135)i +cos(45)j + ok.

    But my results do not look correct. For one thing, this material with 45 degrees fiber is less stiff compared to 90 degrees fiber.

    Also when I transform the stifness matrix with the transformation matrix such that I get the corresponding, youngs modulus for 45 degress fiber. I run this case with the local material axis (AOPT=0). I would think these results should be the same as the ones I get from AOPT=2, but with vector as specified as above.

    Am I missing something?

    thanks!!

  • Gane says:

    Hi Suri Bala & others,

    I am new user to LS-Dyna. I am trying to predict fall of an automotive sub assembly which is tabbed to a bigger assembly at few locations. Tabbing is essentially a contact between interfacing parts of both the assemblies. The bigger assembly is constrained at few locations. I am only considering self weight the sub assembly & essentially a gravity load is applied. My termination time needs to be a minimum of 2 secs to see if the tabs hold the assemblies together.computational time is an issue since it involves more than 50,00o elements.

    Kindly suggest the best method to predict such a fall phenomenon in reasonable time.

    Regards
    ganesh

  • ashok says:

    Hi suri,

    I want know the option for Include_tranform in ls dyna so pls explain that….
    thanks
    ashok

  • ganesh says:

    hi suri,
    can you please help me understand how does dyna calculate database section force.Also how can we use this force data to evaluate a structures performance in automotive crash or impact.

    Thanks and regards

    Ganesh

    • Suri Bala says:

      Ganesh

      Based on the nodes and elements defined as part of the section, LS-DYNA uses the stresses in those elements to determine the forces.
      These forces are later transformed in a global system or a local system as defined in the section.
      Yes, you can use these forces to understand the forces experienced by the structure components.

      Suri

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