How to find HourGlass and deal with

Altair Forum User
Altair Forum User
Altair Employee
edited October 2020 in Community Q&A

How to find it and deal with it ?

Tagged:

Answers

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited August 2017

    Hi,

    You can check the hourglass energy in the time history (T01) file. If the user create an output block for each part then it is possible to find which part is contributing for hourglass energy.Also, you can check for hourglass energy with /ANIM/ELEM/HOURG keyword in engine file.

    As explained in the above post, hourglass modes are present only in  under-integrated elements. For shell elements, keep N=5 and for solids use Isolid=14,which is fully integrated element.

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited August 2017

    ok so we have to get this plot but how?

    <?xml version="1.0" encoding="UTF-8"?>hourglass.jpg

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited August 2017

    Hi,

    For global energy plot you will get hourglass energy in Y request and the same can be plotted in HyperGraph.

    You can also go through this tutorial http://www.altairuniversity.com/wp-content/uploads/2016/11/Crash_Box_1.pdf where these options are shown.

    <?xml version="1.0" encoding="UTF-8"?>HG.PNG

  • pohan
    pohan Altair Community Member
    edited August 2017
    Altair Forum User said:

    Hi,

    For global energy plot you will get hourglass energy in Y request and the same can be plotted in HyperGraph.

    You can also go through this tutorial http://www.altairuniversity.com/wp-content/uploads/2016/11/Crash_Box_1.pdf where these options are shown.

    <?xml version="1.0" encoding="UTF-8"?>HG.PNG

    Hi George.

    Where can I find the documents like yours? I searched on the HW help but I did not find anything.

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited August 2017

    Hi Pohan,

    The image above attached is from a model file. 

    But you can get enough data on these technical topics on our RADIOSS ebook, Crash Analysis With RADIOSS – A Study Guide . Please download the same and refer.

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited January 2018

    Hi George,

     

    How to create an output block for each part  to find which part is contributing for hourglass energy?

     

    Thanks.

     

    Regards,

    Kin Poh

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited January 2018

    Hi Kin Poh,

    From Analysis page, create output block for each part. And finally after the run plot the hourglass energy in HyperGraph using the T01 file generated.

     

    Please go through this video series below which is a webinar on RADIOSS and Chapter 6 covers creating output block in RADIOSS.

    https://www.youtube.com/watch?v=1BnhOzRVkEQ&index=6&t=3s&list=PLQ7KUGFuVz4u5y3SvIEIU07427-gATaG6

     

    If you still have doubts please let us know so that we can create a short video on the same.

Categories