How to apply pressure/distribution load on hypermesh?

Altair Forum User
Altair Forum User
Altair Employee
edited February 2022 in Community Q&A

How to evenly apply a 100N force on a 50mm square surface as a pressure on hypermesh??

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Answers

  • gopal_rathore
    gopal_rathore Altair Community Member
    edited December 2016

    Hi,

    Go to BC's tab in optistruct user interface, then create pressure. Here you can enter the pressure magnitude, select the nodes of face on which pressure has to be applied. Keep load type as PLOAD 4.

  • Staedtlerp
    Staedtlerp Altair Community Member
    edited August 2018

    Hi Prakash,

     

    I have a question.

    Considering I have 100Kg applied on a surface of 1m^2. I have a pressure of 100 kg/m^2=981N/m^2=9,81*10^-4 MPa.

    The total number of elements is 200 so each one is 5mm^2.

     

    Why have I to divide the total pressure by the total number of elements??

     

    To obtain the pressure on each element I guess I have to multiply the pressure (9,81*10^4 MPa) to the area of each element.

     

    Or not? Sorry I'm quite confused, I don't understand why I have to divide the pressure by the total number of elements.

     

     

    thank you.

  • Q.Nguyen-Dai
    Q.Nguyen-Dai Altair Community Member
    edited August 2018
    Altair Forum User said:

    @Kenji

     

    First calculate the pressure you want to apply (P= Force/ Area) 

     

    Then select the plates and get the number of elements in that area, Say total number of elements is N in your plate.

     

    Divide the Pressure per element (P/N). This is the pressure applied on each element.

     

    Go to Pressure panel>> Enter the value (which is P/N) and provide the direction.

     

    Hi, Prakash Pagadala: are you sure on you write ? I think it's WRONG to divide the calculated pressure per elements number !!!

     

    Please check & correct it!!!

  • Staedtlerp
    Staedtlerp Altair Community Member
    edited August 2018

    @Q.Nguyen-Dai

  • Staedtlerp
    Staedtlerp Altair Community Member
    edited August 2018

    Sorry I couldn't be able to delete the tag...so, how is it the correct way to calculate pressure on each element?

     

    Thank you

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited August 2018
    Altair Forum User said:

    Hi, Prakash Pagadala: are you sure on you write ? I think it's WRONG to divide the calculated pressure per elements number !!!

     

    Not sure in what context I replied that. I have noted that I included P/N... I have removed the reply to avoid confusion and I will post after going through it again

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited August 2018

    Hi @Staedtlerp Sorry for the confusion,  

     

    I miscalculated. the pressure on the element face is distributed to the corner nodes (using shape function)

     

    anyways, It shouldn't be divided by the element number. to make it easy, you can select the surface on which you want to apply the pressure. 

     

  • Staedtlerp
    Staedtlerp Altair Community Member
    edited August 2018

    Prakash Pagadala

    Thank you very much. I think I'll do in this way, selecting the surface at which elements are associated.
    But I have a question: on the tutorial 'Composite optimization of a skateboard with Optistruct', pag. 13, how are calculated pressures? It seems that the pressure is divided by the total number of elements.

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited August 2018

    @Staedtlerp

     

    I will check with the author regarding that.

     

  • Q.Nguyen-Dai
    Q.Nguyen-Dai Altair Community Member
    edited August 2018
    Altair Forum User said:

    Prakash Pagadala

    Thank you very much. I think I'll do in this way, selecting the surface at which elements are associated.
    But I have a question: on the tutorial 'Composite optimization of a skateboard with Optistruct', pag. 13, how are calculated pressures? It seems that the pressure is divided by the total number of elements.

     

    NEVER!

     

  • Q.Nguyen-Dai
    Q.Nguyen-Dai Altair Community Member
    edited August 2018

    Prakash Pagadala, @Staedtlerp

    <?xml version="1.0" encoding="UTF-8"?>pressure.thumb.png.8eb406b784fdfabe8308494b5dfcaddc.png

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited August 2018

    @Q.Nguyen-Dai

     

    Agree.. I corrected my statement. it shouldn't be divided. I am still not clear what P/N was in my previous reply. Anyways. theoretically, the pressure is distributed to the nodes on the element face. Based on this one can conclude. 

  • Staedtlerp
    Staedtlerp Altair Community Member
    edited August 2018

    @Q.Nguyen-Dai  perfect and clear! thank you so much. I guess it could be a mistake in the tutorial that I mentioned.

     

    Thank you very much:D/emoticons/default_biggrin.png' srcset='/emoticons/biggrin@2x.png 2x' title=':D' width='20' />

  • Staedtlerp
    Staedtlerp Altair Community Member
    edited August 2018

    Prakash Pagadala thank you so much:D/emoticons/default_biggrin.png' srcset='/emoticons/biggrin@2x.png 2x' title=':D' width='20'> Probably I made a mistake reading and studying the tutorial, but It is better to control to avoid misunderstandings:D/emoticons/default_biggrin.png' srcset='/emoticons/biggrin@2x.png 2x' title=':D' width='20'>

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited August 2018

    @Staedtlerp

     

    :)/emoticons/default_smile.png' srcset='/emoticons/smile@2x.png 2x' title=':)' width='20'> luck

  • Rishi Gangwar_22315
    Rishi Gangwar_22315 New Altair Community Member
    edited February 2022

    Found a neat trick to apply Bearing pressure on any bearing seat faces.

    1. Export the solver deck as FEM file to new folder

    2. import the Solver deck in Simlab.

    3. Create a solution on static.

    4. in forces option we find the bearing pressure dialog.(Select the faces and define the X and Y components of the forces in the dialogue.)

    5. Re export the file as FEM and import in HM.

    Please find an easier way to do this and comment. Didn't find an easier way to do this.

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