# How to apply pressure/distribution load on hypermesh?

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

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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.

Kenji likes this

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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.

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On 11/30/2016 at 11:54 PM, Prakash Pagadala said:

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 !!!

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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

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On 8/6/2018 at 9:16 AM, Q.Nguyen-Dai 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

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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.

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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.

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I will check with the author regarding that.

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On 8/7/2018 at 5:28 AM, Staedtlerp said:

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!

Mrt likes this

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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.

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@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

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Prakash Pagadala thank you so much Probably I made a mistake reading and studying the tutorial, but It is better to control to avoid misunderstandings

luck

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