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## Simulation Mechanical and Multiphysics

Contributor
Posts: 11
Registered: ‎04-10-2012

# The Total Reaction Force

261 Views, 4 Replies
04-23-2012 10:47 AM

Hello, everyone

I am working on an static linear stress model. I want to know the total reaction force on the boundary condition, this should be a very common engineering problem. However, the instructions from documentations are not straightforward enough for me. Can anyone tell me how to get the total reation force from the boundary condtions to the structure?

Thank you.

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Employee
Posts: 398
Registered: ‎05-06-2010

# Re: The Total Reaction Force

04-23-2012 11:45 AM in reply to: Lonelytown

You need to do a little bit of work to get the total value.

1.) show reaction force in result tab;

2.) select all nodes on the boundary that you are interested in;

3.) inquire results and select "sum" at Summary.

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Contributor
Posts: 11
Registered: ‎04-10-2012

# Re: The Total Reaction Force

04-25-2012 12:49 PM in reply to: Lonelytown

Thank you. I did get the reaction force by doing so. But, still, I failed to get the reaction moment using the same mathod. Is there something I need to do?

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Employee
Posts: 398
Registered: ‎05-06-2010

# Re: The Total Reaction Force

04-25-2012 01:00 PM in reply to: Lonelytown

In one of my previous posts, I explained how reaction moments work in ASIM.

Reaction moments in ASIM are only provided on rotational DOFs, such as beam, shell elements.

If you do want to sum all reaction moments on these rotational DOFS, I'll be surprised if it doesn't work.

Currently, ASIM could not calculate reaction moments from reaction forces by timing them with distances.

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Employee
Posts: 492
Registered: ‎03-25-2010

# Re: The Total Reaction Force

04-25-2012 02:26 PM in reply to: S.LI

So to elaborate on S.Li's suggestion, you need to perform the calculation of the moment about the point or axis of interest: M = r cross F where r and F are vectors. Use the "Save Values" button on the Inquire Results window (shown in earlier post) to output the reaction forces and coordinates of the nodes, import that file into a spreadsheet, and do the above calculation.

The command "Draw > Design > Centroid Creator" in the FEA Editor will help you find the centroid of a surface, in case that is where you want the moment.

Sincerely,
John Holtz, P.E.
Senior User Experience Designer, Simulation
Autodesk, Inc.

Current version of Mechanical & Multiphysics: 2013 SP1 (2013.01.00.0012 28-Jun-2012)
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