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REACTION FORCE AND MOMENTS

hi

 

I need help to understand the reaction force and moment.

 

I am doing a static analysi of 1 m beam with 1 N applied at the one end and fixed constarn at other end. Then i got 1N reaction force and 1N-M moment at the end which fixed. this reasult is the same as the mathmatic calculation.

 

second, i have done the same analysis using solid element for the same diamention, and got totally different results for force and moment.  i am confused, please help. thanks.

 

Guanqun

 

 

 

 

3 REPLIES

Re: REACTION FORCE AND MOMENTS

For the beam element model, there is a single grid that is constrained, so all reactions are at that grid and match what you expect.

 

For the solid elemnet model, there are 4 grids that are restrained (from the image, it looks like one face of a single brick element). You need to sum the forces and moments to get the resultant reaction force. Note that there are no rotational DOF on solid elements. The moment comes from the force times the distance to the point you are summing about.

Re: REACTION FORCE AND MOMENTS

Hi JimB

 

Thanks for help.

 

you are correct, using identify result to sum the force and it is same with the applied force now, but for the moment, is any way to show the result in NX? or i have to check it by hand calculation?

 

Thanks.

Guanqun

Re: REACTION FORCE AND MOMENTS

The easiest way to be able to recover the total interface loads in this case is to use a rigid element (RBE2). The independent node would be SPCed, and the element would be connected to all of the boundary nodes of the solid elements.