Dear all,
I am trying to use analytical mapped field in Abaqus to apply loading that I have calculated in a 3rd party software to nodes of my Abaqus model.
My problem is that instead of applying the loads that I have defined to the points that the load is corresponding from the analytical field, Abaqus is distributing the loading across the entire model, and also it creates even more points that i have defined in the analytical field.
I have tried using pressure and traction functions of Abauqs, but both ask me to select a surface.I am using a 3rd party model for my project, so I don`t have a part in the model tree. Just a mesh.
When I select the entire surface of my model, it does what I have described previously.
Also I need all of my force to be aliened to the global coordinate system, and not be perpendicular to the faces of each element. (what Abaqus is doing now, even though that I have selected the global coordinate system in the menu when defining the mapped field.
I think that when I select the entire model, Abaqus neglects the location of each load (that I have defined in the mapped field) and distributes them over the selected area.
In my case, I have 8000 loads, if I have to define a surface for each one it defeats the purpose of using a mapped field.
I am attaching a picture where I am showing how I have defined my mapped analytical field. In it my Z coordinate changes just 3 times. So basically all my loads should be applied to 3 cross section, and not the entire model.
Thank you very much for your time!
Kind regards, Ivan.
P.S. I am using Abaqus 6,14
Although I am not 100% sure what you are trying to achieve, based on my guesses I can offer some hints:
1) The mapped analytical field does exactly what it says, it maps values to all your nodes, eg. it interpolates the value on the nodes from the surrounding values where you haven't defined a value. There are some options in the "mapper controls" tab to play with the interpolation if you wish to.
2) The pressure is always normal to the surface by definition. Traction is defined in the local 1,2 coordinate system (which is a projection of the coordinate system you are using). By the way you can easily select surfaces on an orphan mesh as well from the element surfaces.
So the question is what would you like to achieve? If you want to map 8000 discrete forces, then you need to ensure that there are the appropriate number of nodes (at the right position) to map to, otherwise the sum of all the applied loads will be different to what you tried to map. This might be difficult if you use a different mesh than where you calculated the forces.
Also, you might want to ask yourself, what would physically happen at the nodes where you don't apply a discrete force? Are you designing something like a pin cushion or a structure held in place with a fixed number of bolts, or something that is under loads from a fluid or similar? I would imagine it is the latter. In that case, what I would recommend is to resolve your discrete loads into pressure and traction components, then apply that to the mesh using analytical fields, as then your element size and number/position of nodes doesn't matter anymore. Since your model looks like a cylinder this would be fairly easy, just transform your loads from the global cartesian coordinates into a cylindrical coordinate system. Then the radial load is the pressure, and the other 2 are the 2 tractions.
Hope you find something useful in this answer!
It is necessary to have a node at that point in order to enter a centralized load.The best way is to create a node by using the appropriate partition at that point and apply the load to that point.
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