Getting Started with Pro-Mechanica
In order to run an analysis you have to model the required geometry using standard pro-engineer module. Save it and follow the path: Applications>Mechanica
You may see a screen like this:
There will be a small dialogue box at the top right corner of the screen named “Model Type”, in this dialogue box we can select the mode of the analysis (like, structural or thermal).
By checking the box near FEM mode you can tell pro-mechanica whether you want to create only the mesh in mechanica or you want to solve also in pro-mechanica.
By clicking the “Advanced “button you can select the sub type of the analysis (For example, you can select either 3D or 2D plane stress or 2D plain strain or 2D Axisymmetric.
In pro-mechanica we can solve either structural or thermal problems. In both the cases the following subtypes of model are possible:
3D: The whole 3D geometry is converted to FEA mesh. The approach is quite simple but it requires more computer resources.
2D Plane stress: In a 3D problem if the loads and displacements are in XY plane and the part is a thin, flat plate kind of model (t<
To solve using this method you have to select the surface which is in XY plane and also the co-ordinate system with respect to which the plane is in XY.
2D plane strain: When in a 3D model the strain developed perpendicular to a certain surface is zero then we can solve the problem by plane strain method. In plane strain problem the structure should substantially long (h>>a, b) and Geometry, loads and displacements should be in XY plane. In case of an assembly all the components should in same Z depth.
Long tube carrying water is an example of plane strain problem.
To solve using this method you have to select the surface which is in XY plane and also the co-ordinate system.
2D Axisymmetric: If by revolving a slice of 2D model to 360 degree around y axis the 3D model is formed and the geometry, loads and displacements of the slice is at positive side XY plane then the problem could be solved by this approach.
Suppose we have a circular plate with a hole at the centre and the plate is under uniform loading at the top surface, and then we can use the 2D section (for analysis) by revolving which we could obtain the plate
The 3d, plane stress, plane strain and axisymmetric problems will be discussed in depth with example in other parts of the tutorial.