These questions apply to planar symmetry of solid assemblies (multiple parts) in SW Premium 2015 SP4.0. For sake of argument, suppose I have an assembly (and its loads and restraints) that is symmetrical about two of the the three principal planes. One of the symmetrical quarters is illustrated here:

Question 1: I produced this quarter-solid from a previously designed full solid using an assembly extruded cut. Is there some more automated way to cut an assembly down to one symmetrical fragment, for example simply by referencing the planes of symmetry?

The easiest way to apply symmetry restraints for simulation in the above model seems to be to place a "Fixtures/Advanced Fixtures.../Symmetry" in the study tree and then list the planar surfaces to which symmetry should be applied. I presume that *all six* of the cut faces must be listed, although the yellow preview that I get suggests that a minimum of two (one on each symmetry plane) will do, as illustrated here:

Question 2: Is this preview deceptive in that all six cut faces must indeed be listed?

Question 3: Is there some automated way of checking that the symmetry restraints are valid in that they actually re-constitute the entire body? Is the yellow preview -- specifically the appearance of the fourth quarter opposite the original, in addition to the two quarters across their respective symmetry planes -- sufficient verification?

(I recall that, for cyclic symmetry applications, the approved test was to circular-pattern the segment and verify that the pattern could be merged into a single body. I suppose I might do something like that in this case too, although this is an assembly, not a single part...) -- John Willett

Hi John,

Q1: There is an option in SOLIDWORKS to check the symmetry, in command manager of the Evaluate tab (see the figure below)

Q2: Yes, all six cut faces must be chosen in symmetry selection set of faces. It is a common mistake that as soon as you choose one face the yellow image of symmetry appears, which does not mean the sufficient faces are selected. User needs to be aware and select all faces that are cut through the symmetry plane.

Q3: There is no automated way to check if symmetry is correctly applied. However, user can check it after running simulation. The judgment method is as follows: displacement of the model perpendicular to plane of symmetry (at symmetry plane) has to be zero. This can be checked easily in post-processing stage of results.

By the way, another advanced method to apply symmetry is "Use Reference Geometry" or "On Flat Faces". To see how to also use this method see the the following link: 2013 SOLIDWORKS Help - Symmetry Restraints for Shell Models

Please let me know if it answers your questions.

Thanks,

- Siavash