Downloaded from https://www.everyspec.com APPENDIX C MIL-STD-31000A C.7.5.6. Intersecting loops (G-FA-IS). Definition: Two or more loops in the same face intersect one another. Intersecting loops may render the face invalid. The integrity of the model topology may be compromised. The criterion is true if the faces are not completely embedded within allowable system tolerances. Effects of condition on CAD data quality: Design and drafting: Faces and solids may become invalid. Various modeling operations may fail. Data exchange: Faces may not trim properly. Models may fail to sew into solids after translation. Finite element analysis: Mesh generation may fail.
Mesh quality may suffer from excessive numbers of elements or distorted elements. Numerically controlled manufacturing: Errors in tool paths may occur. Solid models may not sew properly upon import. Recommended correction: Enlarge the distance between loops. If necessary, remove loops, partition faces, or consolidate edge loops while maintaining the desired model shape. C.7.5.7. Embedded faces (G-FA-EM). Description: A set of completely overlapping faces of any type. The criterion is true if the faces are not completely embedded within allowable threshold value. Effects of condition on CAD data quality: Design and drafting: Errors may occur when selecting faces.
Redundant faces consume excess storage. Data exchange: Solid models may fail to sew after translation. 111