Downloaded from https://www.everyspec.com APPENDIX C MIL-STD-31000A C.7.4.4. Self-intersecting loop (G-LO-IS). Definition: An edge loop intersects itself at one or more locations. Self-intersections may be caused by errors in creating offset entities. Criterion is true if edge loops do not intersect themselves. Effects of condition on CAD data quality: Design and drafting: Errors may occur when projecting cross-sections of offset entities. Solid features may fail unexpectedly. Data exchange: May cause trimming problems with faces. Finite element analysis: Automatic mesh generation may fail. Excessively fine local mesh may be generated. Numerically controlled manufacturing:
Gouging and other unsatisfactory cuts may occur. Recommended correction: Recreate the offset edge loop in a way that does not produce a self- intersection. Trim the self-intersecting portion of the curve. C.7.4.5. Sharp Edge Angle (G-LO-SA). Definition: Segments in an edge loop meet at angles below the recommended minimum. Effects of condition on CAD data quality: Design and drafting: Sharp edges are generally undesirable in products, with the exception of cutting tools or weapons. Sharp edges are prone to breakage. Sharp notches may promote cracking or fatigue failure. Data exchange: No problems with data exchange. Finite element analysis: Excessively fine local mesh may be generated. 106