CAD for the Fiber Path and Machine Path of Composite Elbows

According to the specific relationship of geometrical elements, several methods are presented to decompose face adjacency attribute graph (FAAG) into smaller sub-graphs. For instance, inner loops, loop across several adjacent faces, etc are used to decompose FAAG. To enhance the speed and stability of further processing subsequent steps involve: sorting sub-graphs; extracting recognizable simple features; reorganizing the remaining sub-graphs according to a set of rules and extracting complex features; validating the final feature model by REM (Remove Faces Component) function of ACIS5.0. Benchmarks from NIST parts library are used to verify the effectiveness of our approach.