hypermesh培训ppt day2.ppt

Creating and Editing Solid Geometry Creating a Hexahedral Mesh using the Solid Map Function Chapter 4: Solids and Hexas Solid Geometry: What is it? A solid is: ? A geometric entity that define a 3-dimensional volume ? Same as solids used in most CAD programs Used in functions where defining a volume is required ? Hexa meshing ( 3D : solid map : volume sub-panel) ? Tetra meshing ( 3D : tetramesh : volume tetra sub-panel) Especially helpful when dividing a part into multiple volumes ? A part can be divided into multiple, connected solids ? The connection between adjacent solids (topology) can maintain the connectivity of mesh ? Aids visualization when dividing a part into simple, mappable regions (used in hexa meshing) Solid Geometry: 3D Topology Example: 2 connected solids in topology display Fixed Points ? Selectable as points ? Lie at the ends of edges Solid faces ? Selectable as surfaces ? Bounding Faces ? Green ? Belong to 1 solid ? Partition Faces ? Yellow ? Shared between connected solids Edges ? Selectable as lines ? Shared Edges ? Green ? Belong to 2 adjacent faces of 1 solid ? Non-manifold Edges ? Yellow ? Belong to: ? A partition face - OR - ? 2 solid faces and 1+ surfaces Solid Geometry: Tools for Creating Solids Import ? Pull-down menus – File > Import > Geometry ? Toolbar > > Geometry ? HyperMesh will import solid geometry from file types that support solid data Solids panel ? Bounding Surfs – Select surfaces that enclose a volume ? Drag –“ Extrude" a cross section along a linear path ? Spin –“ Extrude ” a cross section via a circular path Primitives panel ? Creates solid geometry of basic shapes: ? Square / Block ? Cylinder / Cone ? Sphere ? Torus Solid Geometry: Tools for Editing Solids Surfaces panel ? Creates surfaces using various methods ? Can be used to split a solid ? Edges of the surface must be equivalenced to edges on the solid Solid Edit panel ? Trim with …– splits a solid into 2+ solids using: ? Nodes ?