Andy Haines, Applications Engineer - Principal Siemens PLM Software

Transcription

1 Efficient Modification of Mesh-Centric Finite Element Models with Femap Simcenter User Connection Tuesday, May 09, 2017/2:30 PM-3:15 PM Andy Haines, Applications Engineer - Principal Brought to you by: Unrestricted #PLMConx

2 Learning Objectives: 1. Examine multiple tools which allow direct modification of the existing mesh 2. Realize benefits of creating geometry from existing mesh when changes to overall topology of the model are necessary 3. Understand value of being able to re-associate an existing mesh to new or existing geometry 4. Recognize efficiency gained by using available Model Merge tool to create a system-level model from other existing models. #PLMConx

3 Using Legacy Models Issue Updating legacy FE models where there is no geometry How Femap helps Refine Existing Mesh using Interactive Methods Split Different Element Types using a Single Command Improve Quality of Existing Elements using the Topology of Those Elements Benefits: Increased productivity, less prone to error Page 3

4 Meshing Mesh, Editing, Element Refine Interactive update of shell/line mesh Auto transition Shrink/grow selection Drag selection Loads/constraints propagated automatically Page 4

5 Meshing Interactive Mesh Refine Example: From an existing Nastran input file imported into Femap, mesh refinement is required in the two areas indicated Page 5

6 Meshing Interactive Mesh Refine Example (continued): At the T junction use Split Edges option Choose Edges Grow Done Page 6

7 Meshing Interactive Mesh Refine Example (continued): At the hole, refine using Split Edges twice Page 7

8 Meshing Interactive Mesh Refine Example (continued): Page 8

9 Meshing Mesh, Editing, Edge Split Mesh, Editing, Edge Split command Options to allow you to select the Number of Splits, as well as, Bias Type, Bias Factor, and location of the Small Elements Helpful to bias existing mesh towards the outside or inside for better results and new elements retain geometric associativity of original mesh Just a reminder, splits all solid, planar, and line elements (linear and parabolic) and meshbased loads and boundary conditions are distributed appropriately Page 9

10 Meshing Mesh, Editing, Edge Split Mesh, Editing, Edge Split command Page 10

11 Meshing Mesh, Editing, Edge Split Mesh, Editing, Edge Split command Edges Between Multiple Nodes option, allows selection of any number of nodes, then determines all possible splits between the selected nodes Number of Splits remains available, but Bias Type must be set to Equal Page 11

12 Meshing Multiple Element Splitting Mesh, Editing, Edge Split command Multiple elements (nodes) can be selected for splitting in a single command More efficient mesh refinement process Page 12

13 Detailed Mesh Editing Additional Element Splitting commands Mesh, Editing, Interactive command Choose a Pattern to update one element at a time For non-symmetric Patterns, moving cursor within an element changes how element is split. Merge option to merge coincident nodes when done splitting elements Mesh, Editing, Split command Choose a Pattern to update any number of selected elements at once How element is split is based on element node orientation Page 13

14 Detailed Mesh Editing Additional Element Splitting commands 1. Mesh, Editing, Split is used to split a region of elements using 1-to-4 pattern 2. Mesh, Editing, Interactive is then used to create properly oriented transition elements 3. Merge option is used in both commands to ensure element connectivity Page 14

15 Detailed Mesh Editing Additional Element Editing commands Mesh, Editing, Rigid Connectivity command Select a Rigid Element (RBE2 and RBE3 only), then click a node not currently used by the element to add that node to the element OR click a node currently used by the element to remove that node from the element Original Element Node 5 Selected Node 5 Removed Node 5 Selected Node 5 Added Page 15

16 Creating Geometry from Mesh Issue Modifying the overall topology of an existing mesh may be difficult without any underlying geometry to modify How Femap helps Create geometry from mesh Modify geometry to perform more advanced operations, then reconnect the newly meshed geometry to the existing mesh. Benefits: Geometry modification tools allow for more complex changes to the model. Page 16

17 Using Legacy Models: Geometry from Mesh Create surface geometry from existing shell meshes when there is no underlying geometry available Easily make model changes to existing meshes Easily remesh existing FE models Model topology maintained Automatic mesh / geometry associativity Original Mesh New Geometry Create Cutout New Mesh Page 17

18 Using Legacy Models: Geometry from Mesh Create or import the FEA input file Page 18

19 Using Legacy Models: Geometry from Mesh Create surfaces from patches of elements using Femap s selection methods Page 19

20 Using Legacy Models: Geometry from Mesh Stitch the surfaces together Page 20

21 Using Legacy Models: Geometry from Mesh Add cutouts, stiffener locations, whatever modifications are required Page 21

22 Using Legacy Models: Geometry from Mesh Re-mesh the geometry to create a new FE model Page 22

23 Creating Geometry from Mesh Issue Recreate a single model containing both geometry and FE data How Femap helps Geometry FEM re-association to facilitate creation of geometry-based contact conditions, loads, and boundary conditions. Benefits: Easier to create contact conditions, loads, and boundary conditions on geometry. Page 23

24 Using Legacy Models: Geometry FEM Re-association 1. Import geometry and FE models 2. Modify, Associativity, Automatic command 3. Geometry / FEM associativity control Search tolerance Remove all previous associativity Attachment option Group option Detailed summary option Page 24

25 Using Legacy Models Issue Creation of a system-level model from component models, which may have been created by multiple organizations, can be a difficult task. How Femap helps Existing component models can be merged into a single system-level model using a number of available options to control renumbering, as well as position different components. Benefits: Reuse of existing components leads to increased productivity. Page 25

26 Using Legacy Models: Model Merge Model Merge Rebuild legacy FE models Reconstruct assemblies or reassemble components Page 26

27 Using Legacy Models: Model Merge When multiple models are open in Femap at the same time Copy entities from one model to another with complete control over inclusion and renumbering of: FE Entity types Geometric Entities Boundary conditions Materials Properties Groups Layers Analysis sets Views Model orientation and transformation control File, Merge can also be used to transfer frequently used Materials, Properties, Layups etc. from existing models to new models Page 27

28 Using Legacy Models: Model Merge Control Source and Target Model Page 28

29 Using Legacy Models: Model Merge Preview of IDs currently in use in both Models Page 29

30 Using Legacy Models: Model Merge Control which Entity Types get copied Page 30

31 Using Legacy Models: Model Merge Control selection of Entity Types to renumber Page 31

32 Using Legacy Models: Model Merge Control and Preview Renumbering Page 32

33 Using Legacy Models: Model Merge Grouping and Transformations Page 33

34 Streamlining Workflows Using Legacy Models: Model Merge Page 34

35 Thank You Your feedback is important. Please fill out the Session Survey in the Mobile App. Locate the session in the app Select Take Survey Andy Haines Brought to you by: #PLMConx