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1、1 Copyright DASSAULT SYSTEMES 2001 FEM Surface Fundamentals CATIA Training Foils Version 5 Release 6 March 2001 FOR-CAT-E-FMS-F-V5R6 2 Copyright DASSAULT SYSTEMES 2001 FEM Surface Prerequisites: Generative Part & Assembly Structural Analysis in CATIAV5 Objectives of the Course In this course you wil
2、l learn to quickly generate a finite element model for surface parts. Targeted audience CATIA V5 Users 0.5 day 3 Copyright DASSAULT SYSTEMES 2001 Table of Contents 1.Introduction to FEM Surface Workbench Presentation 2.Mesh Specification and Creation Global Parameters Set mesh specifications Mesh cr
3、eation 3.Mesh Update and Modification Mesh Update Mesh Modification 4.Mesh Quality Analysis Direct Mesh Quality Visualization Quality Parameters Customization Single Element Quality Analysis Statistic Curves Open Bad Element Searcher Edit an Analysis Report 5.Pre-processing Analysis Capabilities Sta
4、tic Analysis Frequency Analysis Element Thickness 4 Copyright DASSAULT SYSTEMES 2001 FEM Surface In this course, you will see how to quickly generate a finite element model for surface parts. It provides users with automatic detail simplification without modifying the reference geometry. Lesson 1 :
5、Introduction to FEM Surface Lesson 2 : Mesh Specification and Creation Lesson 3 : Mesh Update and Modification Lesson 4 : Mesh Quality Analysis Lesson 5 : Pre-processing Analysis Capabilities 5 Copyright DASSAULT SYSTEMES 2001 Accessing the Workbench In this lesson, you will learn about the FEM Surf
6、ace Analysis Workbench by : Introduction to FEM Surface 6 Copyright DASSAULT SYSTEMES 2001 Surface Meshing CATIA FMS V5R6 Geometry : CATIA-GSD V5 (Generative Shape Design) Geometry: CATIA V4 Skin (*ski) Meshing specification associative with design changes Copy/Paste as Result Introduction to FEM Su
7、rface Component Structural Linear Analysis CATIA GPS/EST V5R6 Assembly Structural Analysis (Linear) CATIA FEM/ELFINI V4 Other FEA Softwares (Durability, Crash, NVH,) 7 Copyright DASSAULT SYSTEMES 2001 Start1-2- 3-Advanced Meshing Tools. A new CATAnalysis document is created. Analysis & Simulation 4-
8、Select an analyse type. Introduction to FEM Surface : Accessing the Workbench 8 Copyright DASSAULT SYSTEMES 2001 Specification Tools toolbar Modification Tools toolbar Quality Analysis toolbar Meshing Methods toolbar Visualization Mode toolbar Introduction to FEM Surface : User Interface - Toolbars
9、9 Copyright DASSAULT SYSTEMES 2001 Specification Tools Remove holes, gaps and faces Add / remove constraints Nodes distributions Set global meshing parameters Run topology initialization Mesh the part Modification Tools Manual topological modifications Nodes distributions Remesh a domain Edit mesh E
10、xit Meshing Methods Surface mesher Export mesh Mesh Offset Quality Analysis Intersection / Interferences Quality analysis Visualization Visualization mode Standard visualization Quality visualization Introduction to FEM Surface : User Interface - Icons 10 Copyright DASSAULT SYSTEMES 2001 Analysis tr
11、ee Associated Part Removed geometry for mesh topology Constrained geometry for mesh topology Pre-Processing Input Introduction to FEM Surface : User Interface - Tree 11 Copyright DASSAULT SYSTEMES 2001 General Process for a FEM Surface Analysis Define global mesh parameters and specifications Mesh c
12、reation Mesh modification Analyse mesh quality Pre-processing Analysis Capabilities Ensure that the part has a material assigned Open FEM Surface Workbench 12 Copyright DASSAULT SYSTEMES 2001 Global parameters Set mesh specifications Mesh creation In this lesson, you will learn how to define meshing
13、 parameters and specifications, and how to create the mesh. Mesh Specification and Creation 13 Copyright DASSAULT SYSTEMES 2001 1Click on the surface Mesher Icon in the Meshing Toolbar 2Select the Geometry to be meshed. Global Parameters panel is displayed Mesh Specification/Creation : Global Parame
14、ters - Access When creating a new surface mesh, the first step is to set values for Global Mesh Parameters. 14 Copyright DASSAULT SYSTEMES 2001 Select the meshing method (frontal triangle or frontal quadrangle) Set global mesh size and maximum sag Activate / unactivate node position optimization alo
15、ng strips Activate / unactivate automatic details simplification Set minimum element size for details simplification Set Global Parameters values A surface Mesh Object is created in the Specification Tree Mesh Specification/Creation : Global Parameters - Basic 15 Copyright DASSAULT SYSTEMES 2001 Set
16、 Global Parameters values - Advanced Click “More” This edge will be constrained if the angle between the two faces is greater or equal to 10 degrees Same process for curves Mesh Specification/Creation : Global Parameters - Advanced 16 Copyright DASSAULT SYSTEMES 2001 An automatic geometric simplific
17、ation is performed according to the “Details Simplification - Minimum Size” value Fillet Elimination1 Fillet replaced by a constrained topological edge for mesh Short Curves Suppression2 Before simplification After simplification Mesh Specification/Creation : Global Parameters - Details Simplificati
18、on 17 Copyright DASSAULT SYSTEMES 2001 The “Specification Tools” toolbar is now available Click OK Free edges are displayed with green color Gaps are displayed with pink color Unspecified edges are displayed with white color Mesh Specification/Creation : Global Parameters - Geometric Elements Visual
19、ization 18 Copyright DASSAULT SYSTEMES 2001 -Remove holes, gaps and faces - Add / remove constraints - Create node distributions - Global parameters - Initialize topology - Mesh Mesh Specifications/Creation : Specifications - Toolbar Presentation 19 Copyright DASSAULT SYSTEMES 2001 1Click on the Rem
20、ove Holes icon in the Specification Tools toolbar 2 Set the Clean Diameter value (all the holes with a diameter smaller than this values will be ignored by the mesh). Removed holes turn from green to blue. Holes and gaps can be automatically or manually removed from the topology definition Mesh Spec
21、ifications/Creation : Specifications - Remove Holes (1) 20 Copyright DASSAULT SYSTEMES 2001 You can manually remove holes by selecting them with the mouse or by clicking on to reach the hole to be processed then by selecting it Manually removed hole Mesh Specifications/Creation : Specifications - Re
22、move Holes (2) 21 Copyright DASSAULT SYSTEMES 2001 You can manually remove gaps and cracks by selecting them with the mouse 1 2 Gap Suppression Crack Suppression Mesh Specifications/Creation : Specifications - Remove Gaps/Crack 22 Copyright DASSAULT SYSTEMES 2001 You can manually remove faces by sel
23、ecting them with the mouse 1 2Face Suppression Click on Faces and select the Face to remove Mesh Specifications/Creation : Specifications - Remove Faces 23 Copyright DASSAULT SYSTEMES 2001 1Click on the Add / Remove constraints icon in the Specification Tools toolbar 2 Selecting an unspecified edge
24、(displayed with white color) will set a constraint on it (its color turns from white to yellow) Mesh Specifications/Creation : Specifications - Add/Remove constraints 3 Selecting an constrained edge (displayed in yellow) will set a “No-constraint” specification on it (its color turns from yellow to
25、blue) 4 Selecting an unconstrained edge (displayed in blue) will set an “Unspecified state” on it (its color turns from blue to white) 24 Copyright DASSAULT SYSTEMES 2001 1 Click on the Create node distributions icon in the “Specification Tools” toolbar 2 Select a geometry to create a node distribut
26、ion (constrained or free edge) 3 Set the node distribution parameters 4 Click OK Mesh Specifications/Creation : Specifications - Node distributions 25 Copyright DASSAULT SYSTEMES 2001 1Click on the Global Parameters icon in the Specification Tools toolbar 2Validate or modify the Global Mesh Paramete
27、rs You can modify Global Parameters during Specification Step Mesh Specifications/Creation : Specifications - Access global parameters 26 Copyright DASSAULT SYSTEMES 2001 1 Click on the “Initialize Topology” icon in the “Specification Tools” toolbar 2 The topology is created according to your specif
28、ications and displayed (free edges with green color and constrained edges in yellow) The mesh will be based on this topology. It allows to create geometry simplifications and mesh specifications without modifying the reference geometry Allow a Pre-Visualization of the topology which will be used for
29、 mesh creation Mesh Specifications/Creation : Specifications - Initialize topology 27 Copyright DASSAULT SYSTEMES 2001 1Click on the Mesh icon in the Specification Tools toolbar Create a mesh according to the global parameters specifications you have defined. 2The mesh is created Ignored geometrical
30、 entities are not taken into account during meshing The Modification Tools toolbar is now available Mesh Specifications/Creation : mesh creation 28 Copyright DASSAULT SYSTEMES 2001 Mesh Update Mesh Modification In this lesson, you will learn how to update and modify a mesh on a single part. Mesh Upd
31、ate and Modification 29 Copyright DASSAULT SYSTEMES 2001 1Double Clicking on the referenced part in the specification tree in order to enter in the part design Workbench. 2 Modify the geometry. 3 Update the geometry. Modified section Mesh Update/Modification : Mesh Update - Design modification While
32、 in your CATAnalysis Document you can perform Design Modifications and then Update your previous mesh. 30 Copyright DASSAULT SYSTEMES 2001 1Double Clicking on the mesh object in the specification tree in order to re-enter in the FEM Surface Workbench. 2 The previous mesh will be deleted, a warning m
33、essage is displayed 3 Recompute the mesh. Note that all your parameters and specifications have been kept. Mesh Update/Modification : Mesh Update 31 Copyright DASSAULT SYSTEMES 2001 - Manual topological modifications - Nodes distributions - Remesh a domain - Edit mesh - Exit Mesh Update/Modification
34、 : Mesh Modification - Toolbar Presentation 32 Copyright DASSAULT SYSTEMES 2001 1 Click on Manual topological modifications icon in the Specification Tools toolbar Split function allows to Add/remove an imposed crossing line only between two vertices With Manual topological modifications function, y
35、ou can add or remove meshing constraints like Edges, Vertices and Split, Collapse or Merge conditions. Edge and Vertex modification functions work exactly the same way as in the specification step : 2 Edge : allow to Add/Remove an edge Vertex : allow to Add/Remove an imposed crossing point 3 Color c
36、ode : Green Vertex : is a member of one edge Yellow Vertex : is a member of two edges Red Vertex : is a member of three edges Mesh Update/Modification : Mesh Modification - Manually (1) 33 Copyright DASSAULT SYSTEMES 2001 4 5 Collapse function allows to merge the two end-points of a constraint into
37、one point Merge function allows to simplify and to merge two lines into one. Mesh Update/Modification : Mesh Modification - Manually (2) 34 Copyright DASSAULT SYSTEMES 2001 1 These modification function works exactly the same way as in the specification step. 2 3 Click on the Create node distributio
38、ns icon in the Specification Tools toolbar 4 Select a geometry to create a node distribution Set the node distribution parameters Recompute the mesh Mesh Update/Modification : Mesh Modification - Node distribution 35 Copyright DASSAULT SYSTEMES 2001 1 Click on the Remesh Domain icon in the Modificat
39、ion Tools toolbar 2 Select a domain (area closed by constrain edges) 3 Set mesh local parameters (method and size) 4 Click OK. The domain is remeshed. Mesh Update/Modification : Mesh Modification - Remesh a domain (1) 36 Copyright DASSAULT SYSTEMES 2001 Mesh Size, Front and Mapped Quads Methods Chan
40、ge Mesh Size from 5 to 2 mm Change method from Front Quads to Mapped Quads Mesh Update/Modification : Mesh Modification - Remesh a domain (2) 37 Copyright DASSAULT SYSTEMES 2001 Bead Quads Method Front Quads Method Bead Quads Method Mesh Update/Modification : Mesh Modification - Remesh a domain (3)
41、38 Copyright DASSAULT SYSTEMES 2001 Edit Mesh allows the user to manually modify the mesh in order to improve its quality 1Click on the Edit Mesh icon in the Modification Tools toolbar -Auto smooth function allows to keep the best mesh quality while moving the neighbouring nodes -Auto combine functi
42、on combines triangles into quadrangles -Auto swap function inverts quadrangle diagonals 2 with the mouse you can move nodes (while following constraints) or split quadrangle elements into triangles. Mesh Update/Modification : Mesh Modification - Edit Mesh 39 Copyright DASSAULT SYSTEMES 2001 Direct m
43、esh quality visualization Quality parameter choice Single element quality analysis Statistic curves Open bad elements searcher Edit an analysis report In this lesson, you will learn how to analyse elements quality and to create a quality analysis report. Mesh Quality Analysis 40 Copyright DASSAULT S
44、YSTEMES 2001 1 Standard visualization mode is activated clicking the icon in the Visualization Mode toolbar. Two visualization modes are available : standard and quality 2Quality visulization mode is activated clicking the icon in the Visualization Mode toolbar. Mesh Quality : Direct Mesh Quality Vi
45、sualization 41 Copyright DASSAULT SYSTEMES 2001 1Click the Quality Analysis icon You can select the quality parameter you want to enforce in your analysis 2Select the parameters in the Quality Analysis panel 3Get informations about parameters definitions and thresholds Mesh Quality : Quality Paramet
46、er Choice 42 Copyright DASSAULT SYSTEMES 2001 1Click the Quality Analysis icon 2Select the Element Analysis icon in the Quality Analysis panel 3Select a mesh element 4Element Analysis is displayed 5Select other elements to display their analysis Mesh Quality : Single Element Quality Analysis 43 Copy
47、right DASSAULT SYSTEMES 2001 1Click the Quality Analysis icon 2Select the Statistic Curves icon in the Quality Analysis panel 3Select a quality parameter 4 Move the mouse on the histogram intervals to get numerical values 5Statistic curves parameters are defined in the Quality Analysis panel Mesh Qu
48、ality : Statistic Curves 44 Copyright DASSAULT SYSTEMES 2001 1Click the Quality Analysis icon 2Click the Open Bad Element Searcher icon Get Single Analyze window Search other bad elements Mesh Quality : Open Bad Element Searcher 45 Copyright DASSAULT SYSTEMES 2001 1Click the Quality Analysis icon 2C
49、lick the Quality Report icon 3 Data are available for : - Quality parameters - Elements types Mesh Quality : Edit an Analysis Report 46 Copyright DASSAULT SYSTEMES 2001 Static Analysis Frequency Analysis Element Thickness In this lesson, you will learn how to perform a pre-processing analysis before performing a static analysis in the context of the main exercise Pre-Processing Analysis Capabilities 47 Copyright DASSAULT SYSTEMES 2001 Once the surface mesh has been defined for the part, a static analysis of the surface mesh is performed exactly the same way as a static an