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Generative Assembly Structural Analysis CATIA V5 Training Exercises Copyright DASSAULT SYSTEMES Generative Assembly Structural Analysis Copyright DASSAULT SYSTEMES Version 5 Release 19 September 2008 EDU_CAT_EN_GAS_FX_V5R19 Student Notes: Generative Assembly Structural Analysis Student Notes: Table of Contents Pressure Fitting connection Property Recap Exercise Do it Face Face Connections Property Recap Exercise Do it Yourself Distant Connections Recap Exercise Do it Yourself Analysis Assembly Recap Exercise Analysis Assembly of Airplane Recap Exercise Master Exercise Copyright DASSAULT SYSTEMES Assembly Analysis Presentation Static Analysis on an Assembly (1): Pre-Processing Static Analysis on an Assembly (2): Computation Static Analysis on an Assembly (3): Results Visualization Static Analysis on an Assembly (4): Publishing Report Copyright DASSAULT SYSTEMES 3 4 5 6 8 9 12 13 25 26 29 31 33 35 Generative Assembly Structural Analysis Exercise P2 Exercises marked with this callout will work in P2 configuration only ‘Pressure Fitting’ Connections between Rod and Axis 20 min In this exercise you will perform an analysis of Pressure Fitting Joint. You will use an existing Assembly Constraint to create the Connection Property. You will: Copyright DASSAULT SYSTEMES Define a Pressure Fitting Connection property Define a Clamp Restraint Compute the Analysis and visualize the Von Mises Stress Locally optimize the common mesh elements of the two parts Compare the Results Copyright DASSAULT SYSTEMES Student Notes: Generative Assembly Structural Analysis Do It Yourself… Part used: CATGAS_Pressure_Fitting.CATProduct Define a new Static Analysis Define a Pressure fitting connection between the rod and the shaft Select surface Contact Constraint as support from the Tree Enter overlap = 1e-5 mm Clamp the inner surface of the Rod ‘s hole Compute and visualize Von Mises stress Copyright DASSAULT SYSTEMES Apply Local Refinement Apply Local Mesh Refinement with mesh size = 2 mm to both surfaces in contact as shown. Re-compute, visualize the Von Mises Stress, compare the accuracy. Manage the amplitude modulation for a better visualisation Copyright DASSAULT SYSTEMES Student Notes: Generative Assembly Structural Analysis Exercise P2 ‘Face Face’ Connection Properties Recap Exercise 30 min In this exercise you will apply different Face Face Connection Properties to the foot peg assembly’s part constraints. You will use: Slider Connections Fastened connections Contact connections with springs Copyright DASSAULT SYSTEMES Then you will perform a static analysis on the foot peg assembly Copyright DASSAULT SYSTEMES Student Notes: Generative Assembly Structural Analysis Student Notes: Do It Yourself (1/2) Part used: CATGAS_FootPeg_Recap.CATProduct Create Static Analysis Case Apply slider connection to the pin and the foot peg cylinder Pin Small face Peg Peg mount Apply contact connection between the peg Raised Pad and small face of Page Mount Copyright DASSAULT SYSTEMES Raised pad Apply fastened connections between the Pin base surface and Peg surface touching to Pin base. Copyright DASSAULT SYSTEMES Foot peg cylinder Generative Assembly Structural Analysis Do It Yourself (2/2) Apply the Restraints Apply a clamp on the back surface of the peg mount Apply a surface slider on the cylindrical surface of the foot peg Apply the Loads Apply a distributed load of 3000N along the z axis (facing downwards) to the top surface of the peg. Change Element Type Use parabolic elements (for both parts of the assembly). Check the consistency of the model Copyright DASSAULT SYSTEMES Compute Analysis Observe Von Mises Stress, adjust the colour palette in order to visualize the areas where the assembly is most likely to fail Copyright DASSAULT SYSTEMES Student Notes: Generative Assembly Structural Analysis Exercise Student Notes: P2 Distant Connection Property Recap Exercise 60 min In this exercise you will compute a Tightness Analysis in the case of an under-pressure tank. You will: Copyright DASSAULT SYSTEMES Define Virtual Bolt Tightening Connections and apply a pressure inside the tank Perform a Static Analysis Re-compute Analysis with Adaptivity Copyright DASSAULT SYSTEMES Generative Assembly Structural Analysis Do It Yourself (1/3) Part used: CATGAS_Tank_Assembly_Recap.CATProduct Enter the Generative Structural Analysis workbench Define a Contact Connection Property between the tank and the cover Copyright DASSAULT SYSTEMES Define a Virtual Bolt Tightening Connection Property on each corner, using the coincidence constraints previously defined Define a Tightening Force = 5000N on each bolt Copyright DASSAULT SYSTEMES Student Notes: Generative Assembly Structural Analysis Do It Yourself (2/3) Apply a pressure Apply a pressure = 500Pa on all the internal surfaces Copyright DASSAULT SYSTEMES Fix the tank Clamp the bottom of the tank Copyright DASSAULT SYSTEMES Student Notes: Generative Assembly Structural Analysis Student Notes: Do It Yourself (3/3) Compute the analysis, visualize the displacements Create Precision image and the fourth maximum Local Error extrema Use Global and Local Adaptivity to reduce Local Error Enter Objective Error = 10% for Global Adaptivity and Objective Error = 5% for Local Adaptivity Copyright DASSAULT SYSTEMES Re-compute with Adaptivity and conclude about the Result’s Accuracy for 3 iterations. Use More iterations in case Objective error is not achieved. However it will take more computation time. Copyright DASSAULT SYSTEMES To complete this step you will require EST Product Generative Assembly Structural Analysis Analysis Assembly Recap Exercise This exercise will help you to grasp the concepts of Analysis Assembly Management. Copyright DASSAULT SYSTEMES Analysis Assembly of Airplane Recap Exercise Copyright DASSAULT SYSTEMES Student Notes: Generative Assembly Structural Analysis Analysis Assembly Student Notes: Recap Exercise P2 60 min Copyright DASSAULT SYSTEMES This exercise is composed of four main steps: Attach shape to each part in assembly Create Analysis Connections between components Assign Analysis Connection Property to each Analysis Connection Apply loads and restraints Compute global analysis and view results Copyright DASSAULT SYSTEMES Generative Assembly Structural Analysis Student Notes: Analysis Assembly – Design Intent You will perform analysis assembly of airplane components which includes Fuselage-A, Fuselage-B, wing and Fuselage-C. You will reuse existing part analysis documents for of these components for global analysis. You will be provided with Product document which contains assembly of Fuselage-A, Fuselage-B, wing and Fuselage-C. Copyright DASSAULT SYSTEMES You will attach corresponding Analysis document to each component in product document After attaching documents you will apply analysis connections and connection properties to connect two mesh parts to transfer DOFs. These connection and connection properties will be applied between Fuselage-A and Fuselage-B, Fuselage-B and wing, fuselage-B and Fuselage-C. Finally, you will apply load and restraints and perform global analysis. Copyright DASSAULT SYSTEMES Generative Assembly Structural Analysis Student Notes: Analysis Assembly – Design Process 1 Attach Shape to each component in assembly 2 Create analysis connection and assign connection properties 3 Copyright DASSAULT SYSTEMES Apply loads and restraints 4 Compute Global Analysis and view Results Copyright DASSAULT SYSTEMES Generative Assembly Structural Analysis Do It Yourself (1/9) Load ‘Fuselage-A.CATAnalysis’, ‘Fuselage-B.CATAnalysis’, ‘wing.CATAnalysis’ and ‘Fuselage-C.CATAnalysis’ Saving Files in separate folders save each using CATIA ‘File > Save Management’ on your machine in separate folders for future use. Use ‘Propagate directory’ option to save files linked with analysis files. Close each CATAnalysis file after saving Load AAM.CATProduct and attach shape to Fuselage-A (Fuselage-A.1) part Select saved file Fuselage-A.CATAnalysis Copyright DASSAULT SYSTEMES Attach shape to Fuselage-B (Fuselage-B.1) part Select saved file Fuselage-B.CATAnalysis Copyright DASSAULT SYSTEMES Student Notes: Generative Assembly Structural Analysis Do It Yourself (2/9) Attach shape to Wing (Wing.1) part Select saved file Wing.CATAnalysis Copyright DASSAULT SYSTEMES Attach shape to Fuselage-C (Fuselage-C.1) part Select saved file Fuselage-C.CATAnalysis Switch to ‘Analysis & Simulation’ workbench Select Static Analysis and click OK Save the file as AAM.CATAnalysis Copyright DASSAULT SYSTEMES Student Notes: Generative Assembly Structural Analysis Student Notes: Do It Yourself (3/9) Apply Points to Points Analysis Connection between Fuselage-B and Wing Click on Apply Points to Points Analysis Connection icon Select six vertices on wing in First component as shown Vertices shown in boxes Copyright DASSAULT SYSTEMES Select corresponding four mesh parts for Wing from tree in ‘Mesh Parts’ as shown Copyright DASSAULT SYSTEMES Generative Assembly Structural Analysis Do It Yourself (4/9) Select six points on Fuselage-B in Second component as shown Copyright DASSAULT SYSTEMES Select corresponding ‘Lower_Fuselage’ mesh part for Fuselage-B in ‘Mesh Parts’ as shown Click ‘OK’ to confirm Copyright DASSAULT SYSTEMES Student Notes: Generative Assembly Structural Analysis Do It Yourself (5/9) Apply Nodes to Nodes Connection Property Click on ‘Nodes to Nodes Connection Property’ icon Select ‘Points to Points analysis connection’ as support Select ‘Type’ as ‘Rigid’ Connection Status in Model checker must be ‘OK’ Copyright DASSAULT SYSTEMES Apply General analysis connection between Fuselage-A and Fuselage-B Select ‘Fuselage_A_Connect’ group from Fuselage-A as First component Select ‘Fuselage_B_Connect_front’ group from Fuselage-B as Second component Name this connection as ‘GAC_Fuselage_A_B’ Copyright DASSAULT SYSTEMES Student Notes: