FEA Applications I MET 415 Review Course Structure: 15 week course Weekly Schedule 50 minute lecture 2.5 hour laboratory 50 minute lecture

Transcription

1 FEA Applications I MET 415 Review Course Structure: 15 week course Weekly Schedule 50 minute lecture 2.5 hour laboratory 50 minute lecture Goal: Obtain feedback from Industry Users on course presentation and content The Mechanical Engineering Technology Students are required to take FEA Applications II (MET 425) 9/6/17, David Johnson P.E. (Thank you) & PAJ 1

2 Lectures Focused on Applications User Manual Construction Required Matrix manipulations are only discussed (no exercises) Weekly quizzes (MC and T/F) 3 Exams (MC, T/F, Practical's) Labs FEA Applications I Review Focused on Applications Worksheet Provided Turn In 1. Table of results comparisons (include the model size, i.e., the number of nodes and elements used in each case). At least three FEA analyses are required; more than three may be needed. Results to list: element type, maximum deflection, Fx, maximum SX stress, mesh error SEPC 2. Hand calculation of stress concentration (Include your reference for the formula, etc.) Make a statement comparing the FEA results to the hand calc. Calculate % difference. 3. Hand calculation of the total elongation of the plate in the direction of loading. Make a statement comparing the FEA results to the hand calc. Calculate % difference. 4. An annotated, color (or gray shades) plot of x-direction stress results, SX, from any ONE of your solutions. 5. An annotated, color (or gray shades) plot of vonmises stress results, SEQV, from any ONE of your solutions. Write a note comparing the maximum normal stress (SX) to the maximum vonmises stress (SEQV) - what makes the max. equivalent stress so similar to the max. normal stress, SX for this problem? Why might they be different (in other problems)? 6. [HINT: How is Mohr's circle used in computing vonmises or equiv. stress?] 9/6/17, David Johnson P.E. (Thank you) & PAJ 2

3 FEA Applications I Review ANSYS Mechanical APDL: 5 weeks #2A: Window Latch Work Planes Boolean Ops Plane Strain Commands (AOVLP) #1: 2D Plate Geometry Construction 1 Mesh control Boundary Conditions Plane Stress Model simplification Post Processing #2B: Concrete Dam Varying Loads Gravity & Mass in ANSYS Plane Strain 9/6/17, David Johnson P.E. (Thank you) & PAJ 3

4 FEA Applications I Review ANSYS Mechanical APDL: 5 weeks (cont) #3B: Brake Drum Geometry modification Angular velocity Axi-symmetric Multiple load steps #3A: Ceramic Magnet Geometry Import Multiple Materials Axi-symmetric #4: Plastic Snap Fit Geometry Import and Modification Large Deformation Contact Wizard 9/6/17, David Johnson P.E. (Thank you) & PAJ 4

5 FEA Applications I Review ANSYS Mechanical APDL: 5 weeks (cont) #4A: Interference Fit Statically Indeterminate Contact Wizard Multiple Materials #4B: Pipe Clamp Symmetry Contact Wizard Multiple Materials 9/6/17, David Johnson P.E. (Thank you) & PAJ 5

6 FEA Applications I Review ANSYS Mechanical Workbench: 10 weeks #5: Plastic Plate SCDM Symmetry Multiple Materials #6A: Lawn Tractor Steering Link Combined Loading Symmetry? 3D Solids Singularities #6B: Triangular Plate Singularities Symmetry? 9/6/17, David Johnson P.E. (Thank you) & PAJ 6

7 FEA Applications I Review ANSYS Mechanical Workbench: 10 weeks (cont) #7B: Machining Vise Contacts Boundary Conditions Contact Behavior Scoping Assemblies Mesh Controls #7A: Pump Assembly Contacts Scoping Assemblies Multiple Materials Contact Behavior Bearing Loads #8A: Allen Wrench Non-linear behavior Boundary Conditions Scoping Mesh Controls 9/6/17, David Johnson P.E. (Thank you) & PAJ 7

8 FEA Applications I Review ANSYS Mechanical Workbench: 10 weeks (cont) #8B: Elastomer Hyper-elastic behavior Boundary Conditions Scoping Mesh Controls #9A: Lawn Tractor Hood 2D Shells SCDM Virtual Topology #9B: Welded Plate 2D Shells Rotated Coordinate Systems Post Processing 9/6/17, David Johnson P.E. (Thank you) & PAJ 8

9 FEA Applications I Review ANSYS Mechanical Workbench: 10 weeks (cont) #11A: Back-hoe Beam Elements Section Properties Joints #10: Punch Die 2D Shells & 3D Solids Large Deformation Contact Behavior Symmetry #11B: Bridge (APDL) Truss Elements Boundary Conditions Varying Sections 9/6/17, David Johnson P.E. (Thank you) & PAJ 9

10 Laboratory Teams will be assigned as shown Lab # Member Teams Below for "A" labs (in class) Student "B" Lab Teams can be chosen by individuals (always document who and who did what) Student to submit electronically for the team 9/6/17, David Johnson P.E. (Thank you) & PAJ 10

11 Lab Best Practices/Lessons Learned # Best Practice/Lesson Learned Benefits /6/17, David Johnson P.E. (Thank you) & PAJ 11

12 Applied FEA ME 467 Review Course Structure: 15 week course Weekly Schedule 50 minute recitation 50 minute lecture 2 hour laboratory Goal: Obtain feedback from Industry Users on course presentation and content The Mechanical Engineering Students are NOT required to take Applied FEA (ME 467). There is not FEA II Course 9/10/17, David Johnson P.E. (Thank you) & PAJ & JMJ 12

13 ME 467 Applied FEA Review Lectures Focused on Applications Matrix manipulations are only discussed (no exercises) more in depth Labs Workbench SCDM Focused on Applications Turn In (due weekly) 1. Results: deflection, stress, mesh error 2. Hand calculation of stress/deflection (Include your reference for the formula, etc.) Make a statement comparing the FEA results to the hand calc. HW: Additional activities, similar to labs Individual assignemnts Due bi-weekly Also: Two exams (in lab, practical) Final Project 9/10/17, David Johnson P.E. (Thank you) & PAJ & JMJ 13

14 ME 467 Applied FEA Review Lab#2: Window Frame Plane Strain BCs Lab #1: 2D Plate Geometry Construction 1 Mesh control Boundary Conditions Plane Stress Model simplification Post Processing HW#1: Concrete Dam Varying Loads Gravity & Mass in ANSYS Plane Strain Hand Calcs Singularities 9/10/17, David Johnson P.E. (Thank you) & PAJ & JMJ 14

15 ME 467 Applied FEA Review HW #2: Brake Drum Angular velocity Axi-symmetric Multiple load steps Lab #3: Lawn Tractor Steering Link Combined Loading Symmetry? 3D Solids Singularities HW #3: Plastic Latch 3D Modeling Tetrahedral (free) meshing Element size control Concentrated Displacement Loading 3D Stress State evaluation 9/10/17, David Johnson P.E. (Thank you) & PAJ & JMJ 15

16 ME 467 Applied FEA Review Lab 3a: SCDM Repair Tools IGES file import and repair of somebody else's sloppy model additional model construction after an IGES geometry import Lab #4: Lawn Tractor Hood 3D Modeling: Shell Elements Introduction to Contact Postprocessing of Shells Mesh Error for non-planer Surfaces 9/10/17, David Johnson P.E. (Thank you) & PAJ & JMJ 16

17 ME 467 Applied FEA Review Lab #5: Pump Assembly Contacts Scoping Assemblies Multiple Materials Contact Behavior Bearing Loads HW#4: Gear Box Combined Shell and Solid Models Model Repair Revising and Adding Contact Pairs Scoping results Lab #6: Backhoe Beam & Link Elements SCDM Beams Boundary Conditions Varying Sections 9/10/17, David Johnson P.E. (Thank you) & PAJ & JMJ 17

18 ME 467 Applied FEA Review HW #5: Bolt Bracket Bolt Preload Load steps (sequenced analysis) Small or Large Deformation? Material Nonlinearity? Iterative, Non-linear analysis options and controls Ramped loading, automatic time stepping, convergence issues Lab #7: Allen Wrench Non-linear behavior Boundary Conditions Scoping Mesh Controls Lab #8: Sheet Metal Fan Modal Analysis by FEA symmetry in dynamic analysis constraints in dynamic analysis animation of mode shapes 9/10/17, David Johnson P.E. (Thank you) & PAJ & JMJ 18

19 ME 467 Applied FEA Review HW #6: Machinery Skid Modal Analysis of Assemblies Using Beams and Shell elements in Workbench Lab #9: Tacoma Narrows Pre-stressed Modal Analysis Harmonic Analysis Mode Superposition Method "frequency" domain vs. "time" domain analysis Lab #10: Thermal Stress Conduction and Convection Steady-state Conditions Convection Film Coefficients Symmetry conditions for heat transfer analyses Mesh error measure in thermal analysis (TEPC) 9/10/17, David Johnson P.E. (Thank you) & PAJ & JMJ 19

20 ME 467 Applied FEA Review HW #7: Heat Sink Heat Transfer Analysis by FEA Conduction Convection Internal Heat Generation Load 2D Model in ANSYS Mechanical Thermal Mesh Error (TEPC) Lab #11: Coffee Cup Heat Transfer Analysis by FEA Conduction, Convection, and Radiation Transient Conditions Symmetry conditions for heat transfer analyses Nonlinear film coefficient data table 9/10/17, David Johnson P.E. (Thank you) & PAJ & JMJ 20