EG1003 LAB 2 OVERVIEW Objective Background Materials Procedure Competition Rules Assignment Closing 1 Figure 1 CableStayed Cantilever Bridge OBJECTIVE Design lightweight boom in Fusion 360 to hold significant load and minimally deflect ID: 1048550
Download Presentation The PPT/PDF document "BOOM CONSTRUCTION COMPETITION (VIRTUAL)" is the property of its rightful owner. Permission is granted to download and print the materials on this web site for personal, non-commercial use only, and to display it on your personal computer provided you do not modify the materials and that you retain all copyright notices contained in the materials. By downloading content from our website, you accept the terms of this agreement.
1. BOOM CONSTRUCTION COMPETITION (VIRTUAL)EG1003 | LAB 2
2. OVERVIEWObjectiveBackgroundMaterialsProcedureCompetition RulesAssignmentClosing1Figure 1: Cable-Stayed (Cantilever) Bridge
3. OBJECTIVEDesign lightweight boom in Fusion 360 to hold significant load and minimally deflectConsider material properties when designing a boomStress and strainTest boom using Fusion 360 SimulationEnter virtual boom into competition to obtain highest design ratio2
4. BACKGROUND INFORMATIONBoom:Lifts and moves heavy objectsObjects much heavier than the boomExamples:Construction cranesCantilever bridgesSwing bridges3Figure 2: Tower Crane Courtesy of Philadelphia Magazine
5. BACKGROUND INFORMATIONStress: external force acting on an object per unit cross-sectional areaStrain: measure of deformation resulting from an applied stress4LoΔLF Cross-Sectional Area of Bar (A)Fixed SupportStress (s) = Strain (e) = F = applied forceA = cross-sectional areaΔL = change in lengthLo = original length
6. BACKGROUND INFORMATION5Strain (e)Stress (s)Fracture StressUTS{P}{E}Stress-strain curveKey points/regionsElastic limitUltimate tensile strength (UTS)Fracture stressElastic region {E}Plastic region {P}Elastic Limit
7. BACKGROUND INFORMATION6Strain (e)Stress (s)Fracture StressUTS{P}{E}Elastic limit – point where the material becomes permanently deformed Ultimate tensile strength (UTS) – greatest amount of stress a material can withstandFracture stress – point where the material failsElastic Limit
8. BACKGROUND INFORMATION7Strain (e)Stress (s)Fracture StressUTS{P}{E}Elastic region {E} – material will return to its original shape when load is removedPlastic region {P} – material will permanently deform even after load is removedElastic Limit
9. BACKGROUND INFORMATIONThe Nervous Student & Pen Cap Example1. Elastic Region – The student applies a force, bending the tip of the pen cap back. When they let go, the tip of the cap returns to its original position.2. Plastic Region – The student twists and bends the tip of the cap. When they let go, the tip of the cap stays slightly twisted and bent.3. UTS – The student bends the cap more. The cap is still in one piece, but certain areas are very weak and are on the verge of breaking.4. Fracture Stress – The student bends the cap one more time. The cap finally breaks into two pieces.81234
10. BACKGROUND INFORMATION9Simulation – computer-based software that models real phenomena and predicts the performance of a designFinite element analysis (FEA) – a simulation method to determine the stresses and deformation that a design undergoesMesh – a subdivision of a part into smaller polygons in order to calculate the static properties at each polygonFigure 3: FEA on Wrench Courtesy of COMSOL Multiphysics
11. MATERIALSA computer with Fusion 360Parts in Fusion 360:2 thick dowels (1.1 cm x 122 cm)2 thin dowels (0.8 cm x 122 cm)6 bamboo skewers (30.5 cm)3D-printed dowel connectorsBoom anchor10
12. Design and simulate a boom to obtain the highest weighted design ratio:Also consider the basic weight ratio: PROCEDURE11
13. PROCEDURE12Figure 4: Setup for Competition
14. PROCEDUREMake an initial sketch of the boom design Use the imported parts in Fusion 360 to construct the boom digitallyEvaluate the length and mass of the virtual boomSimulate a deflection of the boomFind the boom’s reaction forceCalculate the weighted design ratio and basic weight ratio13
15. COMPETITION RULESBoom must be anchored to the white plastic anchorageBoom may not be fixed to anything besides the anchorageBoom must extend at least 1.5 meters horizontally from the edge of the anchorage14
16. ASSIGNMENTOptional bonus individual lab report:Answer discussion questions in manualInclude competition scoresheet resultsInclude images of the boom Due at 11:59 PM the night before Lab 3Team presentation:Address discussion points in manualState rules of the competitionInclude pictures, competition scoresheet, sketchesDue at 11:59 PM the night before the next Recitation15
17. CLOSINGRead the instructions in the manual closely Get a TA to help if having difficulties with Fusion 360Make sure the simulated boom appears as it shouldSubmit all work electronicallyTake screenshots of the boom and simulation16
18. SOFTWARE FOR NEXT LABIn preparation for the next virtual lab, download these software ahead of time:Autodesk Fusion 360Autodesk Revit17
19. QUESTIONS?