1. Team Wrecked Week 9 Deliverables: Engineering Analysis

2. Energy Experiment h = 3 ft w = 2.5 lb d = 25 ft Weight was dropped from a fixed pivot point like a pendulum Wanted to achieve a distance of 25 ft.

3. Experimental Results

4. Spring-loaded Arm - FBD

5. Shear and Bending Diagrams

6. Powered Arm - FBD

7. Shear and Bending

8. Governing Equations

9. EES Equations

10. Important EES Results Spring constant, k = 129.7 lbf/in. Max spring force = 152.8 lbf Torque required by motor = 229.2 lbf-in. Max beam stress, σ = 24.7 ksi

11. Material Selection Tensile Yield Strengths σ (ksi) Engineering Plastics~ 2.5-17 Wrought Aluminum Alloy~ 5-73 Aluminum Casting Alloy~ 9-30 Copper Alloys~ 10-60 Cast Iron~ 47-120 Stainless Steel~ 40-195 Carbon Steel~ 26-118

12. New Design