P14042: Una -Crutch

1. P14042: Una-Crutch Right Move, Right Place, Right Time Detailed Design Review Ana Allen Joanna Dzionara-Norsen Beverly Liriano Dan Sawicki

2. Agenda

3. Review from Preliminary DDR

4. Pros: • Lightweight • Easy to manufacture • Sliding button connective mechanism • Cons: • Design resembles standard axilla crutch Crutch A Sliding button

5. Pros: • Aesthetically different from standard axilla crutch • Pads tested during user feedback • Cons: • Complicated to connect • Hard to Manufacture Crutch B

6. Notes from Preliminary DDR

7. Notes from Preliminary DDR

8. Review of Final Design

9. Revised Features of Connective Mechanism

10. Bill of Materials

11. Brinkman Lab Parts

12. Bill of Materials

13. Bar Stock

14. Bill of Materials

15. Pins/ Screws/ Buttons

16. Feasibility of Design

17. 2 1 The Six Key Components of the Una-Crutch 5 6 3 4

18. Engineering Requirements

19. Item 1: Shaft

20. Shaft Characteristics

21. 1 Shaft Static FEA • Assume and no friction. • Material: 1060 Al Alloy • YS = 27.6 MPA • Load at Point 1, P=150lb due to E.R. #2. • Constraints: • Fixed at Point 2 • Roller at Point 1 1 2

22. Shaft Von Mises Stresses Max stress < YS, Thus no failure.

23. Shaft Displacement

24. Item 2: Axilla Pad Frame

25. Axilla Pad Frame Characteristics Magnets TBD Analysis to be completed by Gate Review

26. Axilla Pad Frame Static FEA • Assume and no friction. • Material: Nylon 6/10. • YS = 139 MPA • Distributed load of P=300 lb split across surface 1 due to E.R. #2. • Constraints: • Fixed at Holes 2 and 3. 1 2 3

27. Axilla Pad Frame Von Mises Stresses Max stress < YS, Thus no failure.

28. Axilla Pad Frame Displacement

29. Item 3: Adjustment Shaft

30. Adjustment Shaft Frame Characteristics

31. Adjustment Shaft Static FEA 2 1 • Assume and no friction. • Material: Al 1060. • YS = 27 MPA • Distributed load of P=300 lb at hole 1 due to E.R. #2. • Constraints: • Roller at Surface 2. • Fixed at Surface 3. 3

32. Adjustment Shaft Von Mises Stresses Max stress < YS, Thus no failure.

33. Adjustment Shaft Displacement

34. Item 4: Tip

35. Tip Characteristics Note: FEA Analysis neglected for Tip since part rests on Adjustment Shaft

36. Item 5: Handle

37. Handle Characteristics

38. Handle Static FEA • Assume and no friction. • Material: Nylon 6/10. • YS = 139 MPA • Distributed load of P=300 lb along Surface 1 due to E.R. #2. • Constraints: • Fixed at Shaft Surface 2. • Roller at Shaft Surface 3. 2 1 3

39. Handle Von Mises Stresses Max stress < YS, Thus no failure.

40. Handle Displacement

41. Item#6 Base Connection

42. Base Connection Characteristics

43. Base Connection Analyses 3 3a • Material: Nylon 6/10. • YS = 139 MPA • Constraints location 1,1a, and 2 are fixed • Load of 300lb were places locations 3 and 3a 1 1a 2

44. Base Connection Von Mises Stresses Max stress < YS, Thus no failure.

45. Base Connection Displacement

46. Buckling • Components and Materials: • Shafts: Aluminum • Base Connection: Nylon 6/10 • Adjustment Shaft: Aluminum • Assumptions: • Half round cross-section and half round hollow cross-section • Pin-pin • Use Euler formula:

47. Buckling Results • For no buckling to occur, load applied must be less than the critical load • Shafts: • Base Connection: • Adjustment Shaft:

48. Project PlaN

49. Gate Review

50. MSD II Project Plan