Ceiling-mounted bicycle lift structural analysis

E = 202,700 N/mm²
Yield strength = 220 Mpa

Loads
P/2 = 111.2 N
P/4 = 55.6 N

(P = 50 lbs)

Distance between support forces: 200 mm
Vertical centroid: -7.57 mm (measure from top surface)
Second moment of area about centroidal axis: 3510 mm⁴
Maximum bending moment: 5,560 N*mm²

Maximum x-bending stress: 9.47 N/mm² = 9.47 Mpa

Distance between support forces: 70 mm
Vertical centroid: -.66 mm (measure from top surface)
Second moment of area about centroidal axis: 37.8 mm⁴
Maximum bending moment: 1,946 N*mm²

Maximum z-bending stress: 3.4 N/mm² = 3.4 Mpa

Maximum net bending stress: 10.1 Mpa

E = 202,700 N/mm²
Yield strength = 220 Mpa

Loads
P/2 = 111.2 N
P/4 = 55.6 N

(P = 50 lbs)

Distance between support forces: 20 mm
Vertical centroid: -.66 mm (measure from top surface)
Second moment of area about centroidal axis: 3.03 mm⁴
Maximum bending moment: 556 N*mm²

Maximum x-bending stress: 12.1 N/mm² = 12.1 Mpa

h = 1.22 mm (sheet thickness)
w = 48 mm (section width)
d = 6 mm (hole size)

d/w = .13 d/h = 5
K = 1.7 - From table A-15-12 of (Shigley, Mechanical Engineering Design)

Actual Maximum Stress = 20.6 Mpa
Safety Factor = 10.7 Mpa

E = 3,500 N/mm²
v = .4 Yield strength = 103 Mpa

Loads
P/2 = 111.2 N
Ft = force resulting from tension in rope
(P = 50 lbs)

Diameter 1: 5.3 mm
Diameter 2: 4.9 mm
Contact length = 13.5mm
Half-width of contact surface = 2 mm

Maximum Compressive Stress = 4.2 Mpa
Safety Factor = 24.5