Week 1 Spur Gear Challenge

Objective 1:

Case 1: Cast Iron

Equivalent Stress : 393.16 MPa

Total deformation: 30 mm

Stress intensity : 419.02 MPa

Location for a possible fracture is on the left side spur gear bottom of the teeth where the maximum stress is higher than the tensile ultimate strength of the cast iron material - 141.4 MPa

Case 2: Cast Steel

Equivalent Stress : 385.28 MPa

Total deformation: 30 mm

Stress intensity : 425.89 MPa

There is no location for a possible fracture in this case as the maximum stress on the left side spur gear is lesser than the tensile ultimate strength of the cast steel material - 460 MPa

Case 3: Cast Bronze

Equivalent Stress : 389.88 MPa

Total deformation: 30 mm

Stress intensity : 422.42 MPa

There is no location for a possible fracture in this case as the maximum stress on the left side spur gear is lesser than the tensile ultimate strength of cast bronze material - 574.5 MPa

Objective 2:

1. The maximum equivalent stress on

cast iron spur gear is 393.16 MPa which is higher than its tensile ultimate strength

cast steel spur gear is 385.28 MPa which is lesser than its tensile ultimate strength

cast bronze spur gear is 389.88 MPa which is lesser than its tensile ultimate strength

2. The total deformation for the cast iron, cast steel and cast bronze spur gears are 30mm

3. The maximum equivalent elastic strain on

cast iron spur gear is 0.0062034

cast steel spur gear is 0.003215

cast bronze spur gear is 0.00519

Conclusion:

Based on the results,

I recommend the cast steel material as it has better tensile ultimate strength and moreover it has more stiffness than the cast bronze material.

the cast iron material is prone to fracture as its maximum stress is higher than its tensile ultimate strength.

though the cast bronze material's maximum stress is lesser than its tensile ultimate strength, it is less stiffer than the cast steel material.