Week 1 Spur Gear Challenge

AIM:

Objective 1:

• Case 1:
  

Using Cast Iron(ductile) as a material, carry out a static structural analysis to find out Equivalent stress, Total deformation and Stress intensity(Learn about what stress intensity is). Find location for possible fracture

• Case 2:

Using Cast Steel as material, perform the same analysis for the results as in Case 1.

• Case 3:

Using Cast Bronze as material, perform the same analysis for the results as in Case 1.

Objective 2:

Write a detailed report comparing the results of the three cases and conclude which material would you recommend based on these results.

Procedure:

• Open the ANSYS work Bench and we should selecet the static structural from the left side component box and draw to the panel.
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• We should edit the Engineering Geomentry for the required given property as cast iron.
• Go the Ansys Grant material data and we should find the cast iron from the give Data.
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• These are the properties of the Given cast iron ie density,Youngs modulus,possion ratios.
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• After the select the proper material we should go to the geomentry and import the spur gear model from the data.
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• 
• After downloading the model we should have to rename the spur gear as right and left.
• After that we should provide the contact to the both gears.Go to connection>contact>Select the tooth of the both geomentry.
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• After that we should have to create the joints to the both surface from right to left.
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• we should have to provide the revolute joints to both and we should have to provide the roation to the joints with 0 dgrees to 180 degrees.
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• we should also provide the moment to the model.
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Cast Iron

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Stress

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Strain

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Total Defromation

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Cast Bronze:

Stress

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Strain

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Total Deformation

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Cast Steel

Stress

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Strain

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Total Deformation

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Comparssions of the results:

Material Stress strain Total Deformation

Max Min Max Min Max Min

Cast Iron 2.107e+010pa 0.3155pa 0.24210m/m 4.4698e-012m/m 5.0397e-003 2.906e-003m

Cast Bronze 1.4934pa 2.5785e+10pa 0.2455m/m 1.6737e-011m/m 5.036e-003m 2.906e-003m

Cast Steel 5.1602e+010pa 1.2767pa 0.24938m/m 7.4708e-012m/m 5.0413e-003m 2.906e-003m

For the all this material stress is maximum obtained at the Tooth of the teeth.Similary the strees intensity is also measured at the Maximum deformation.

Equivalent Stress: Cast Steel>Cast Iron> Cast Bronze

Stress Intensity: Cast Steel>Cast Iron> Cast Bronze.

CONCLUSION:-

Static structural analysis was carried out successfully on spur gear having the following types of materials,

Case-1: Cast Iron
Case-2: Cast Bronze
Case-3: Cast Steel
Based on the traditional strength of materials approach i.e., from the results of Equivalent stress and Total deformation for all the cases of spur gear,

case-2: Cast bronze is the preferred choice of material.

Based on the fracture mechanics approach i.e., from the results of Stress intensity for all the cases of spur gear,

case-3: Cast steel is the preferred choice of material.

The recommended choice of material is Cast Iron.