ENEM20004 FEA For Engineering Design :

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Task Description:

This is an individual assessment in which you will perform a comprehensive finite element analysis on any ONE of the following problems.

You will verify and validate your FEA results by invoking the relevant theoretical frameworks. Please refer to the Criteria Referenced Assessment (CRA) document to get more clarity on how you will be assessed.

Problem 1:

A cantilevered spring of constant flexural rigidity EI is loaded as shown in Figure 2 below. A fully reversed loading may be assumed at end B.

Figure 1 Cantilevered Spring

1. Select a cross section of your choice and dimensions for the model
2. Assume suitable material properties
3. Assume a fixed support at A
4. Set up an FE model and analyse the deflection at B
5. Examine the stresses occurring along the radius of curvature
6. Set up a stress life fatigue analysis. Examine and comment on the fatigue characteristics of the system (life, damage, fatigue sensitivity and safety factor)
7. Verify and validate the deflection using the formula given below

Hint:

B                           ë                                               û

Deflection can be estimated from: d = P é4L3 + 6p RL2 + 24R2 L + 3p R3 ù

12EI

Problem 2:

Perform a fatigue analysis on a stepped shaft with and without a fillet weld. Refer to figure below for general guidance:

P

Figure 2 Configuration of a Stepped Shaft

1. Assume suitable material properties. The whole shaft can be made of one material or you can assume two different materials
2. Select your choice of dimensions, axial load and torque for the model
3. Set up an FE model and analyse it
4. First perform a fatigue analysis on the stepped shaft with no fillet at B
5. Create a fillet at B and repeat the fatigue analysis
6. Compare the influence of the fillet radius on the Factor of Safety and fatigue life sensitivity
7. You may use the fully reversed loading condition
8. Compare the FoS using the different fatigue failure criteria
9. Comment on your results and observations

The portfolio template would include:

1. Problem description
2. Assumptions
3. Boundary conditions and loadings
4. Solver settings
5. Results & Analysis – Postprocess your results
6. Discussion on postprocessing

• Conclusions
• References
• Appendix

Submit your portfolio as one PDF document via the submission link on the unit Moodle site.

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