Stress Analysis and Material Selection for Hydrogen Storage Tank NEM3202
- Subject Code :
NEM3202
- University :
University of New south Wales Exam Question Bank is not sponsored or endorsed by this college or university.
- Country :
Australia
NEM3202
Portfolio 3 (Weight 5% of total mark)
An industrial compressed hydrogen storage tank is designed as a thin-walled cylindrical pressure vessel with hemispherical end caps. The tank has the following specifications:
- Internal radius: 600 mm
- Wall thickness: 10 mm
- Operating internal pressure: 4 MPa
To ensure safety, two different materials are being considered for fabrication:
- Material A: Yield strength = 250 MPa, Ultimate tensile strength = 400 MPa
- Material B: Yield strength = 180 MPa, Ultimate tensile strength = 320 MPa
Tasks:
- Determine the hoop (circumferential) stress and longitudinal stress in the cylindrical section of the vessel.(5 marks)
- Determine the stress in the hemispherical end caps of the vessel. (3 marks)
- Compare the maximum induced stress in both sections and determine the critical region of the vessel. (4 marks)
- Calculate the factor of safety (FoS) for both materials using the yield strength (4 marks)
- Recommend the most suitable material based on safety considerations, including the potential for yielding and failure. (4 marks)
Mark Distribution for Stress Analysis and Material Selection for a Pressure Vessel
Part A
Criterion |
Description |
Mark Allocation |
Hoop and Longitudinal Stress in Cylindrical Section |
Correct application of thin-walled pressure vessel formulas, accurate substitution, and correct final answers. Partial marks for minor errors. |
5 |
Stress in Hemispherical End Caps |
Correct formula usage and calculation of hemispherical stress. Partial marks for minor errors. |
3 |
Comparison of Stresses & Identification of Critical Region |
Logical comparison of hoop, longitudinal, and hemispherical stresses. Correct identification of the critical region. |
4 |
Factor of Safety Calculation for Both Materials |
Correct formula, correct application of yield strength, accurate factor of safety values for both materials. Partial marks for minor mistakes. |
4 |
Material Selection and Justification |
Clear reasoning based on factor of safety, stress levels, and safety considerations. Well-explained recommendation. Partial marks if justification lacks depth. |
4 |
Total |
20 |
Additional Guidelines for Grading:
- Presentation & Clarity: Deduct up to 1 mark per section for poorly organised or unclear solutions (make sure I can read you handwriting).
- Units: Deduct 5 marks per error if units are missing or incorrect.
- Unless otherwise stated, all final numerical answers must be rounded to three decimal places: Deduct 0.5 marks per error.
- Logical Flow: Students must demonstrate a structured approach to problem-
