ENGT5258: Creep and Fatigue - Advanced Solid Mechanics - MATLAB - Engineering Assignment Help

Assignment Task:

Learning Outcomes:

1. Creep relaxation calculations, factors affecting creep.

2. Fatigue life methods, cumulative fatigue determination methods.

3. Endurance limit and modifying factors.

Questions:

1. Explain and discuss the following in terms of creep with practical examples

1. Stress relaxation

2. Creep rupture strength

3. Creep life

4. Factors affecting creep

2. A secondary creep rate is given in the table below were obtained from creep tests carried out on Aluminium alloy at 100? C

Determine the parameters of the Norton power law for creep:

E' s = Aσ n

Where E' s is the secondary creep rate, σ is stress, and A & n are constants. The result should include MATLAB polyfit with clear steps.

3. The secondary creep rates are given in the table below obtained from a series of tensile tests as various temperatures under the same load.

Consider the material complies with Arrhenius definition:

E' s = D exp ( − Q RT )

Given the molar gas constant as R = 8.314 Jmol−1K −1.

Determine the activation energy and the constant for secondary creep and hence identify the material. The result should include MATLAB polyfit with clear steps.

4. In a cylindrical vessel, a pressure of 1.5MP a acts on a circular cover plate. The cover plate has a diameter of 450mm and is held in a position by thirty bolts of 20mm diameter, equally spaced around the rim. Ignoring primary creep but account for elasticity with E=210GPa and a secondary creep rate of 32.2 × 10−17σ 4h −1 , where σ is in MPa: Given that

t m = 1 AE (n − 1) ( 1 σ n−1 − 1 σ n−1 0 )

Where all symbols have their standard meaning, A and n can be found from creep rate. Determine

1. The initial tightening stress in the bolts in order that a safety factor of 1.6 is maintained after 8000hrs of creep relaxation at 500? C.

2. The time when the bolts should be re-tightened to prevent leakage around the plate. 

5. Give a brief description of the following:

1. Explain the three major fatigue life methods and their benefit and limitations.

2. Discuss the endurance limit with practical examples, also include endurance limit modifying factors.

3. Briefly explain with examples the meaning of stress concentration and notch sensitivity

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