How would an S-N diagram be produced for PMMA? What factors would need to be taken into account to develop an appropriate test matrix?
To produce s S-N curve for PMMA material, fatigue test is done on the specimen made up of PMMA. Fatigue test is done by applying alternating stress below yield point untill the fracture of material occurs. This is done by using alternating fatigue bending machine, which apply bending moment to the component of given dimensions and at room temperature. The frequency of application of fatigue load is changes and due to change in frequency,fatigue life also increases. The amplitude of stress is also changes and life of components is calculated using:
Sigma= a x Nb
Where a and b are constant determined by curve fitting equation.
Factor to be considered:
1. To prevent specimen from buckling in compression only tension to tension load is applied with a load ratio of 0.01
2. The stress is applied below the yield point, in order to avoid failure in starting.
3. The number of loading cycle is generally taken as 106 because above it material life become infinite.
4. The fatigue strength of material is depend upon tensile strength of material.
How would an S-N diagram be produced for PMMA? What factors would need to be taken...
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