Which of the following statements are correct while designing a component for fatigue?
I. Stress life method is used for designing for low cycle and high cycle fatigue
II. Strain life method involves analysis of plastic deformation at a localized region.
III. Linear-elastic fracture mechanics use the fracture toughness of the material.
IV. Paris equation is used to determine the rate of crack growth.
Choose the best option from below :
1
I and II are correct but III and IV are incorrect
2
II and III are correct but I and IV are incorrect
3
I, II and III are correct but IV is incorrect
4
I, II, III and IV are correct