Question

For steel member is subjected to cyclic loads,

The experimental results indicated failure at a number of cycles of 52 when the maximum stress is 1071 MPa. Also, failure at a number of cycles of 380,000 when the applied maximum stress is 506 MPA.

1. Find the fatigue equations for stress vs number of cycles using

σ = A N^B And σ = A (2N)^b

2) Plot on the same diagram both functions

3) Discuss the results of the two plots.

4) Find the number of cycles to failure when the maximum stress is 950 MPa in both functions

Answer 1