Question
Problem 3 (10 pts.) At location of interest in a member made of the 2024-T4 Al alloy the material is repeatedly subjected to the uniaxial stress history shown in figure. Estimate the number of repetitions, Bf necessary to cause fatigue failure. The 2024-T4 Al alloy has the following properties: σ = 303 MPa, σ = 476 MPa, σf' = 900 MPa, A = 839 MPa, and b = B=-0.102. Solution: 290 -50 σ, Stress, 500 MPa 200 110 1 2 3... 19 20 1 2 3.... 49 50 time One repetition
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