Determine the fatigue strength of medium carbon steel, Mechanical Engineering

Determine the fatigue strength of medium carbon steel:

For determining the fatigue strength of medium carbon steel 15 specimens, identical in all respect were tested in cantilever rotating beam fatigue testing machine. The ultimate tensile strength of steel was known to be 550 MPa and test began at 275 MPa with a fixed step of 5 MPa. Determine the fatigue strength if results obtained are described below.

2309_Determine the fatigue strength of medium carbon steel.png

Solution

As a first step plot survival (o) and failure (x) pattern form visual depiction. From the plot it is seen that the lowest level at which survival is obtained is σo = 275 MPa. Calculations are made by the help of the table.

483_Determine the fatigue strength of medium carbon steel1.png

Figure: Failures Survival Pattern

Eq. (22) is utilized for calculating fatigue strength, σe.

1253_Determine the fatigue strength of medium carbon steel2.png

Substituting

1963_Determine the fatigue strength of medium carbon steel3.png

σ e  = 275 + 5 (( 7/8) + (1/2))

= 281.875 MPa.

Say 282 MPa    (Ans.)

Posted Date: 1/23/2013 2:36:00 AM | Location : United States







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