Concept explainers
A 10-mm steel drill rod was heat-treated and ground. The measured hardness was found to be 300 Brinell. Estimate the endurance strength in MPa if the rod is used in rotating bending.
The endurance strength.
Answer to Problem 1P
The endurance strength is
Explanation of Solution
Write the expression for the ultimate tensile strength of the steel.
Here, the ultimate tensile strength is
Write the expression for the endurance limit of the steel.
Here, the endurance limit is
Write the expression for the surface factor
Here, the surface factor is
Write the expression for the size factor.
Here, the size factor is
Write the expression for Marin equation.
Here, the endurance strength of the material is
Conclusion:
Refer to Table 6-2 “Parameters for Marin Surfaces Modification Factor”. Obtain the values of factors for ground surface finish as,
Substitute
Substitute
Substitute
Substitute
Substitute
The endurance strength is
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