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A rectangular bar with a circular hole is to be made of a material with actual maximum permissible stress of 150 MPa. If stress concentration factor for the configuration is 3.0, what is the nominal average stress for sizing the section?

A rectangular bar with a circular hole is to be made of a material with actual maximum permissible stress of 150 MPa. If stress concentration factor for the configuration is 3.0, what is the nominal average stress for sizing the section? Correct Answer 50 MPa

Concept:

Stress developed at irregular section = Normal average stress × Stress concentration factor

Stress developed at irregular section ≤ maximum permissible stress

Calculation:

Given:

Stress concentration factor = 3 , maximum permissible stress = 150 MPa

Stress developed at irregular section ≤ maximum permissible stress

∴ Normal average stress × stress concentration factor ≤ 150

Normal average stress × 3 = 150 

∴ Normal average stress = 50 MPa 

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