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For which one of the following loading conditions is the standard endurance strength multiplied by a load factor, Ke = 0.9?

For which one of the following loading conditions is the standard endurance strength multiplied by a load factor, Ke = 0.9? Correct Answer Reversed axial loads with no bending

Concept:

Endurance strength: The stress level below which an infinite number of loading cycles can be applied to a material without causing fatigue failure.

Modification factors which affect endurance strength found experimentally Se’ are given below. Modified endurance strength Se is:

Se = Ke × Ksize × Krel × Ksurf × Knotch × Ktemp × Km × Se’

where, Se' = Endurance limit by Rotating Beam Method.

Rotating Beam Method: It is the experimental technique for fatigue test.

Load factor Ke depends on the applied type of load

LOAD

LOAD FACTOR VALUE (Ke)

Reversed compressive/bending

1

Reversed axial with no bending

0.9

Reversed axial

0.85

Reversed shear (Brittle material)

0.8

Reversed shear (Ductile material)

0.55

 

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