Endurance limit of a beam subjected to pure bending decreases with

decrease in the surface roughness and decrease in the size of the beam
increase in the surface roughness and decrease in the size of the beam
increase in the surface roughness and increase in the size of the beam
decrease in the surface roughness and increase in the size of the beam

Correct answer: increase in the surface roughness and increase in the size of the beam

Solution

The endurance limit of a beam decreases with increased surface roughness because rough surfaces can initiate fatigue cracks more easily. Additionally, larger beam sizes can lead to higher stress concentrations, further reducing the endurance limit.

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