Plain English Meaning

Small spots on a part where stress builds up much more than in the rest of the part — often a scratch, dent, or sharp corner — and where cracks tend to start.

Full Definition

Localized points on a part or structure where stress concentrates well above the level seen in the surrounding material, typically caused by abrupt changes in shape, surface defects, scratches, nicks, corrosion pits, or sharp internal corners. Stress risers are common starting points for cracks and fatigue failures in metal components.

Context Anchor

Seen during the before-takeoff and preflight check, especially when inspecting propeller blades and other airplane parts for nicks, cracks, dents, or other damage.

Derivation

From 'stress' (the internal force a material carries) and 'riser' (something that goes up). The term describes a spot where stress 'rises' above the level in the surrounding material.