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Stress Riser
From WikiPedalia
A stress riser is a notch, crack or other irregularity in the surface of a part which creates a starting part for a crack or tear. A familiar household example of stress risers is cellophane: It is fairly difficult to start a tear in a straight edge of a piece of cellophane, but once a tear has started it is almost impossible to stop.
A similar effect occurs with other materials, including those used to build bicycle frames. Good design avoids placing stress risers in heavily loaded areas of the frame.
