Official Answer
Answer
Diagnosis of centrifugal dislodgement involves inspecting the ring and the groove for specific indicators. If the ring is found outside the groove and appears 'stretched' (its free diameter is now larger than its original manufactured diameter), but there are no shear marks on the groove edge, it likely expanded due to RPM. If the ring has 'burnished' or 'shiny' marks on its inner diameter, it indicates that it was spinning relative to the shaft before it dislodged. The forensic engineer would calculate the lift-off speed using $N = \sqrt{(K \cdot E \cdot I) / (w \cdot R^3)}$ and compare it to the motor's peak RPM. If the motor exceeded this speed, the design requires a self-locking spiral ring or a higher-interference fit.
