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Anti-loosening performance detection method of nuts

Update:10-10-2020
Summary:

The anti-loosening performance of the nut is tested by […]

The anti-loosening performance of the nut is tested by vibration experiments. In order to facilitate comparison, we also carry out anti-loosing performance testing on standard nuts, nuts + washers, standard double nuts, pressed three-point nuts, and nylon nuts.
All experiments are carried out in accordance with the national standard GB/T 10431-1989 "Fastener Transverse Vibration Test Method". The experimental conditions are also completely the same, that is, the size of the test nut is M16×2.0; the performance level is 10; the vibration frequency is 12.5 Hz; the vibration amplitude is 1.6 mm, and the vibration force is 8.2 KN.
The axial force of the standard nut, nut + washer, standard double nut and pressure three-point nut all attenuate to 0 within 200 seconds after the vibration starts. The loss of the axial force indicates that the nut is loose and invalid. After the vibration of the nylon nut starts, the axial force attenuates rapidly, and remains basically unchanged after reaching 20kN, and the overall axial force attenuates by 70.5%. This shows that the performance of nylon nuts is slightly better than the previous four types of nuts.
After the nut starts to vibrate, the axial force is only slightly attenuated. During the entire vibration period, the axial force remains above 60kN, the overall attenuation of the axial force is less than 10%, and the anti-loosening effect basically maintains the initial state. It can be seen that the anti-loosening performance of the nut is better than other nuts.

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