紧固件防松性能定量评价方法

There is a lack of quantitative evaluation method for fastener's anti-loosening performance in engineering field. To solve the problem, based on the existing transverse vibration test method, the transverse vibration test equipment is improved and the critical transverse force that causes rotational loosening is proposed as a quantitative index for evaluating the anti-loosening performance, and detailed test methods and data acquisition methods are given. Based on the method, the anti-loosening performance of spring washer, wedge nut and eccentric double nut are compared. Under the experimental conditions, The results show that: ①Spring washer has no anti-loosening performance; ②Under the same preload, compared with common thread connection, the anti-loosening performance of wedge-shaped nut is improved by 116.7% at most; ③Under the same preload, compared with the common thread connection, the anti-loose performance of the double eccentric nut is improved by 125% at most; ④Under the condition of high preload, the anti-loosening performance of the wedge nut and the eccentric double nut have little difference with the anti-loosening performance of common thread connection.