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Tests on Loosening of Aviation Threaded Fasteners with Different Washer Configurations

机译：不同垫圈配置的航空螺纹紧固件的松动测试

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摘要

This paper presents results from an experimental investigation on loosening of aviation threaded fasteners with internal teeth lock washers and plain washers. The tests are performed on a transverse test machine which provides dynamic shear. Five different configurations are tested: (1) only lock washer, (2) lock washer on plain washer, (3) no washers, (4) only plain washer, and (5) lock washer on hardened plain washer. The resistance to loosening of these configurations is assessed by comparing loss of preload versus cycles of dynamic shear loading. Internal teeth washers used alone under a plain nut without additional plain washer are found to provide the worst case with respect to loosening resistance. Use of a plain washer under the lock washer provides significant improvement in resistance to loosening. In addition to providing protection to clamped part surfaces and better load distribution in a joint, the data presented reveals the use of plain washers under a plain nut can provide improved resistance to loosening. Relative hardness of the components, e.g., plain washer compared to lock washer, influence the performance.
机译：本文介绍了通过对带有内齿锁紧垫圈和平垫圈的航空螺纹紧固件的松动进行实验研究的结果。测试在提供动态剪切力的横向测试机上进行。测试了五种不同的配置：（1）仅锁紧垫圈，（2）平垫圈上的锁紧垫圈，（3）没有垫圈，（4）仅平垫圈，以及（5）硬化平垫圈上的锁紧垫圈。通过比较预载荷损失与动态剪切载荷循环的比较，可以评估这些结构的抗松动性。发现在普通螺母下单独使用而没有额外普通垫圈的内齿垫圈在抵抗松动方面提供了最坏的情况。在锁紧垫圈下面使用平垫圈可显着改善抗松动性。除了为被夹紧的零件表面提供保护并在接头中更好地分配载荷外，所提供的数据还表明，在普通螺母下使用普通垫圈可以提高抗松动性。部件的相对硬度（例如，平垫圈与锁紧垫圈相比）会影响性能。

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