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Effects of aging temperature and humidity on the response of medium and high strength threadlockers
The Journal of Adhesion ( IF 2.2 ) Pub Date : 2021-09-15 , DOI: 10.1080/00218464.2021.1980393
D. Croccolo 1 , M. De Agostinis 1 , S. Fini 1 , G. Olmi 1 , L. Paiardini 1 , F. Robusto 1
Affiliation  

ABSTRACT

To prevent the preload loss, threadlockers are frequently used in threaded connections (e.g. to avoid self-loosening). Threadlockers are generally anaerobic adhesives and are commercially available either as semi-solid (pre-applied) or as liquid (to be applied just before tightening). Previous research deals with the frictional behavior of threaded joints with applied threadlocker. However, fasteners with applied threadlocker may sometimes operate at variable levels of temperature and humidity. A literature survey indicates there is a lack of data about the strength of joints with added threadlocker when they operate at different temperature/humidity levels with respect to conventional environmental conditions. In this research, the aforementioned issue has been tackled by means of an experimental campaign performed on liquid medium/high strength anaerobic adhesives (respectively, Loctite 243 and Loctite 270) applied to M10, 8.8 grade, zinc-coated screws. Following complete adhesive polymerization, the joints were aged in an environmental chamber, accounting for four combinations of temperature (room temperature – 90°C) and humidity (20–90%) for one week. The joints were then untightened, sampling the breakaway torque. Statistical analyses of the data were carried out, to assess the influence of each parameter on the breakaway torque of the aged joint, thus deriving useful data for design.



中文翻译:

老化温度和湿度对中高强度螺纹锁固剂响应的影响

摘要

为了防止预紧力损失,螺纹锁固剂经常用于螺纹连接(例如避免自松)。螺纹锁固剂通常是厌氧粘合剂,可作为半固体(预涂)或液体(在拧紧前使用)在市场上销售。以前的研究涉及使用螺纹锁固剂的螺纹接头的摩擦行为。然而,使用螺纹锁固剂的紧固件有时可能会在不同的温度和湿度水平下工作。一项文献调查表明,在相对于常规环境条件在不同温度/湿度水平下操作时,缺乏关于添加螺纹锁固剂的接头强度的数据。在这项研究中,上述问题已通过对应用于 M10 8.8 级镀锌螺钉的液体中/高强度厌氧粘合剂(分别为 Loctite 243 和 Loctite 270)进行的实验活动得到解决。在完成粘合剂聚合后,接头在环境室中老化,温度(室温 - 90°C)和湿度(20-90%)的四种组合持续一周。然后松开接头,对分离扭矩进行采样。对数据进行统计分析,评估各参数对老化接头分离扭矩的影响,从而为设计提供有用的数据。关节在环境室中老化,温度(室温 - 90°C)和湿度(20-90%)的四种组合持续一周。然后松开接头,对分离扭矩进行采样。对数据进行统计分析,评估各参数对老化接头分离扭矩的影响,从而为设计提供有用的数据。关节在环境室中老化,温度(室温 - 90°C)和湿度(20-90%)的四种组合持续一周。然后松开接头,对分离扭矩进行采样。对数据进行统计分析,评估各参数对老化接头分离扭矩的影响,从而为设计提供有用的数据。

更新日期:2021-09-15
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