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27 September 2024 Analysis of bite failure in stainless steel self-locking bracket nuts and titanium alloy screws
Yongli Wang, Rongjun Li, Bin Zhang, Xin Liu, Yan Wang, Benhua Zhao, Dongsong Yang, Lin Li, Xiaohang Cui, Haiou Li
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Proceedings Volume 13261, Tenth International Conference on Mechanical Engineering, Materials, and Automation Technology (MMEAT 2024); 132612V (2024) https://doi.org/10.1117/12.3047573
Event: 10th International Conference on Mechanical Engineering, Materials, and Automation Technology (MMEAT 2024), 2024, Wuhan, China
Abstract
In mechanical assembly and engineering, the integrity of fastening systems is crucial for the reliability and durability of structures and machinery. This study investigates the failure mechanisms of stainless steel self-locking bracket nuts and titanium alloy screws, which are critical junction points in various engineering applications. Through comprehensive testing and analysis, focusing on the morphological characteristics of the failed components, the research reveals that pairing stainless steel self-locking bracket nuts with blue anodized titanium alloy screws leads to pronounced galling, known as "bite death." Remarkably, the study finds that using titanium alloy screws lubricated with molybdenum disulfide significantly mitigates this adverse effect. Specific data indicate that untreated screws required torques of 2Nm, 3Nm, and 5Nm for M3, M4, and M5 sizes, respectively, while treated screws only required torques of 0.2Nm, 0.7Nm, and 0.9Nm to pass through the self-locking nuts. This investigation highlights the importance of material compatibility and lubrication in preventing fastener failure, providing essential insights for optimizing screw and nut combinations in engineering designs.
(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.
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Yongli Wang, Rongjun Li, Bin Zhang, Xin Liu, Yan Wang, Benhua Zhao, Dongsong Yang, Lin Li, Xiaohang Cui, and Haiou Li "Analysis of bite failure in stainless steel self-locking bracket nuts and titanium alloy screws", Proc. SPIE 13261, Tenth International Conference on Mechanical Engineering, Materials, and Automation Technology (MMEAT 2024), 132612V (27 September 2024); https://doi.org/10.1117/12.3047573
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KEYWORDS
Titanium
Alloys
Stainless steel
Molybdenum
Aerospace engineering
Failure analysis
Reliability
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