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.
Due to the characteristics of space products such as long life, harsh and complex service environment, various metal materials used in space products are put forward strict requirements. The sample box of a low-temperature equipment will have "dew point" corrosion in the low-temperature -80℃ working environment, and the anti-corrosion performance of the material surface directly affects whether the sample box can serve in the harsh and complex environment for a long time. Through the selection of parts material, parts and components surface anti-corrosion treatment, enhance the anti-corrosion performance of components in low temperature environment. To explore the shear strength and peel strength of low-release one-component RTV and space-grade RTV at room temperature and -80℃, as the guiding parameters for the selection of anti-corrosion coating, and finally realize the sample box in the low-temperature -80℃ environment with high reliability and long life.
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