Unexpected friction behaviours due to capillary and adhesion effects

Guo, Fei; Tian, Yu; Liu, Ying; Wang, Yuming

doi:10.1038/s41598-017-00238-0

Cited by 13 publications

(7 citation statements)

References 20 publications

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“…This should be explored in future experiments using deuterated water (D 2 O) instead of water. Despite these complications, it is clear that water plays a unique role in sliding friction and its mere presence does not necessarily lead to facile sliding. − …”

Section: Resultsmentioning

confidence: 99%

Interstitial Water Enhances Sliding Friction

et al. 2018

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This study examines how surfaces with different water contact angles (wettability) affect dry and underwater adhesion and friction. These studies were conducted by bringing a deformable hydrophobic poly(dimethylsiloxane) lens in contact with surfaces of gradient wettability. On the basis of our adhesion and friction results, we divide the results in three regions. In region I (water contact angles greater than 80°), the dry adhesion is lower than underwater adhesion. In contrast, in region III, (water contact angles less than 50°), the dry adhesion is higher than underwater adhesion. For surfaces with water contact angles between 50 and 80° (region II), the dry and wet adhesion values are comparable. Interestingly, in this region II, the underwater coefficient of friction (COF) values are higher than those in regions I and III. We have used surface-sensitive sum frequency generation (SFG) spectroscopy to probe whether the contact interface in static conditions and during dynamic sliding is dry or wet. The SFG results reveal that the contact is dry in region I. If this dry contact is maintained, the underwater COF follows the trend of adhesion hysteresis in dry conditions (adhesion hysteresis decreases with an increase in water contact angles). In region III, the contact is wet and the underwater COF follows the trend for adhesion hysteresis in wet conditions (adhesion hysteresis increases with an increase in water contact angles). By knowing whether the contact interfaces are dry or wet, we can relate the trends in COF with the trends in adhesion hysteresis. For conditions where the contact interfaces have both dry and wet patches (region II), the COF values are higher than those in completely dry conditions, suggesting that a partially lubricated system can exhibit a higher COF.

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Section: Resultsmentioning

confidence: 99%

Interstitial Water Enhances Sliding Friction

et al. 2018

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“…This trend can be explained through Figure 20, in which all stages from the dry contamination to the condition at the end of the testing are schematically presented. In Figure 20, the performance of the contamination before adding water and after that is explained under the load of the BPT slider [45].…”

Section: Contamination and Rainfall Changes Resultsmentioning

confidence: 99%

How Can Sustainable Materials in Road Construction Contribute to Vehicles’ Braking?

2020

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Vehicles’ braking is a key factor towards safer driving. In particular, tyre–pavement friction is connected with both industry and infrastructure requirements in terms of tyre characteristics and frictional properties of pavement surfaces respectively that both contribute to safe braking. For this reason, tyre–pavement friction is considered as one of the most pressing emergencies in roadway assets in order to reduce skidding related accidents. At the same time, sustainability aspects have been raised in modern infrastructure engineering. Hence, an issue is introduced on how sustainable materials used for pavement construction may contribute to tyre–pavement and consequently vehicles’ braking. For this reason, a laboratory process is developed to investigate the frictional properties of several utilized in pavement wearing courses including both traditional and sustainable materials (reacted activated rubber—RAR and reclaimed asphalt pavement—RAP). Environmental conditions (seasonal temperature changes, rainfall effect and contamination caused by dust formation) are simulated in the laboratory and vehicles’ braking is investigated using the British Pendulum Tester (BPT). Results provide a good explanation for the vehicles’ braking ability under the investigated conditions for both traditional and sustainable materials. Ultimately, it is proved that asphalt mixture types with RAR modifier or RAP material exhibit a satisfactory performance towards providing a safe road surface for the moving vehicles.

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“…Characterizing the surface microtopography and wear debris state is beneficial to understanding the friction behaviors between bolted interfaces. 24,25 Taking the moving specimen as an example, a white displacement between the interfaces is relatively large, and the shearing and fracture of the asperities are more likely to occur. As a result, the peak-to-valley height of the surface will decrease and the relative surface heights basically do not exceed 10 μm.…”

Section: Microscopic Topography Surface Analysismentioning

confidence: 99%

Analysis of friction‐related acoustic emission in bolted joint structures

Sun,

Yang,

et al. 2023

Int Journal of Mech Sys Dyn

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A bolted joint may be in a state of continuous fretting friction and wear under random oscillatory loading, which makes the bolted joint prone to loosening. Therefore, it is essential to find a way to monitor the contact state of a bolted joint on time and handle it adeptly. Acoustic emission (AE) signals will be generated during the reciprocating friction of the bolted joint interface. Exploring the relationship between the frictional slip features and the acoustic emission characteristics under different bolt preloads can lay the foundation for using the acoustic emission techniques to monitor the pretightening state of bolted joints. This paper experimentally investigates the acoustic emission signals of a bolted joint structure during friction under different preloads, three repeated tests are implemented. The relationship between friction behavior and acoustic emission characteristics under different preloads is studied. The evolution of classical acoustic emission parameters and kinematic parameters with bolt preload levels is also analyzed. The 3‐D topography of the specimens after parametric tests is analyzed. The results show that the characteristics of both burst‐type and continuous‐type acoustic emission can reflect different friction behavior under different bolt preloads. The evolution curves of acoustic emission parameters changed under the interaction of both frictional kinematic parameters and bolt preload levels. For the 3‐D surface topography, the reciprocating friction shears the peaks and fills the surface valleys, and the topography of the scratched surface areas is redistributed.

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Unexpected friction behaviours due to capillary and adhesion effects

Cited by 13 publications

References 20 publications

Interstitial Water Enhances Sliding Friction

Interstitial Water Enhances Sliding Friction

How Can Sustainable Materials in Road Construction Contribute to Vehicles’ Braking?

Analysis of friction‐related acoustic emission in bolted joint structures

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