The Effect of Dwell Time on the Static Friction in Creeping Elastic–Plastic Polymer Spherical Contact

Malamut, S.; Kligerman, Y.; Etsion, I.

doi:10.1007/s11249-009-9445-3

Cited by 17 publications

(4 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Many authors220233738 have reported that that the static friction coefficient of rubber depends on the initial dwell time and the rate of starting, which is definitively consistent with our results. Here, this effect is even stronger under lubricated conditions.…”

Section: Discussionsupporting

confidence: 93%

“…The μ s is known to be sensitive to the dwell time before the actual movement2021222324, which is very likely from the increasing real contact area as a function of the contact time. The effect of the dwell time on the static friction was studied in the linear friction tester by loading the rubber sample against a dry or wet glass surface with a force of 400 N for different dwell times ranging from 2 to 600 s. Figure 4 confirms that the dwell time substantially influenced the static friction force on dry glass.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Onset of frictional sliding of rubber–glass contact under dry and lubricated conditions

Tuononen

2016

Sci Rep

View full text Add to dashboard Cite

Rubber friction is critical in many applications ranging from automotive tyres to cylinder seals. The process where a static rubber sample transitions to frictional sliding is particularly poorly understood. The experimental and simulation results in this paper show a completely different detachment process from the static situation to sliding motion under dry and lubricated conditions. The results underline the contribution of the rubber bulk properties to the static friction force. In fact, simple Amontons’ law is sufficient as a local friction law to produce the correct detachment pattern when the rubber material and loading conditions are modelled properly. Simulations show that micro-sliding due to vertical loading can release initial shear stresses and lead to a high static/dynamic friction coefficient ratio, as observed in the measurements.

show abstract

Section: Discussionsupporting

confidence: 93%

Section: Resultsmentioning

confidence: 99%

Onset of frictional sliding of rubber–glass contact under dry and lubricated conditions

Tuononen

2016

Sci Rep

View full text Add to dashboard Cite

show abstract

“…Differences are possibly due to a larger area of interaction that is expected with the greater surface conformity of softer gels. Similar observation reported for the effect of dwell time in creeping elastic-plastic polymers (Malamut et al, 2009) and articular cartilages that was reinforced with tissueinterpenetrating polymers (Cooper et al, 2017). COF values of hard gels, more like a solid base body, stayed at a constant friction level, in contrast to soft gels, for which a slight steady increase was observed during the duration of the tribological tests.…”

Section: Surface Chemistry Determination X-ray Photoelectron Spectroscopysupporting

confidence: 81%

A simple cornea model for the tribological performance assessment of the lubricating eye drops

Göçerler

Medina

Adler

et al. 2021

ILT

View full text Add to dashboard Cite

Purpose Dry eye syndrome is one of the most common reasons for eye-related discomfort which, without treatment, in some cases may even lead to corneal damage. Blinking, baseline and reflex lachrymation and drainage compromise the topical application of therapeutics demanding repeated, often hourly applications of common lubricants. In contrast, topically administered chitosan-N-acetylcysteine-based eye drops were reported to sustain on the ocular surface for more than 24 h. The thiolated biopolymer can interact with the corneal mucin layer thereby forming covalent disulphide bridges, which may contribute to extended residence times. Design/methodology/approach In this study, the tribological characteristics of four different lubricants including hyaluronic acid and chitosan-N-acetylcysteine containing commercially available eye drops were investigated. For this purpose, a representative test setup was developed, which mimics the contact between the cornea and the eyelid wiper. Gels with different elastic properties coated with a mucin layer were used as a substrate to mimic the corneal surface. Tests were conducted with a micro-tribometer, and friction values were recorded. Contact zones were characterized by X-ray photoelectron spectroscopy to investigate wear and thiol bonding on the surface. Findings Results revealed the lowest average coefficient of friction values for chitosan-N-acetylcysteine-based eye drops and substrate dependence of the test setup. Originality/value In this study, the authors introduced an in vitro system to test different types of eye drops so that chemical interaction with the mucin layer can be observed. These interactions change the tribological performance significantly and must be considered to have results relevant to the actual application.

show abstract

“…Based on this analysis, they also found that the residence time had an obvious effect on interface properties, but the relationship between residence time and friction was ignored. Malamut [21] and Kasem [22] presented experimental research on the time effect of static friction forces on spherical polymers, and they found that the time effect of the static friction force is related to the creep of materials; they proposed a theoretical creep model.…”

Section: Introductionmentioning

confidence: 99%

An Experiment on the Dwell Time Effect of Rubber Seal O-Rings: Friction Force in Intermittent Reciprocating Motion

Bai,

Wang,

Yang

2024

Materials

View full text Add to dashboard Cite

The adhesive force between two contact surfaces often leads to an increase in the friction force of the rubber seal O-ring after a certain dwell time, forming dwell time effects and affecting the reliability of sealing. The dwell time effect may result in substantial instability with respect to the frictional behavior of rubber O-rings, which needs to be carefully taken into account in the design of rubber seals. Therefore, in this paper, the dwell time effect of the friction force was studied experimentally for intermittent reciprocating rubber seal O-rings coupled with stainless steel 316L and a sealing air medium. The friction force of three kinds of rubber materials, including fluorine rubber (FPM), silicone rubber (SI), and nitrile rubber (NBR), was measured under different dwell times, compression ratios, and seal pressure. The results showed that there was a rolling frictional force, and the second peak value of the frictional force caused by the O-ring's rolling under shear action and after the maximum static frictional force was observed at the starting stage of reciprocating motion. For FPM O-rings, the rolling friction force was much greater than the maximum static frictional force at about four times the value of the compression ratio at 9% and seal pressure at 0; moreover, the force was much greater at greater compression ratios. The dwell time effect was significant in the friction forces of rubber O-rings. The friction force increases with an increase in dwell time. The increase in maximum static friction force exceeded 50% after 5 dwell days. The increase in seal pressure led to the disappearance of the rolling friction feature and the rapid increase in friction during the starting stage. Under gas seal pressure conditions, the dwell time effect still led to a significant increase in friction force. The obtained results might provide guidance for the material selection of sealing designs.

show abstract

The Effect of Dwell Time on the Static Friction in Creeping Elastic–Plastic Polymer Spherical Contact

Cited by 17 publications

References 31 publications

Onset of frictional sliding of rubber–glass contact under dry and lubricated conditions

Onset of frictional sliding of rubber–glass contact under dry and lubricated conditions

A simple cornea model for the tribological performance assessment of the lubricating eye drops

An Experiment on the Dwell Time Effect of Rubber Seal O-Rings: Friction Force in Intermittent Reciprocating Motion

Contact Info

Product

Resources

About