Contact Area and Static Friction of Rough Surfaces With High Plasticity Index

Li, L.; Etsion, I.; Talke, Frank E.

doi:10.1115/1.4001555

Cited by 61 publications

(45 citation statements)

References 33 publications

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“…Additional details can be found in Ref. [10]. When the dimensionless separation h Ã 0 [ 3 the number of asperities in contact is very small [12] and the surfaces are nearly separated.…”

Section: Theoretical Analysismentioning

confidence: 99%

“…As shown in Refs. [9] and [10], the roughness of the sphere can be transferred to the flat without affecting the original contact problem. The contacting asperities and the sphere deform to provide a real contact area that supports the normal load P. The deformation of the asperities and the sphere can be elastic, elastic-plastic, fully plastic or any combination of the three types of deformation.…”

Section: Theoretical Analysismentioning

confidence: 99%

“…The dimensionless normal load P* between the two contacting surfaces under full stick contact condition is obtained from [10] as…”

Section: Theoretical Analysismentioning

confidence: 99%

“…Recently, Cohen et al [9] and Li et al [10] analyzed the contact of a rough sphere loaded by a rigid flat and relaxed previous simplifying assumptions regarding bulk and asperity deformation. They assumed that the sphere and the asperities on the sphere can have any combination of elastic, elastic-plastic, and fully plastic deformation.…”

mentioning

confidence: 99%

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Elastic–Plastic Spherical Contact Modeling Including Roughness Effects

Etsion

Talke

2010

Tribol Lett

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The effect of material properties and surface roughness on the contribution of asperities and sphere bulk displacements to the total displacement of a rough spherical contact is investigated. A dimensionless transition load, above which the contribution of the bulk displacement exceeds the contribution of the asperities displacement, is found as a function of the plasticity index and dimensionless critical interference of the sphere bulk. A criterion is proposed for evaluating the importance of surface roughness in calculating the displacement of a rough spherical contact. Some experimental results with a spherical micro-contact are presented to verify the model.

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“…Additional details can be found in Ref. [10]. When the dimensionless separation h Ã 0 [ 3 the number of asperities in contact is very small [12] and the surfaces are nearly separated.…”

Section: Theoretical Analysismentioning

confidence: 99%

Section: Theoretical Analysismentioning

confidence: 99%

“…The dimensionless normal load P* between the two contacting surfaces under full stick contact condition is obtained from [10] as…”

Section: Theoretical Analysismentioning

confidence: 99%

mentioning

confidence: 99%

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Elastic–Plastic Spherical Contact Modeling Including Roughness Effects

Etsion

Talke

2010

Tribol Lett

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“…The distance between two reference planes is approximately l = 0.01-0.021 μm (Greenwood and Tripp 1970). The mechanical properties are taken to be elastic modulus E = 181.5 GPa (Li et al 2010) and Poisson's ratio v = 0.312 (Son et al 2005). The electron mean free path is λ = 0.455 nm (Majjad et al 1999) and conductivity is K = 1.43 × 10 7 S/m (Tanuma et al 2011).…”

Section: Topographic and Materials Propertiesmentioning

confidence: 99%

Electrical contact performance of MEMS acceleration switch fabricated by UV-LIGA technology

et al. 2015

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telecommunication, radar, RF and defense systems, etc. (Li et al. 2012;Kim et al. 2012). In particular, MEMS acceleration switches can respond rapidly in specific applications without power consumption. For instance, Wang et al. (2013) developed a low-G horizontally-sensitive inertial micro-switch which switches on when an acceleration threshold is met. Fu et al. (2013) presented a novel MEMS inertial switch used for power management, which can be integrated with detection and control systems without power consumption. Deng et al. (2013) reported an inertial micro-switch based on nonlinear-spring shock stopper which can reduce contact bouncing. Ma (2013) and Kim et al. (2013) also designed several inertial switches which are capable to adjust the acceleration threshold.Electrical contact performance is one of three key parameters of the MEMS acceleration switch (The other two are response time and contact reliability respectively) (Zhou et al. 2013). Contact resistance plays a key role in electrical performance and depends on sample material, contact pressure, temperature, structure design, surface cleanliness, roughness and flatness (Zhou et al. 2013). Greenwood, et al. (1966 put forward a classic theory of elastic contact, which introduced an item named 'elastic contact hardness', a composite quantity depending on the material properties and surface topography. Li et al. (2012) presented an electrical contact resistance model and pointed out that the contact resistance is a function of contact load. Jensen et al. (2005) explored contact heating in the RF MEMS switch and demonstrated that it can reduce the contact resistance significantly. In addition, mechanical cycling would increase the contact resistance because of the insulating film on surface. Broue et al. (2010) proposed a new method to investigate the micro-scale contact mechanism and indicated that the material is a key issue of contact resistance. Jackson et al. (2012) presented the multipleAbstract This paper expanded a micro-contact resistance model to investigate the contact performance for a acceleration switch fabricated by UV-LIGA (Ultra-violet Lithographie, Galvanoformung and Abformung) technology. Based on the relationship between the contact radius a and electron mean free path λ, three different contact resistance models have been analyzed. The material properties (elastic modulus E, hardness H and Poisson's ratio v) and surface topographic parameters (asperity summit radius r, standard deviation of height distribution σ, and surface density of asperity) have been studied to evaluate the contact resistance-load characteristics. The results show that the theoretical prediction of contact resistance-load characteristics correlates well with the experimental results except there exists experimental discrepancy. The discrepancy between theoretical predictions and experimental results mainly is due to the contaminations, errors from assumptions, surface oxidation and external environmental conditions.

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Wood Derived Composites for High Sensitivity and Wide Linear‐Range Pressure Sensing

Huang

Chen

Fan

et al. 2018

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Natural wood possesses a unique 3D microstructure containing hierarchical interconnected channels along its growth direction. This study reports a facile processing strategy to utilize such structure to fabricate carbon/silicone composite based flexible pressure sensors. The unique contribution of the multichannel structure on the sensor performance is analyzed by comparing the pressure response of the vertically cut and horizontally cut composite structures. The results show that the horizontally cut composite based sensors exhibit much higher sensitivity (10.74 kPa ) and wider linear region (100 kPa, R = 99%), due to their rough surface and largely deformable microstructure. Besides, the sensors also show little hysteresis and good cycle stability. The overall outstanding sensing properties of the sensors allow for accurate continuous measurement of human pulse and respiration, benefiting the real-time health signal monitoring and disease diagnoses.

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Contact Area and Static Friction of Rough Surfaces With High Plasticity Index

Cited by 61 publications

References 33 publications

Elastic–Plastic Spherical Contact Modeling Including Roughness Effects

Elastic–Plastic Spherical Contact Modeling Including Roughness Effects

Electrical contact performance of MEMS acceleration switch fabricated by UV-LIGA technology

Wood Derived Composites for High Sensitivity and Wide Linear‐Range Pressure Sensing

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