Modelling the static contact between a fingertip and a rigid wavy surface

Urribarri, A.C. Rodriguez; Heide, Emile van der; Zeng, Xiangqiong; Rooij, M.B. de

doi:10.1016/j.triboint.2016.05.028

Cited by 14 publications

(6 citation statements)

References 30 publications

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“…Thus, as the pressure from fingertip was released, the PVA/LP film on the aforementioned location was subject to a compression from the PDMS substrate, which generated wrinkles. Notably, although the typical depth of a fingertip valley is only ≈42 µm, [ 52 ] this device can still reproduce the finger print pattern with a high fidelity and excellent resolution (see Figure 1g). This remarkable performance can be attributed to the restraint of stress transfer on the film with the presence of distributed cracks that break the film continuity, as well as the guidance of wrinkle growth and orientation from the cracks.…”

Section: Resultsmentioning

confidence: 99%

Tailoring Multistimuli Responsive Micropatterns Activated by Various Mechanical Modes

Zeng

Shen

et al. 2021

Adv Funct Materials

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A versatile wrinkle‐based micropatterned system with a film‐substrate structure is proposed, which contains a hydrophilic film of polyvinyl alcohol or its composite with laponite and a hydrophobic substrate of polydimethylsiloxane or its composite with carbon black. The wrinkled system features high design flexibility and multistimuli responsiveness, which can be activated by various mechanical methods, including vertical press or scratch, gentle stretch‐and‐release, bend, or analogous magneto‐mechanical and electro‐mechanical modes. The resultant wrinkles possess 1) instantaneous and reversible strain/moisture/light responsive optical modulation; 2) tunable dynamics for the aforementioned strain/moisture/light response;3) tailorable amplitude/wavelength; 4) unique surface morphologies from the coupling of wrinkles and cracks; 5) excellent reversibility and durability. A variety of applications are demonstrated based on this system, including 1) a moisture erasable highly sensitive pressure responsive device and pattern replicator with a high fidelity; 2) a moisture erasable scratch/magneto‐mechanical re‐writable tablet; 3) an electro‐mechanical controllable smart window with an ultra‐sensitive strain responsive transmittance modulation and a low operating voltage; 4) various types of strain responsive, moisture erasable, and laser writable information recording/encryption devices. This work provides new routes for designing innovative wrinkled systems triggered by diverse mechanical fashions and can decode multiple environmental stimuli into optical signals for widespread application.

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Section: Resultsmentioning

confidence: 99%

Tailoring Multistimuli Responsive Micropatterns Activated by Various Mechanical Modes

Zeng

Shen

et al. 2021

Adv Funct Materials

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“…After the point of transition, the real contact area of the skin is expected to escalate, thus leading to the increase in the observed friction coefficient. While such effect was discussed by other researchers [18,30,31], its development with normal load was not shown experimentally. At the point of transition, a combined micro displacement of the asperities and the skin equals the asperity height.…”

Section: Introductionmentioning

confidence: 87%

“…Inclination angle and sliding velocity were controlled manually and were kept similar to the ones used in the friction measurements. Obtained images were filtered by histogram equalization and converted into a binary image by setting a threshold value [31,34], which is further described in the supplementary material. The total number of pixels from the binary image was multiplied by a scanner resolution to calculate apparent contact areas.…”

Section: Apparent Contact Area Measurementsmentioning

confidence: 99%

An Empirical Approach for the Determination of Skin Elasticity: Finger pad Friction against Textured Surfaces

2019

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“…In recent work by Rodriguez Urribarri, the real area of contact between the finger ridges pattern and a rigid wavy surface was calculated analytically using the double-Westergaard model [97].…”

Section: Condensed Review On Modelling the Real Contact Areamentioning

confidence: 99%

The static friction behaviour of skin with relevance to pressure ulcer prevalence

Klaassen¹

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dat de micro-omgeving een grote invloed heeft op de wrijvingscoëfficiënt. Zowel de temperatuur als de relatieve vochtigheid hebben een sterke invloed op het wrijvingsgedrag. Dit werk suggereert dat, vanuit tribologisch oogpunt, het verminderen van de luchtvochtigheid de primaire focus zou moeten zijn. Het effect van oppervlakteruwheid en hardheid werd onderzocht met siliconen tegenoppervlakken die gewoonlijk worden gebruikt voor prothese liners. Door gebruik te maken van oppervlakteruwheid en het variëren van de compliantie van het siliconen tegenoppervlak, kan de wrijvingscoëfficiënt worden gewijzigd.De verkregen resultaten zijn gecombineerd in twee ontwerpdiagrammen waarin de wrijvingscoëfficiënt wordt weergegeven als functie van verschillende parameters. Eén diagram is voor het optimaliseren van de micro-omgeving in de huid-object-interface, en één met betrekking tot oppervlakken in contact met de huid die gecontroleerde niveaus van wrijving vertonen met het doel om omstandigheden voor het voorkomen van drukverwonding te optimaliseren.

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Modelling the static contact between a fingertip and a rigid wavy surface

Cited by 14 publications

References 30 publications

Tailoring Multistimuli Responsive Micropatterns Activated by Various Mechanical Modes

Tailoring Multistimuli Responsive Micropatterns Activated by Various Mechanical Modes

An Empirical Approach for the Determination of Skin Elasticity: Finger pad Friction against Textured Surfaces

The static friction behaviour of skin with relevance to pressure ulcer prevalence

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