Effect of head shape on the adhesion capability of mushroom-like biological adhesive structures

Li, Guilin; Chang, Tienchong

doi:10.1016/s0894-9166(11)60033-5

“…5,24,25 In this section, a plane strain model is established as shown in Fig. 1, in which a mushroom-shaped fibril contacts adhesively with a rigid substrate with flange thickness h, shaft width d, adhesive contact length L and shaft angle q.…”

Section: The Adhesion Of a Mushroom-shaped Fibril And A Spatular Fibrilmentioning

confidence: 99%

“…Only a few studies based on fracture mechanics have been carried out to investigate the adhesion mechanisms of mushroom-shaped fibrils. 5,24,25 In this section, a plane strain model is established as shown in Fig. 1, in which a mushroom-shaped fibril contacts adhesively with a rigid substrate with flange thickness h, shaft width d, adhesive contact length L and shaft angle q.…”

Section: The Adhesion Of a Mushroom-shaped Fibril And A Spatular Fibrilmentioning

confidence: 99%

The effect of geometry on the adhesive behavior of bio-inspired fibrils

Peng

¹

,

Chen

²

2012

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Inspired by the special climbing ability of geckos and insects, the effects of geometry, including the endshape and size, on the adhesion features of bio-inspired fibrils, are investigated. It is found that, the adhesion force of a mushroom-shaped fibril in perfect contact with a rigid substrate decreases with the increase of the peeling angle, but it will increase with an increasing flange thickness at a determined peeling angle. With the same contact length, the mushroom-shaped fibril can achieve much larger adhesion forces than the cylindrical or spatular one due to a larger effective region of the cohesive zone. The effect of the shaft width of the mushroomed-shaped fibril on the adhesion force with and without interfacial defects is also considered, and the results are further compared qualitatively with the experimental ones. A critical contact length for the mushroom-shaped fibril is further found, above which the adhesion force attains a maximum. For a multi-fibril structure, the phenomenon of almost equal load sharing for each fibril is verified numerically, which is consistent with the existing experimental observation. All the results in this paper should be helpful for the understanding of the micro-adhesion mechanism of biological adhesive systems and the design of novel adhesives.

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“…This study focuses on evaluating the performances of two versions of the grid-point atmospheric model of the State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics (LASG, IAP) (GAMIL1.0, 2.0) using CAPT (Li et al, 2007;Li and Wang, 2010;Shi et al, 2010). A brief description of GAMIL and its experimental designs are presented in section 2.…”

Section: Introductionmentioning

confidence: 99%

Evaluating the Performances of GAMIL1.0 and GAMIL2.0 during TWPICE with CAPT

Li

¹

,

Xie

²

,

Wang

³

et al. 2012

Atmospheric and Oceanic Science Letters

12

0

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CAPT (Climate Change Prediction Program and Atmospheric Radiation Measurement Program (CCPP-ARM) Parameterization Testbed) has been a valuable tool to assess climate models in recent years, and the Tropical Warm Pool-International Cloud Experiment (TWP-ICE) has collected comprehensive measurements to verify its physical parameterizations. The present study evaluates the performances of the two GAMIL (grid-point atmospheric model of IAP LASG) versions during TWP-ICE using CAPT. The results indicate that GAMIL2.0 reproduced better shifts of clouds and rainfall during three distinct monsoon phases than GAMIL1.0, although both of them simulated the large-scale dynamical states well, which are mainly attributable to the different convective parameterizations.

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Effect of Geometry on the Adhesive Behavior of Bio-inspired Fibrils

Peng¹

2015

Springer Theses

0

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Inspired by the special climbing ability of geckos and insects, the effects of geometry, including the endshape and size, on the adhesion features of bio-inspired fibrils, are investigated. It is found that, the adhesion force of a mushroom-shaped fibril in perfect contact with a rigid substrate decreases with the increase of the peeling angle, but it will increase with an increasing flange thickness at a determined peeling angle. With the same contact length, the mushroom-shaped fibril can achieve much larger adhesion forces than the cylindrical or spatular one due to a larger effective region of the cohesive zone. The effect of the shaft width of the mushroomed-shaped fibril on the adhesion force with and without interfacial defects is also considered, and the results are further compared qualitatively with the experimental ones. A critical contact length for the mushroom-shaped fibril is further found, above which the adhesion force attains a maximum. For a multi-fibril structure, the phenomenon of almost equal load sharing for each fibril is verified numerically, which is consistent with the existing experimental observation. All the results in this paper should be helpful for the understanding of the micro-adhesion mechanism of biological adhesive systems and the design of novel adhesives.

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Effect of head shape on the adhesion capability of mushroom-like biological adhesive structures

Cited by 4 publications

References 39 publications

The effect of geometry on the adhesive behavior of bio-inspired fibrils

The effect of geometry on the adhesive behavior of bio-inspired fibrils

Evaluating the Performances of GAMIL1.0 and GAMIL2.0 during TWPICE with CAPT

Effect of Geometry on the Adhesive Behavior of Bio-inspired Fibrils

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