In‐Plane Combination of Micropillars with Distinct Aspect Ratios to Resist Overload‐Induced Adhesion Failure

Advanced Science, Journal Year: 2024, Volume and Issue: 11(28)

Published: May 8, 2024

Abstract Bioinspired micropillar adhesives have shown broad application prospects in space capture and docking, due to their strong adhesion, good environmental adaptability, reusability. However, when performing missions, unavoidable contact collision with target objects may cause large deformation of the micropillars, resulting loss adhesion ability. This study reports a novel adhesive through in‐plane combination micropillars (IPCM) different aspect ratios, consisting small pillars for retaining ones resisting overload‐induced failure. It is demonstrated that IPCM array can still maintain 85% peak after static compared general composed same pillars. The impact element size layout IPCM, as well detachment velocity on performance under high preload discussed. Furthermore, finite analysis qualitatively reproduces experimentally observed deformations attributes failure redistribution surface normal stress. Finally, potential dynamic objects. proposed opens up new design concepts practical applications bioinspired docking.

Language: Английский

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Reversible Microadhesives with Good Adhesion Anisotropy via Dual‐Gradient Modulus Constructing

Small, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 25, 2025

Abstract Bioinspired microadhesives can generate strong adhesion at the interface through van der Waals forces, demonstrating promising potential applications across various fields. However, inherent conflicts between microstructural stability and compliance, as well easy detachment, significantly hinder development practical of microadhesives. In this work, wedged (WMs) dual‐gradient modulus are fabricated via magnetically assisted soft‐molding. The WMs exhibit a maximum shear performance 4.9 N cm −2 minimum normal 0.13 under same preload, achieving an excellent anisotropy ratio (AR) up to 37.7. generates greater gradient difference, with low facilitating maintain well‐conformal contact, while high enhances detachment capabilities, which simultaneously improve long‐term stability. Additionally, quadruped gripping mechanism is designed exhibited stable grasping on‐demand rapid release when integrated WMs, anisotropic performance. provide valuable solution for designing that both structural along detachment. These findings will greatly benefit reversible in on‐orbit servicing technology.

Language: Английский

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Adhesive Mechanism of Polymer Patches with Densely Populated Convex and Concave Micropatterns in Dry and Wet Environments

Industrial & Engineering Chemistry Research, Journal Year: 2025, Volume and Issue: unknown

Published: March 31, 2025

Language: Английский

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Controlled Dry Adhesion of Bio-Inspired Fibrillar Polymers: Mechanics, Strategies, and Recent Advances

Materials, Journal Year: 2025, Volume and Issue: 18(7), P. 1620 - 1620

Published: April 2, 2025

Recent advancements in tunable adhesion technologies have broadened the scope of applications for bio-inspired fibrillar adhesives. This review highlights latest developments controlled mechanisms, with a focus on systems. We examine key theoretical foundations and progress controllable adhesion, including contact mechanics, splitting efficiency, fracture interplay between friction. Various factors influencing strength are discussed alongside optimization approaches innovative designs that enhance performance. The also covers recent research switchable strategies, an emphasis methods regulating surface contact, stress distribution, shear force control. Finally, we identify primary challenges future directions field, outlining areas require further exploration technological development. paper aims to provide comprehensive overview current offer insights guide evolving field technologies.

Language: Английский

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Role of viscoelasticity in the adhesion of mushroom-shaped pillars

Bioinspiration & Biomimetics, Journal Year: 2024, Volume and Issue: 19(6), P. 066006 - 066006

Published: Oct. 4, 2024

Abstract The contact behaviour of mushroom-shaped pillars has been extensively studied for their superior adhesive properties, often inspired by natural attachment systems observed in insects. Typically, are modeled with linear elastic materials the literature; reality, soft used fabrication exhibit a rate-dependent constitutive behaviour. Additionally, conventional models focus solely on detachment phase pillar, overlooking analysis phase. As result, they unable to estimate energy loss during complete loading-unloading cycle. This study investigates role viscoelasticity adhesion between pillar and rigid flat countersurface. Interactions at interface assumed be governed van der Waals forces, material is using standard solid model. Normal push release cycles simulated different approaching retracting speeds. Results reveal that, presence an interfacial defect, monotonically increasing trend pull-off force pulling speed observed. corresponding change pressure distribution suggests transition from short-range long-range adhesion, corroborating recent experimental theoretical investigations. Moreover, remains invariant loading history due our assumption flat–flat interface. Conversely, absence defects under parameters this study, occurs after reaching strength, found rate independent. Notably, hysteretic exhibits peak intermediate speeds, where viscous dissipation occurs, which holds true both defect. However, defect shifts region majority takes place.

Language: Английский

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Crack-Growth Inhibition by Designing Dendritic Pattern for Soft Adhesives

Extreme Mechanics Letters, Journal Year: 2024, Volume and Issue: unknown, P. 102254 - 102254

Published: Oct. 1, 2024

Language: Английский

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