A semi-analytical model elaborates the effect of cohesive zone on the peeling behaviors of heterogeneous thin films

IF 5.7 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures Pub Date : 2025-04-22 DOI:10.1016/j.tws.2025.113357

Bingzhan Zhu , Kun Geng , Hao Li , Zuoqi Zhang

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Abstract

Film-substrate systems are prevalent in various industries, and manipulation of their adhesion strength is essential to guarantee their desired functionalities. Inspired by the heterogeneous characteristic of geckos’ spatulae, heterogeneous adhesion devices are proposed for enhanced directional adhesion, but experimental measurements of their adhesion strength are significantly lower than the theoretical predictions. This discrepancy is likely due to the cohesive zone, a factor that was usually overlooked in previous theoretical models. To elucidate the effects of the cohesive zone on the peeling behavior of bio-inspired heterogeneous thin films, we developed a semi-analytical model based on energy principles. In the model, the peeling force can be determined by two dimensionless parameters: the heterogeneity factor and the cohesive-zone factor. The heterogeneity factor significantly strengthens the adhesion when peeling from the soft side to the stiff side, and weakens the adhesion when peeling from the opposite direction. This indicates that heterogeneity simultaneously facilitates the attachment in soft-stiff direction and the detachment in stiff-soft direction. The cohesive-zone factor partially offsets the attachment enhancement by heterogeneity; however, the cohesive-zone factor has marginal impact on the detachment enhancement. This study systematically reveals the combined effects of heterogeneity and cohesive zone on the peeling behaviors of bio-inspired heterogeneous thin films and provides useful guidelines for the design of smart attachment/detachment adhesion systems.

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一个半解析模型阐述了内聚区对非均质薄膜剥离行为的影响

薄膜-衬底系统在各种工业中都很普遍，对其粘附强度的控制是保证其预期功能的必要条件。受壁虎刮刀非均质特性的启发，提出了增强定向粘附的非均质粘附装置，但其粘附强度的实验测量值明显低于理论预测值。这种差异很可能是由于内聚区，这是一个在以前的理论模型中通常被忽视的因素。为了阐明内聚区对仿生非均质薄膜剥离行为的影响，我们建立了一个基于能量原理的半解析模型。在该模型中，剥落力可由两个无量纲参数确定：非均质系数和粘结带系数。非均质性因素显著增强了从软侧向硬侧剥离时的粘附性，相反方向剥离时的粘附性减弱。这表明非均质性同时促进了软-硬方向的附着和硬-软方向的分离。黏结带因子部分抵消了异质性对附着力的增强；黏结带因子对分离增强的影响较小。本研究系统地揭示了非均质性和内聚区对仿生非均质薄膜剥离行为的综合影响，为智能附着/剥离粘附系统的设计提供了有用的指导。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Thin-Walled Structures 工程技术-工程：土木

CiteScore

9.60

自引率

20.30%

发文量

801

审稿时长

66 days

期刊介绍： Thin-walled structures comprises an important and growing proportion of engineering construction with areas of application becoming increasingly diverse, ranging from aircraft, bridges, ships and oil rigs to storage vessels, industrial buildings and warehouses. Many factors, including cost and weight economy, new materials and processes and the growth of powerful methods of analysis have contributed to this growth, and led to the need for a journal which concentrates specifically on structures in which problems arise due to the thinness of the walls. This field includes cold– formed sections, plate and shell structures, reinforced plastics structures and aluminium structures, and is of importance in many branches of engineering. The primary criterion for consideration of papers in Thin–Walled Structures is that they must be concerned with thin–walled structures or the basic problems inherent in thin–walled structures. Provided this criterion is satisfied no restriction is placed on the type of construction, material or field of application. Papers on theory, experiment, design, etc., are published and it is expected that many papers will contain aspects of all three.