Tunable and reversible dry adhesion possess great potential in a wide range of applications including transfer printing, climbing robots, wearable devices/electronics, and gripping in pick-and-place operations. Multiferroic composite materials offer new routines and approaches to achieve tunable adhesion due to their multi-field coupling effects. In this paper, the classical Johnson-Kendall-Roberts (JKR) adhesion model is extended to investigate the adhesive contact problem of a multiferroic composite half-space indented by an axisymmetric power-law shaped punch, whose shape index is denoted by . The JKR- adhesion models under the action of the power-law shaped punches with four different electromagnetic properties are set up by means of the total energy method. The explicit analytical expressions relating the indentation load and indentation depth to the contact radius are obtained, which can include the existing results in open literature as special cases. The generalized Tabor parameter and the interfacial adhesion strength applicable to multiferroic composite materials are defined. The effects of the shape index and the electromagnetic loadings on adhesion behaviors are revealed. It is found that both of them have prominent influences on the relationships among the indentation load, indentation depth and contact radius, the contact radius and indentation depth at self-equilibrium state, and the critical contact radius and indentation depth at pull-off moment. The pull-off force under the action of the conducting spherical punch subjected to non-zero electromagnetic loadings is dependent on material properties, which is different from the classical JKR result. More importantly, our analysis indicates that the pull-off force and the interfacial adhesion strength can be adjusted via altering the electromagnetic loadings and the shape index of the punch, which provides new approaches to achieve tunable adhesion.

中文翻译：

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通过电磁载荷和冲头形状效应调节多铁复合材料的粘合强度


可调节和可逆的干粘附在广泛的应用中具有巨大的潜力，包括转移印刷、攀爬机器人、可穿戴设备/电子产品以及拾放操作中的抓取。多铁复合材料由于其多场耦合效应，提供了实现可调粘附力的新程序和方法。本文将经典的Johnson-Kendall-Roberts (JKR)粘附模型推广到研究轴对称幂律形状冲头压入的多铁性复合材料半空间的粘附接触问题，其形状指数用 表示。采用总能量法建立了具有四种不同电磁特性的幂律形冲头作用下的JKR-粘附模型。获得了压痕载荷和压痕深度与接触半径相关的显式解析表达式，其中可以包括作为特例的公开文献中的现有结果。定义了适用于多铁复合材料的广义Tabor参数和界面粘合强度。揭示了形状指数和电磁载荷对粘附行为的影响。研究发现，两者对压痕载荷、压痕深度与接触半径、自平衡状态下的接触半径与压痕深度、拉脱力矩时的临界接触半径与压痕深度之间的关系有显着影响。在非零电磁载荷作用下，导电球形冲头作用下的拉脱力取决于材料特性，这与经典的 JKR 结果不同。 更重要的是，我们的分析表明，可以通过改变电磁载荷和冲头的形状指数来调整拉脱力和界面粘合强度，这提供了实现可调粘合力的新方法。