Pneumatically tunable adherence of elastomeric soft hollow pillars with non-circular contacts
Pneumatically tunable adherence of elastomeric soft hollow pillars with non-circular contacts
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DOI：
10.1016/j.ijsolstr.2024.112736
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发表时间：
2024-03
影响因子：
3.6
通讯作者：
Guangchao Wan;Wanliang Shan
中科院分区：
文献类型：
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作者：
Guangchao Wan;Wanliang Shan
动态可调界面干粘附在许多生物功能和工业应用中起着重要作用。在众多的策略中，化学活化的粘附装置由于其独特的优点而备受关注，例如速度快、性能可靠、粘附可调性大和材料容易获得。为了理解和预测的粘合剂活化的粘合剂的粘合强度，有必要检查它们的界面力学，这是非线性耦合的压力下的设备的大变形。然而，以前的研究只集中在轴对称的情况下，在接触区域的轮廓是圆形的，而可调的粘附非圆形接触控制的气动学仍然难以捉摸。在这项工作中，我们通过实验和模拟相结合，研究了非圆形接触几何形状对压力激活软空心柱可调干粘附的影响。具体而言，椭圆形，正方形和矩形的接触形状被认为是和它们的影响可调的软空心柱的粘附力相比，圆形接触几何形状彻底。结果表明，具有椭圆形、方形和矩形接触面的空心软支柱具有丰富的界面脱层行为，且与接触面的几何形状和内压有关。在所有接触几何形状中，椭圆形接触具有最高的粘附可调性，但由于接触轮廓的不均匀曲率分布而需要最低的激活压力。然而，当偏心率增加时，椭圆形接触具有由侧壁的相对侧在屈曲时的接触引起的粘附的降低的可调性。对于正方形和矩形接触，它们具有最低的粘附可调性，并且需要比圆形和椭圆形接触更高的激活压力，因为侧壁的90度边缘阻止了屈曲不稳定性。我们的研究结果大大拓宽了化学活化的粘合剂设备的设计空间，通过添加软空心柱的接触几何形状作为一个新的设计参数，这可以提供有价值的指导，可调粘合剂设计的各种应用在制造业和机器人。
Dynamically tunable interfacial dry adhesion plays a significant role in numerous biological functions and industrial applications. Among various strategies, pneumatics-activated adhesive devices draw much attention due to their distinct advantages such as fast speed, reliable performance, large adhesion tunability and easily accessible materials. To understand and predict adhesion strength of pneumatics-activated adhesives, it is necessary to examine their interfacial mechanics that is nonlinearly coupled with the large deformation of the devices under pressure. However, previous studies have only focused on axisymmetric cases in which the outline of the contact area is circular, whereas the tunable adherence of non-circular contact controlled by pneumatics remains elusive. In this work, through a combination of experiments and simulations, we study the effect of non-circular contact geometry on tunable dry adhesion of pressure-activated soft hollow pillars. Specifically, elliptical, square, and rectangular contact shapes are considered and their effects on tunable adhesion of the soft hollow pillars are compared to that of circular contact geometry thoroughly. The results show that soft hollow pillars with elliptical, square, and rectangular contact surfaces demonstrate rich interfacial delamination behaviors that depend on the contact outline geometry and internal pressure. Among all contact geometries, elliptical contact has the highest adhesion tunability yet requires lowest activating pressure owing to the non-uniform curvature distribution of the contact outline. However, when the eccentricity increases, the elliptical contact has reduced tunability of adhesion caused by the contact of opposing sides of the sidewall upon buckling. For square and rectangular contacts, they have the lowest adhesion tunability and need higher activating pressure than those of circular and elliptical contact since the 90-degree edges of the sidewall prohibit buckling instability. Our findings greatly broaden the design space of pneumatics-activated adhesive devices by adding the contact geometry of the soft hollow pillars as a new design parameter, which can provide valuable guidance for tunable adhesive design for various applications in manufacturing and robotics.