Cluster of the Kendall-type adhesive microcontacts as a simple model for load sharing in bioinspired fibrillar adhesives
Cluster of the Kendall-type adhesive microcontacts as a simple model for load sharing in bioinspired fibrillar adhesives
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DOI：
10.1007/s00419-019-01516-1
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发表时间：
2019-08
影响因子：
2.8
通讯作者：
I. Argatov;Qiang Li;V. Popov
中科院分区：
文献类型：
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作者：
I. Argatov;Qiang Li;V. Popov
将弹性基底模型化为横观各向同性弹性半空间，研究了多点粘附接触问题。假设在衬底和圆形刚性（即，不可变形）和无摩擦的微垫，它们相互连接，从而建立载荷分担。微接触相互作用的影响占在制定的分离标准，为每个单独的微接触。一些不同的渐近模型的情况下，稀释集群的微接触与他们的准确性测试对一个特殊的情况下，两点接触，其中的解析解是可用的。的拉脱力已估计和阵列尺寸和微接触间距的影响进行了研究。结果表明，微垫固定的灵活性，这是类似于在蘑菇形原纤维中观察到的，显着增加了拉脱力。所提出的方法的新奇是其能够分离多尺度接触问题中的不同效果，这使得人们能够区分为生物启发的纤维状粘合剂开发的不同数学模型。
The problem of multiple adhesive contact is considered for an elastic substrate modeled as a transversely isotropic elastic half-space. It is assumed that a large number of the Kendall-type microcontacts are formed between the substrate and circular rigid (i.e., nondeformable) and frictionless micropads, which are interconnected between themselves, thereby establishing a load sharing. The effect of microcontacts interaction is accounted for in the formulation of the detachment criterion for each individual microcontact. A number of different asymptotic models are presented for the case of dilute clusters of microcontacts with their accuracy tested against a special case of two-spot contact, for which an analytical solution is available. The pull-off force has been estimated and the effects of the array size and the microcontact spacing are studied. It is shown that the flexibility of the micropads fixation, which is similar to that observed in mushroom-shaped fibrils, significantly increases the pull-off force. The novelty of the presented approach is its ability to separate different effects in the multi-scale contact problem, which allows one to distinguish between different mathematical models developed for bioinspired fibrillar adhesives.