期刊
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
卷 151, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jmps.2021.104400
关键词
Simultaneous pressure/shear sensor; Mechanics-guided; deterministic 3D assembly; Soft encapsulation; Analytic model
资金
- China Scholarship Council [201806120080]
- National Natural Science Foundation of China [51790502]
- National Research Foundation of Korea (NRF) - Korea government (MSIP
- Ministry of Science, ICT AMP
- Future Planning) [2020R1G1A1101267]
- Nano Material Technology Development Program - Ministry of Science and ICT of Korea [2020M3H4A1A03084600]
- National Research Foundation of Korea [2020R1G1A1101267] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
A new sensor developed recently can decouple responses to pressure and shear stress, providing new possibilities for applications in fields such as artificial skin. Analysis of the mechanics of this sensor can provide guidance for optimization and design of these devices.
Flexible, large-area tactile sensors capable of simultaneously measuring in real time both the normal pressure and the tangential shear stress have many important applications, including those in artificial skin for uses in robotics, medicine and rehabilitation. Previously reported sensors exhibit responses to pressure and shear stress that are coupled, mainly due to nonlinearities, in ways that can be difficult to separate. A recently developed sensor based on techniques in mechanics-guided, deterministic three-dimensional (3D) assembly provides a route to decouple these responses such that the pressure and the shear stress can be determined explicitly and linearly from the change in resistance of multiple strain gauges integrated at carefully selected locations on the 3D structure. A clear understanding of the mechanics of this 3D structure-based sensor is essential for its optimization and application. Here analytic models, validated by finite element analysis, are presented for the deformation of such structures under pressure and shear stress. Analytic solutions in concise forms are derived for a buckled wavy ribbon encapsulated in a soft elastomer, which reveal the effect of the geometry and material parameters on the sensitivity, therefore establishing design guidelines for these devices.
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