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Mechanics Guided Soft Conductors, Sensors, and Robotics.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Mechanics Guided Soft Conductors, Sensors, and Robotics./
作者:	Wu, Shuang.
面頁冊數:	1 online resource (147 pages)
附註:	Source: Dissertations Abstracts International, Volume: 84-10, Section: B.
Contained By:	Dissertations Abstracts International84-10B.
標題:	Computer & video games. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=30364033click for full text (PQDT)
ISBN:	9798377682288

Mechanics Guided Soft Conductors, Sensors, and Robotics.
Wu, Shuang.

Mechanics Guided Soft Conductors, Sensors, and Robotics. - 1 online resource (147 pages)

Source: Dissertations Abstracts International, Volume: 84-10, Section: B.

Thesis (Ph.D.)--North Carolina State University, 2023.

Includes bibliographical references

Stretchable devices and soft robots have been attracting significant attention. The focus of this research is to harness mechanical design to improve the performance of stretchable conductors, sensors, and soft robots. First, we introduce a highly conductive and stretchable conductor with buckle-delamination structure. A partially delaminated wavy geometry of the polymer film is created, which effectively reduces the local strain in the silver nanowires. The resistance change of the conductor is less than 3% with the applied strain up to 100%. A theoretical model on the buckle-delamination structure is developed to predict the geometry evolution, which agreed well with experimental observation. Finally, an integrated silver nanowire/elastomer sensing module and a stretchable thermochromic device are demonstrated to illustrate the utility of the stretchable conductor. This work highlights the important relevance of mechanics-based design in nanomaterial-enabled stretchable conductors.For stretchable sensors, we report a soft stretchable strain sensor with an unusual combination of high sensitivity, large sensing range, and high robustness. Periodic mechanical cuts are applied to the top surface of the sensor, changing the current flow from uniformly across the sensor to along the conducting path defined by the open cracks. Both experiment and finite element analysis are conducted to study the effect of the cut depth, cut length, and pitch between the cuts. The stretchable strain sensor can be integrated into wearable systems for monitoring of physiological functions and body motions associated with different levels of strains, such as blood pressure and lower back health. A soft 3D touch sensor that tracks both normal and shear stresses is developed for human-machine interfaces and tactile sensing for robotics.For soft robots, we first introduce a bimorph thermal actuator that harnesses the snapthrough instability. The snap-through instability is enabled by simply applying an offset displacement to part of the actuator structure. The effects of thermal conductivity of the composite, offset displacement, and actuation frequency on the actuator speed are investigated using both experiments and finite element analysis. The actuator yields a bending speed as high as 28.7 cm-1 /s, 10 times that without the snap-through instability. A fast-crawling robot with locomotion speed of 1.04 body length per second and a biomimetic Venus flytrap were demonstrated to illustrate the promising potential of the fast bimorph thermal actuators for soft robotic applications. Secondly, we report a crawling robot that mimics the caterpillar locomotion with multiple crawling modes, controlled by joule heating of a patterned soft heater consisting of silver nanowire networks in a liquid crystal elastomer-based thermal bimorph actuator. With distributed heating pattern and switchable conducting channels, different temperature and curvature distribution are achieved, enabling bidirectional locomotion as a result of the adjustable friction competition between the front and rear end with the ground. The bidirectional actuation modes, the crawling speed, and the capability of passing through obstacles with limited space are investigated with experiments and finite element analyses. The strategy of patterned and distributed heating and actuation with thermal responsive materials offers new capabilities for smart and multifunctional soft robots.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2023

Mode of access: World Wide Web

ISBN: 9798377682288Subjects--Topical Terms:

3548317
Computer & video games.
Index Terms--Genre/Form:

542853
Electronic books.

Mechanics Guided Soft Conductors, Sensors, and Robotics.
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500 $a Source: Dissertations Abstracts International, Volume: 84-10, Section: B.
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502 $a Thesis (Ph.D.)--North Carolina State University, 2023.
504 $a Includes bibliographical references
520 $a Stretchable devices and soft robots have been attracting significant attention. The focus of this research is to harness mechanical design to improve the performance of stretchable conductors, sensors, and soft robots. First, we introduce a highly conductive and stretchable conductor with buckle-delamination structure. A partially delaminated wavy geometry of the polymer film is created, which effectively reduces the local strain in the silver nanowires. The resistance change of the conductor is less than 3% with the applied strain up to 100%. A theoretical model on the buckle-delamination structure is developed to predict the geometry evolution, which agreed well with experimental observation. Finally, an integrated silver nanowire/elastomer sensing module and a stretchable thermochromic device are demonstrated to illustrate the utility of the stretchable conductor. This work highlights the important relevance of mechanics-based design in nanomaterial-enabled stretchable conductors.For stretchable sensors, we report a soft stretchable strain sensor with an unusual combination of high sensitivity, large sensing range, and high robustness. Periodic mechanical cuts are applied to the top surface of the sensor, changing the current flow from uniformly across the sensor to along the conducting path defined by the open cracks. Both experiment and finite element analysis are conducted to study the effect of the cut depth, cut length, and pitch between the cuts. The stretchable strain sensor can be integrated into wearable systems for monitoring of physiological functions and body motions associated with different levels of strains, such as blood pressure and lower back health. A soft 3D touch sensor that tracks both normal and shear stresses is developed for human-machine interfaces and tactile sensing for robotics.For soft robots, we first introduce a bimorph thermal actuator that harnesses the snapthrough instability. The snap-through instability is enabled by simply applying an offset displacement to part of the actuator structure. The effects of thermal conductivity of the composite, offset displacement, and actuation frequency on the actuator speed are investigated using both experiments and finite element analysis. The actuator yields a bending speed as high as 28.7 cm-1 /s, 10 times that without the snap-through instability. A fast-crawling robot with locomotion speed of 1.04 body length per second and a biomimetic Venus flytrap were demonstrated to illustrate the promising potential of the fast bimorph thermal actuators for soft robotic applications. Secondly, we report a crawling robot that mimics the caterpillar locomotion with multiple crawling modes, controlled by joule heating of a patterned soft heater consisting of silver nanowire networks in a liquid crystal elastomer-based thermal bimorph actuator. With distributed heating pattern and switchable conducting channels, different temperature and curvature distribution are achieved, enabling bidirectional locomotion as a result of the adjustable friction competition between the front and rear end with the ground. The bidirectional actuation modes, the crawling speed, and the capability of passing through obstacles with limited space are investigated with experiments and finite element analyses. The strategy of patterned and distributed heating and actuation with thermal responsive materials offers new capabilities for smart and multifunctional soft robots.
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