Kirigami skins make a simple soft actuator crawl

Highly stretchable kirigami flat sheets transform into 3D-textured surfaces and facilitate crawling. Bioinspired soft machines made of highly deformable materials are enabling a variety of innovative applications, yet their locomotion typically requires several actuators that are independently activated. We harnessed kirigami principles to significantly enhance the crawling capability of a soft actuator. We designed highly stretchable kirigami surfaces in which mechanical instabilities induce a transformation from flat sheets to 3D-textured surfaces akin to the scaled skin of snakes. First, we showed that this transformation was accompanied by a dramatic change in the frictional properties of the surfaces. Then, we demonstrated that, when wrapped around an extending soft actuator, the buckling-induced directional frictional properties of these surfaces enabled the system to efficiently crawl.

[1]  M Denny,et al.  Locomotion: The Cost of Gastropod Crawling , 1980, Science.

[2]  Stephen R. Forrest,et al.  Dynamic kirigami structures for integrated solar tracking , 2015, Nature Communications.

[3]  David L. Hu,et al.  Snakes move their scales to increase friction , 2016 .

[4]  Yoshinori Sawae,et al.  Effects of loading angles on stick–slip dynamics of soft sliders , 2016 .

[5]  Filip Ilievski,et al.  Multigait soft robot , 2011, Proceedings of the National Academy of Sciences.

[6]  D. Rus,et al.  Design, fabrication and control of soft robots , 2015, Nature.

[7]  T Umedachi,et al.  Softworms: the design and control of non-pneumatic, 3D-printed, deformable robots , 2016, Bioinspiration & biomimetics.

[8]  Koichi Suzumori,et al.  New pneumatic rubber actuators to assist colonoscope insertion , 2006, Proceedings 2006 IEEE International Conference on Robotics and Automation, 2006. ICRA 2006..

[9]  Kimberly L. Turner,et al.  Stick–slip friction of gecko-mimetic flaps on smooth and rough surfaces , 2015, Journal of The Royal Society Interface.

[10]  H Matthew Berns,et al.  Why arboreal snakes should not be cylindrical: body shape, incline and surface roughness have interactive effects on locomotion , 2015, Journal of Experimental Biology.

[11]  K. Bertoldi,et al.  Dielectric Elastomer Based “Grippers” for Soft Robotics , 2015, Advanced materials.

[12]  Hod Lipson,et al.  Soft material for soft actuators , 2017, Nature Communications.

[13]  V. Tsukruk,et al.  Nanoscale design of snake skin for reptation locomotions via friction anisotropy. , 1999, Journal of biomechanics.

[14]  R. Wood,et al.  Meshworm: A Peristaltic Soft Robot With Antagonistic Nickel Titanium Coil Actuators , 2013, IEEE/ASME Transactions on Mechatronics.

[15]  Tingyu Cheng,et al.  Fast-moving soft electronic fish , 2017, Science Advances.

[16]  C. Majidi.  Soft Robotics: A Perspective—Current Trends and Prospects for the Future , 2014 .

[17]  Jasmine A. Nirody,et al.  The mechanics of slithering locomotion , 2009, Proceedings of the National Academy of Sciences.

[18]  K. Bertoldi,et al.  Buckling-Induced Kirigami. , 2017, Physical review letters.

[19]  H. W. Lissmann.  Rectilinear Locomotion in a Snake ( Boa Occidentalis ) , 1950 .

[20]  David Berrigan,et al.  HOW MAGGOTS MOVE : ALLOMETRY AND KINEMATICS OF CRAWLING IN LARVAL DIPTERA , 1995 .

[21]  Fionnuala Connolly,et al.  Automatic design of fiber-reinforced soft actuators for trajectory matching , 2016, Proceedings of the National Academy of Sciences.

[22]  P. Polygerinos,et al.  Mechanical Programming of Soft Actuators by Varying Fiber Angle , 2015 .

[23]  P. Damasceno,et al.  A kirigami approach to engineering elasticity in nanocomposites through patterned defects. , 2015, Nature materials.

[24]  Cecilia Laschi,et al.  Soft robotics: a bioinspired evolution in robotics. , 2013, Trends in biotechnology.

[25]  Chen Li,et al.  Undulatory Swimming in Sand: Subsurface Locomotion of the Sandfish Lizard , 2009, Science.

[26]  MajidiCarmel,et al.  Soft Robotics: A Perspective—Current Trends and Prospects for the Future , 2014 .

[27]  Xuanhe Zhao,et al.  Hydraulic hydrogel actuators and robots optically and sonically camouflaged in water , 2017, Nature Communications.

[28]  Joey Z. Ge,et al.  An earthworm-inspired soft crawling robot controlled by friction , 2017, 2017 IEEE International Conference on Robotics and Biomimetics (ROBIO).

[29]  Shu Yang,et al.  Programmable Kiri‐Kirigami Metamaterials , 2017, Advanced materials.

[30]  I. Cohen,et al.  Stretchable surfaces with programmable 3D texture morphing for synthetic camouflaging skins , 2017, Science.

[31]  H. Bleckmann,et al.  Surface structure and frictional properties of the skin of the Amazon tree boa Corallus hortulanus (Squamata, Boidae) , 2009, Journal of Comparative Physiology A.

[32]  Ian D. Walker,et al.  Soft robotics: Biological inspiration, state of the art, and future research , 2008 .

[33]  R. McNeill Alexander,et al.  Principles of Animal Locomotion , 2002 .

[34]  Paolo Dario,et al.  Development of a biomimetic miniature robotic crawler , 2006, Auton. Robots.

[35]  Metin Sitti,et al.  Actively controlled fibrillar friction surfaces , 2015 .

[36]  Hisham A Abdel-aal,et al.  Tribological analysis of the ventral scale structure in a Python regius in relation to laser textured surfaces , 2013, 1305.4705.

[37]  K. Okumura,et al.  Initial rigid response and softening transition of highly stretchable kirigami sheet materials , 2016, Scientific Reports.

[38]  Samantha P. Roberts,et al.  Graphene kirigami , 2015, Nature.