Abstract
Soft robotics is an expanding area of research which exploits compliance and adaptability of soft structures to design highly adaptive robots for contact interactions. The ability to 3D-print materials with softer, more elastic materials properties is a recent development and a key enabling technology for the rapid development of soft robots. Among the possible applications, soft cooperative grippers and manipulators have demonstrated a high potential impact. However, retrieving data about mechanical properties of such novel soft materials and information about the parameters to select in the 3D-printers is often not straightforward. The aim of this chapter is to systematically investigate the mechanical properties of 3D-printed specimens from one of the most used soft filament, the Ninjaflex (Lulzbot, USA). In particular, we focus on the characterization of bending stiffness with reference to the selection of different infill density and printing patterns. We also report on how the collected data can be used in the design phase to obtain a desired behaviour of a soft gripper and on repeatability of the 3D-printing process. Finally, we tested with a finger of a cooperative gripper how the different approaches to obtain a given stiffness value affect the flexion/extension trajectory. This work is intended to be a useful tool for researchers who use rapid-prototyping techniques to develop soft grippers and it also serves as a possible guideline to the characterization of the mechanical properties of novel soft filaments.
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References
Dollar, A.M., Howe, R.D.: The highly adaptive SDM hand: design and performance evaluation. Int. J. Robot. Res. 29(5), 585–597 (2010)
Grioli, G., Catalano, M., Silvestro, E., Tono, S., Bicchi, A.: Adaptive synergies: an approach to the design of under-actuated robotic hands. In: 2012 IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS), pp. 1251–1256. IEEE (2012)
Deimel, R., Brock, O.: A compliant hand based on a novel pneumatic actuator. In: 2013 IEEE International Conference on Robotics and Automation (ICRA), pp. 2047–2053. IEEE (2013)
Wang, Z., Torigoe, Y., Hirai, S.: A prestressed soft gripper: design, modeling, fabrication, and tests for food handling. IEEE Robot. Autom. Lett. 2(4), 1909–1916 (2017)
Davidson, J.R., Mo, C.: Mechanical design and initial performance testing of an apple-picking end-effector. In: ASME International Mechanical Engineering Congress and Exposition (IMECE), pp. 13–19 (2015)
Salvietti, G., Iqbal, Z., Hussain, I., Prattichizzo, D., Malvezzi, M.: The co-gripper: a wireless cooperative gripper for safe human robot interaction. In: Proceedings of IEEE/RSJ International Conference on Intelligent Robots and Systems, Madrid, Spain, pp. 4576–4581 (2018)
Majidi, C.: Soft robotics: a perspective-current trends and prospects for the future. Soft Robot. 1(1), 5–11 (2014)
Lipson, H., Kurman, M.: Fabricated: The New World of 3D Printing. Wiley, New York (2013)
Gao, W., Zhang, Y., Ramanujan, D., Ramani, K., Chen, Y., Williams, C.B., Wang, C.C., Shin, Y.C., Zhang, S., Zavattieri, P.D.: The status, challenges, and future of additive manufacturing in engineering. Comput. Aided Des. 69, 65–89 (2015)
Truby, R.L., Lewis, J.A.: Printing soft matter in three dimensions. Nature 540, 371 (2016)
Mutlu, R., Alici, G., in het Panhuis, M., Spinks, G.M.: 3D printed flexure hinges for soft monolithic prosthetic fingers. Soft Robot. 3(3), 120–133 (2016)
Hussain, I., Salvietti, G., Malvezzi, M., Prattichizzo, D.: On the role of stiffness design for fingertip trajectories of underactuated modular soft hands. In: 2017 IEEE International Conference on Robotics and Automation (ICRA), pp. 3096–3101. IEEE (2017)
Salvietti, G., Hussain, I., Malvezzi, M., Prattichizzo, D.: Design of the passive joints of underactuated modular soft hands for fingertip trajectory tracking. IEEE Robot. Autom. Lett. 2(4), 2008–2015 (2017)
Ninjaflex® the market leading flexible filament. https://ninjatek.com/products/filaments/ninjaflex/. Accessed 06 Sept 2017
Saari, M., Galla, M., Cox, B., Krueger, P., Cohen, A., Richer, E.: Additive manufacturing of soft and composite parts from thermoplastic elastomers. In: Solid Freeform Fabrication Symposium, pp. 949–958. University of Texas at Austin, Austin (2015)
Yarwindran, M., Azwani Sa’aban, N., Ibrahim, M., Periyasamy, R.: Thermoplastic elastomer infill pattern impact on mechanical properties 3d printed customized orthotic insole. ARPN J. Eng. Appl. Sci. 11(10), 6519–6524 (2016)
Wang, Z., Chathuranga, D.S., Hirai, S.: 3d printed soft gripper for automatic lunch box packing. In: 2016 IEEE International Conference on Robotics and Biomimetics (ROBIO), pp. 503–508. IEEE (2016)
Odhner, L.U., Dollar, A.M.: The smooth curvature model: an efficient representation of Euler-Bernoulli flexures as robot joints. IEEE Trans. Robot. 28(4), 761–772 (2012)
Plastics—Determination of tensile properties—Part 1: General principles. International Organization for Standardization, Geneva, March 2012
LulzBot TAZ 5. https://www.lulzbot.com/store/printers/lulzbot-taz-5. Accessed 06 Sept 2017
Slic3r, g-code generator for 3d printers. http://slic3r.org/. Accessed 06 Sept 2017
Chaudhry, S., Al-Dojayli, M., Czekanski, A.: Performance of 3-d printed thermoplastic polyurethane under quasi-static and high-strain rate loading. In: ASME 2016 International Mechanical Engineering Congress and Exposition, pp. V009T12A065–V009T12A065. American Society of Mechanical Engineers (2016)
Salvietti, G., Iqbal, Z., Malvezzi, M., Eslami, T., Prattichizzo, D.: Soft hands with embodied constraints: the soft ScoopGripper. In: Proceedings of IEEE International Conference on Robotics and Automation, Montreal, Canada, May 2019
Acknowledgement
The research leading to these results has received funding from the EU Horizon 2020/2015 project No 688857 “SOFTPRO”.
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Hussain, I., Iqbal, Z., Malvezzi, M., Prattichizzo, D., Salvietti, G. (2020). How to 3D-Print Compliant Joints with a Selected Stiffness for Cooperative Underactuated Soft Grippers. In: Ferraguti, F., Villani, V., Sabattini, L., Bonfè, M. (eds) Human-Friendly Robotics 2019. HFR 2019. Springer Proceedings in Advanced Robotics, vol 12. Springer, Cham. https://doi.org/10.1007/978-3-030-42026-0_11
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