1. Laboratory for Bioinspired, Bionic, Nano, Meta Materials and Mechanics, Department of Civil, Environmental and Mechanical Engineering, University of Trento, Trento 38122, Italy
2. Laboratory of Bioinspired Soft Robotics, Center for Convergent Technologies, Istituto Italiano di Tecnologia, Genova 16163, Italy
3. Department of Structural and Geotechnical Engineering, Sapienza University of Rome, Rome 00184, Italy
4. School of Engineering and Materials Science, Queen Mary University of London, London E1 4NS, UK