Smart Materials in Robotics and Microtechnology

Objectifs du cours

Different stimuli cause some materials called "active", "smart" or "intelligent" to respond with a change in shape and/or in length. The output strain can then be used to introduce motion or dynamics into a system. Depending on the stimulus-response-direction an active material can be used as both actuator and sensor. The applied driving forces can be broadly classified into three categories: Electrical fields, thermal fields and magnetic fields. Common materials include electrostrictive and piezoelectric ceramics, shape memory alloys, magnetostrictive materials, and electrorheological/magnetorheological fluids. A new class of electroactive polymers (EAP) emerged and start to find new applications in robotics and microtechnology due to their unique properties such as extremely large actuation strains. The course aims to get a better understanding of the different active materials field and their application to robotics and microtechnology. The course will start by introducing the working principles of the different smart materials. The different manufacturing methods and the best technologies to shape them to desired dimensions will then be covered. A comparison of the different active materials will be discussed revealing the advantages and limitations of each technology. Finally illustrative applications of the active materials will be presented. Part of the course will be taught by investigating into details different case studies.

Public cible

The course is structured to appeal to a wide range of R&D staff and engineers from companies as well as research institutes active in the design, development, and testing of new structures and devices.

Contenu

• Classification of active materials
• The Materials: The applied driving forces: electrical, thermal, and magnetic fields
• Working principles of the different active materials (piezoelectric materials, electroactive polymers, magnetorheological/electrorheological fluids, shape memory alloys and magnetostrictive alloys).
• Manufacturing processes specially adapted to each material.
• Comparison between the different smart materials in terms of forces, strain, bandwidth,... and clearly identifying the advantages and drawbacks of each technology.
• Applications to robotics and microtechnology.
• Case studies

Enseignant(s)

Dr Moustapha Hafez is a Director of Research at CEA LIST, Fontenay aux Roses, France. M. Hafez is leading the Sensory and Ambient Interfaces Laboratory. He is also part time Professor rat Ecole Polytechnique, Palaiseau in the Mechanical Engineering Department where he is in charge of the courses: Active materials, and Robotics course. His research interests lie in the field of tactile technology, haptics, mechatronics and smart materials He is the co-inventor of more than 20 patents and has co-authored more than 100 publications in International journals and conferences.