MechE PhD Prospectus Defense - Yi Yang

  • Starts: 2:00 pm on Wednesday, November 28, 2018
  • Ends: 4:00 pm on Wednesday, November 28, 2018
TITLE: SHAPE-SHIFTING KIRIGAMI ARCHITECTURE FOR ADVANCED FUNCTIONALITY. COMMITTEE: Prof. Douglas Holmes (ME/MSE ) (Advisor) Prof. Harold Park (ME/MSE) Prof. Tommaso Ranzani (ME) Prof. David Campbell (Physics/ECE/MSE) ABSTRACT: Programmable and reconfigurable materials are desired for their engineering applications in shape- shifting structures, artificial muscles, and soft robotic actuators. Recent efforts on reconfigurable mechanical metamaterials have paved a new path. The mechanical properties of these architected materials depend on the topology and geometry of the substructure, and are typically independent of the constituent’s chemical composition. By introducing controllable morphological structures into the unit cell level, reprogrammable and reconfigurable metamaterials can be achieved. Among various types of architected materials, architectures inspired by a paper cutting technique, kirigami, attracted tremendous attention due to its robust and straightforward ability to transform 2D pre- cursors into 3D architectures. In this prospectus, through a combination of experiments, theoret- ical analysis, and simulations, a novel shape-shifting kirigami architecture with multistability was developed. Based on this kirigami architecture, design and fabrication of tunable mechanical meta- materials and soft robotics will be investigated. The dissertation will be composed of two main parts. In the first part, by changing the spacing between the adjacent slits in the conventional linear parallel kirigami cutting patterns, we obtain multistable kirigami architecture composed of repeating unit cells whose structure is energetically metastable with two local minima, thereby endowing it with a snap–through mechanism. Each local stable state is associated with a corresponding structural configuration which can be switched rapidly and reversibly by an external perturbation. An analytical mechanics model was developed to understand the underlying physics of the geometry dominated multistability. As the first part of the dissertation serves as the fundamentals and a novel approach, the second part aims to investigate the potential engineering applications as artificial muscle, untethered ultra-light soft robotics, and architected materials with encoded memories. In summary, this work seeks to provide a platform as a reconfigurable and reprogrammbale mechanism and would be applied in multifunctional materials, soft robotics, and biomedicine.
Location:
110 Cummington Mall, Room ENG 245

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