MEchanics GAthering –MEGA- Seminar: Precision mechanisms with nonlinear load-deformation characteristics based on buckled beams

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Event details

Date 08.12.2022 16:1517:30  
Speaker Loïc Tissot-Daguette (Instant-Lab, EPFL)
Location Online
Category Conferences - Seminars
Event Language English
Abstract: Buckled beams have become key building blocks in flexure-based mechanisms to achieve nonlinear behaviors, such as bistability, constant-force and stiffness tuning. However, designing and modeling such components is challenging due to their highly nonlinear characteristics and existing models typically lack accuracy or rely on numerical computations. The aim of this research is to provide closed-form formulas to efficiently characterize the load-deformation behaviors and facilitate the design process of precision mechanisms based on buckled beams. A new generic analytical model for precompressed beams based on Euler–Bernoulli beam theory is presented and applied for rotationally actuated pinned–pinned and fixed–pinned buckled beams. Finite element and experimental validations are performed, showing excellent agreement with the model. Finally, we demonstrate the practicality of the studied building blocks and their modeling on a novel bistable gripper, a load cell with stiffness tuning, a constant-force surgical tool and a zero-force rectilinear translation flexure stage.

Bio: Loïc Tissot-Daguette received the M.Sc. degree in micro-engineering with a specialization in robotics, from the Swiss Federal Institute of Technology (EPFL), Lausanne, Switzerland, in 2019. Until 2022 he worked at Instant-Lab, EPFL, as a scientific assistant and he recently started his PhD. He is developing novel flexure-based mechanisms with nonlinear behaviors, such as constant-force, stiffness-tuning and bistable mechanisms.
 

Practical information

  • General public
  • Free

Organizer

  • MEGA.Seminar Organizing Committee

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