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Monday, July 8 • 11:20 - 11:40
LOW VELOCITY IMPACT OF A RECOVERABLE MULTISTABLE MECHANICAL METAMATERIAL WITH NEGATIVE STIFFNESS ELEMENTS

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Materials and structures absorbing shock energy are crucial for diverse engineering applications. Conventional materials or structures absorb energy through material destruction or viscoelastic effect, resulting in systems that can be used only once or strongly rate-dependent. Very recently, mechanical metamaterials have been designed in novel geometrics to achieve recoverable energy absorption in elastic systems, opening new avenue for mechanical dissipation of energy. However, numerical modeling of impact response of this mechanical materials is really scarce. Here we build a finite element method (FEM) model of a mechanical metamaterial with negative stiffness elements to simulate the quasi-static and low velocity impact behavior. Quasi-static simulation results agree well with experimental results reported in literature, and low velocity impact results indicate this mechanical metamaterial with multistable negative stiffness elements is ideal for impact energy absorption. The methods and results are helpful for analyzing, designing, and manufacturing of mechanical metamaterials for energy absorption.

Moderators
EP

Elsa Piollet

Dr, Polytechnique Montréal
avatar for Mohammad Rafiee

Mohammad Rafiee

Postdoctoral Fellow, Polytechnique Montréal
Mohammad Rafiee received his Ph.D. degree in Mechanical Engineering from the University of Ottawa in 2018. Currently, he is a Postdoctoral Fellow at Polytechnique Montreal in Canada. His research interests are primarily focused on the development of advanced composite materials, smart... Read More →
AR

Annie Ross

Professor, Polytechnique Montreal

Authors

Monday July 8, 2019 11:20 - 11:40 EDT
St-Laurent 8
  T07 Struct. dyn. & nonlin. vib., RS02 Vibr & cntrl of nonlin mech syst