Multistable Laminated Lattice Unit Cell Structure for Energy Absorption

Authors

  • Adnan Ahmed Department of Mechanical Engineering, American University of Sharjah, Sharjah, PO Box 26666, United Arab Emirates
  • Samir Emam Department of Mechanical Engineering, American University of Sharjah, Sharjah, PO Box 26666, United Arab Emirates

DOI:

https://doi.org/10.31181/rme551

Keywords:

Lattice Structure, Bistable Laminates, Impact Analysis, Auxetic Structures, FE Modeling

Abstract

Reconfigurable structures offer tunable mechanical response through easy switchability among their stable configurations. Bistable hybrid laminates have shown to be great candidates as constituent material in morphing structures offering two stable shapes for various boundary conditions. The bistability stems from the vastly different coefficients of thermal expansion upon cooling the laminate to the room temperature. A reconfigurable lattice structure exhibiting multiple stable shapes without the need of a holding force or continuous supply of energy would be extremely useful and desirable in certain applications. In this study, an innovative lattice unit cell structure made of hybrid bistable laminates is proposed to offer a tunable mechanical response and vastly different Poisson’s ratio among the different stable configurations when used as a repeating unit in a large lattice structure. A detailed FE model using ABAQUS® is presented which is used to analyze the multiple stable shapes of the unit cell and their mechanical response under impact loading. Each shape can be achieved easily through simple snap through processes yet exhibit substantial difference in energy absorption capability. This study explores a new area of research in designing laminated lattice structures which are tunable according to the desired application owing to multiple stable shapes.

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Published

2026-03-31

How to Cite

Multistable Laminated Lattice Unit Cell Structure for Energy Absorption. (2026). Reports in Mechanical Engineering, 7(1), 133-151. https://doi.org/10.31181/rme551