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Abstract
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This study aims to introduce a novel hybrid design with a combination of two more common mechanisms for
improving the capacity of systems in absorbing the kinetic energy of moving vehicles or devices. This new model
consists of two individual mechanisms, i.e., expansion of a circular tube accompanied by crushing of an inner tube,
which dissipate the energy through friction, plastic deformations and failures of inner tube. This study comprises 24
case studies surveyed under two different design controls, constant mass and constant volume, for comparing purposes.
Finite element simulations are utilized so as to investigate models’ deformations and to extract some crashworthiness
parameters in aid of representing the efficiency of the mechanism as well as conducting a parametric study between
three different profiles of inner tube. This study shows that models with inner circular and hexagonal tube profile absorb
higher amount of energy due to experiencing three different modes of energy dissipation systems, including folding,
shear and ductile damages.
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