Temperature and strain rate effects of jammed granular systems: experiments and modelling

Abstract

Jammed granular systems, also known as vacuum packed particles (VPP), have begun to compete with the well commercialized group of smart structures already widely applied in various fields of industry, mainly in civil and mechanical engineering. However, the engineering applications of VPP are far ahead of the mathematical description of the complex mechanical mechanisms observed in these unconventional structures. As their wider commercialization is hindered by this gap, in the paper the authors consider experimental investigations of granular systems, mainly focusing on the mechanical responses that take place under various temperature and strain rate conditions. To capture the nonlinear behavior of jammed granular systems, a constitutive model constituting an extension of the Johnson–Cook model was developed and is presented. green The extended and modified constitutive model for VPP proposed in the paper could be implemented in the future into a commercial Finite Element Analysis code, making it possible to carry out fast and reliable numerical simulations.

Bulletin of the Polish Academy of Sciences: Technical Sciences

“…Due to the fact that the engineering applications of VPP are much ahead of their theoretical description. Work is undertaken on the mathematical description of complex mechanical mechanisms observed in these unconventional constructions [88].…”

Cyclic Loading of Jammed Granular Systems

“…A new alternative structure that can partially eliminate the problems mentioned is vacuum-packed particles (VPP) [ 8 , 9 ]. These are a composite that consists of polymer granulates inside a plastomer coating, whose property change is realized by granular jamming phenomena [ 10 ].…”

“…Some aspects, like the influence of vacuum pressure on the mechanical properties under uniaxial tension-compression or 3-point bending, have been described in detail in [ 9 , 12 ], respectively. Research that shows the change of mechanical properties under high strain rate and velocity are shown in the work [ 8 ]. The damping properties of a granular jamming mechanism were tested and described in the paper [ 21 ].…”