Decorated granular layers for impact decimation

Tiwari, M. D.; Mohan, T. R. Krishna; Sen, Surajit

doi:10.1007/s10035-016-0652-y

Cited by 5 publications

(2 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…1 shows the schematic of a recently proposed two dimensional granular arrangement (Tiwari M. et al, 2016) for impact decimation, wherein, spherical granular particles are assembled in a block-type arrangement. The spheres in a block are of equal masses and have the same material properties.…”

Section: Model and Numerical Methodsmentioning

confidence: 99%

Impact Dispersion Using 2D and 3D Composite Granular Packing

Sen

Mohan

Tiwari

2017

KONA

Self Cite

View full text Add to dashboard Cite

We present a study of efficient dispersion of an impact onto structured and potentially scalable granular beds. We use discrete element method based dynamical simulations of shock wave propagation and dispersion in 2D and 3D arrangements of granular spheres. The spheres are geometrically packed in a nested columnar structure, which leads to the severe attenuation and spreading of the incident energy within the structure. We further show that by incorporating inhomogeneity in material properties, or by introducing layers of a dissimilar material in the middle of the arrangement, impact mitigation can be enhanced significantly. Such an arrangement can therefore be useful in the design of effective impact decimation systems. Using a 2D arrangement we first show the basic idea behind impact dispersion in such an arrangement. With this understanding the system is scaled to 3D. The influence of the system size and material properties on the wave propagation within the packing is also presented.

show abstract

Section: Model and Numerical Methodsmentioning

confidence: 99%

Impact Dispersion Using 2D and 3D Composite Granular Packing

Sen

Mohan

Tiwari

2017

KONA

Self Cite

View full text Add to dashboard Cite

show abstract

“…Impulse wave propagation is more attenuated in this quasi-one-dimensional (1D) tapered chain than the regular tapered chain. Ideas of stacking tapered granular chains into two-dimensional (2D) (Tiwari et al, 2016) and three-dimensional (3D) (Sen et al, 2017) space have been proposed recently. However, these studies on tapered granular structures in higher dimensions are limited to numerical investigation, and their experimental demonstration is yet elusive, mainly due to the challenges in their assembly.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear wave propagation in 3D-printed graded lattices of hollow elliptical cylinders

Kim

Yang

2019

Journal of the Mechanics and Physics of Solids

View full text Add to dashboard Cite

We propose a 3D-printed graded lattice made of hollow elliptical cylinders (HECs) as a new way to design impact mitigation systems. We observe asymmetric dynamics in the graded HEC chains with increasing and decreasing stiffness. Specifically, the increasing stiffness chain shows an acceleration of the propagating waves, while the decreasing stiffness chain shows the opposite. From the standpoint of impact mitigation, the decreasing stiffness chain combined with the strain-softening behavior of HECs results in an order-of-magnitude improvement in force attenuation compared to the increasing stiffness chain. We extend this finding to the graded 2D arrays and demonstrate a similar trend of wave transmission efficiency contrast between the increasing and decreasing stiffness lattices. The 3D-printed HEC lattices shown in this study can lead to the development of a new type of impact mitigating and shock absorbing structures.

show abstract