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The role of initial speed in projectile impacts into light granular media

Title data

Huang, Kai ; Hernández-Delfin, Dariel ; Rech, Felix ; Dichtl, Valentin ; Hidalgo, Raúl Cruz:
The role of initial speed in projectile impacts into light granular media.
In: Scientific Reports. Vol. 10 (2020) Issue 1 . - No. 3207.
ISSN 2045-2322
DOI: https://doi.org/10.1038/s41598-020-59950-z

Official URL: Volltext

Project information

Project title:
Project's official titleProject's id
Open Access PublizierenNo information

Project financing: Deutsche Forschungsgemeinschaft

Abstract in another language

Projectile impact into a light granular material composed of expanded polypropylene (EPP) particles is investigated systematically with various impact velocities. Experimentally, the trajectory of an intruder moving inside the granular material is monitored with a recently developed non-invasive microwave radar system. Numerically, discrete element simulations together with coarse-graining techniques are employed to address both dynamics of the intruder and response of the granular bed. Our experimental and numerical results of the intruder dynamics agree with each other quantitatively and are in congruent with existing phenomenological model on granular drag. Stepping further, we explore the ‘microscopic’ origin of granular drag through characterizing the response of granular bed, including density, velocity and kinetic stress fields at the mean-field level. In addition, we find that the dynamics of cavity collapse behind the intruder changes significantly when increasing the initial speed . Moreover, the kinetic pressure ahead of the intruder decays exponentially in the co-moving system of the intruder. Its scaling gives rise to a characteristic length scale, which is in the order of intruder size. This finding is in perfect agreement with the long-scale inertial dissipation type that we find in all cases.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: Condensed-matter physics; Fluid dynamics; Statistical physics; thermodynamics and nonlinear dynamics
Institutions of the University: Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Experimental Physics V
Faculties
Faculties > Faculty of Mathematics, Physics und Computer Science
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 530 Physics
Date Deposited: 10 Apr 2021 21:00
Last Modified: 12 Apr 2021 05:47
URI: https://eref.uni-bayreuth.de/id/eprint/64683