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Possibilities of vacuum packed particles application in blast mitigation seats in military armored vehicles

Dominik Rodak Mateusz Żurawski Michał Gmitrzuk Lech Starczewski
Bulletin of the Polish Academy of Sciences Technical Sciences | 2022 | 70 | 1 | e138238 | DOI: 10.24425/bpasts.2021.138238
Keywords blast mitigation seat STANAG 4569 drop-test vacuum packed particles
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Abstract

Blast mitigation continues to be a popular field of research when military vehicles are concerned. The main problem is coping with the vehicle global motion consequences following an explosion. The paper presents a potential application of the linear vacuum packed particle (VPP) damper as a supplementation for a viscous shock absorber in a traditional blast mitigation seat design. The paper also presents field test results for the underbelly blast explosion, comparing them to the laboratory tests carried out on the impact bench. To collect accelerations, the anthropomorphic test device, i.e. the Hybrid III dummy, was used. A set of numerical simulations of the modified blast mitigation seat with the additional VPP linear damper were revealed. The VPP damper was modeled according to the Johnson–Cook model of viscoplasticity. The Hertzian contact theory was adopted to model the contact between the vehicle and the ground. The reduction of the dynamic response index (DRI) in the case of the VPP damper application was also proved.
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Authors and Affiliations

Dominik Rodak
1
ORCID: ORCID
Mateusz Żurawski
1
ORCID: ORCID
Michał Gmitrzuk
2
ORCID: ORCID
Lech Starczewski
2
  1. Faculty of Automotive and Construction Machinery Engineering, Warsaw University of Technology, Poland
  2. Military Institute of Armoured and Automotive Technology, Poland

Mitigation of Blast Load Risk on Reinforced Concrete Structures Considering Different Design Alternatives

Y.E. Ibrahim M. Almustafa
Archives of Civil Engineering | Vol. 66 | No 3 | 225-238 | DOI: 10.24425/ace.2020.134394
Keywords Blast loading RC frame structure blast mitigation composite column
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Abstract

The purpose of this study is to investigate a structure’s response to blast loading when composite columns are used instead of conventional reinforced concrete (RC) cross sections and when a conventional structure is retrofitted with braces. The study includes conducting dynamic analyses on three different structures: a conventional reference RC structure, a modified structure utilizing composite columns, and a modified structure retrofitted with steel braces. The two modified structures were designed in order to investigate their performance when subjected to blast loading compared to the conventional design. During the dynamic analyses, the structures were exposed to simulated blast loads of multiple intensities using the finite-element modelling software, SeismoStruct. To evaluate their performance, the responses of the modified structures were analyzed and compared with the response of the conventional structure. It was concluded that both the structure with composite columns and the steel brace structure experienced less damage than the conventional model. The best performance was obtained through the steel brace structure.

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Authors and Affiliations

Y.E. Ibrahim
M. Almustafa

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