Simplified simulation of impact bullet - stratified pack for restraining ballistic tests

Pîrvu, Cristian; Ionescu, Traian Florian; Deleanu, Lorena; Badea, Simona

doi:10.1051/matecconf/201711206023

Cited by 4 publications

(4 citation statements)

References 16 publications

(13 reference statements)

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“…The holes in layers 1 and 2 are similar, resulting that the process of yarn destruction is also similar, which argues that the perforation of the first two layers is made approximately with the same parameters (the velocity of the bullet through the first two layers is not significantly reduced and the shape of the bullet is not modified too much because it does not face yet the resistance of the other layers and it only cuts the yarns, as it is presented in a FE model in [11,14]. It is worth mentioning that the tests were carried out under conditions of a small variations in the initial bullet velocity (410-430 m/s).…”

Section: Failure Mechanisms Of Panels Yarns and Fibers By Sem And Mmentioning

confidence: 86%

“…Moreover, most non-armor application materials are chosen according to their bulk quasi-static properties, even though such properties do not always predict their ballistic performance. If the constitutive relations for properties characterizing new materials needed for running simulations are not known, then the engineer has to use information from the most similar existing material [11], making the result uncertain. This is another reason why armor designers do not consider using new-entry materials that have not yet been sufficiently characterized under particular dynamic conditions.…”

Section: Manufacturing and Testing The Flexible Panelsmentioning

confidence: 99%

“…In multilayered (stratified) systems, friction between layers is important in reducing damage [11]. All projectiles penetrating through a fabric, with semispherical, ogival, or conical shape, cause a splitting of the yarns [25].…”

Section: Failure Mechanisms Of Panels Yarns and Fibers By Sem And Mmentioning

confidence: 99%

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Ballistic Testing of Armor Panels Based on Aramid

Pîrvu¹,

Deleanu²

2019

Ballistics

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Industry and market of ballistic protection materials and systems are characterized by a dynamic and competing succession of inventions for projectiles and protective systems. The requirements for the ballistic panels are many and complex, varying depending on the threat type, the required mobility in the tactical theater, and protection level. The safety degree, the price, and the dynamics of research in the field are also taken into account. This chapter underlines the necessity of testing ballistic protection panels made of LFT SB1 plus (multidirectional fiber fabrics, supplied by Teijin) against a certain threat in order to assess their resistance to this specific threat and the investigation of failure mechanisms in order to improve their behavior at ballistic impact. The models for ballistic impact are useful when they are particularly formulated for resembling the actual system projectile, target, and can be validated through laboratory experiments. Tests made on panels made of LFT SB1plus, according to NIJ Standard-0101.06-2008 gave good results for the panels made of 12 layers of this fabric, and the backface signature (BFS) was measured. The BFS upper tolerance limit of 24,441 mm recommends this system for protection level IIA, according to the abovementioned standard.

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Section: Failure Mechanisms Of Panels Yarns and Fibers By Sem And Mmentioning

confidence: 86%

Section: Manufacturing and Testing The Flexible Panelsmentioning

confidence: 99%

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Ballistic Testing of Armor Panels Based on Aramid

Pîrvu¹,

Deleanu²

2019

Ballistics

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“…Aramid based ballistic panels were investigated in this study to ensure bullet protection and material integrity. The bullet action depends on the various layers of the aramid fiber materials [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Solution of Bullet Proof Wooden Frame Construction Panel with a Built-In Air Duct

et al. 2021

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The growing terrorism threats across the world play an important role in the design of civil buildings and living areas. The safety of personnel is a top priority in unclassified buildings, especially military buildings. However indoor air quality and thermal comfort has a direct impact on personal productivity and ability to concentrate on duties and affect the decision making in stress conditions. The use of wooden structures is becoming more common in the building construction, and application of wooden frame structures for the construction of new buildings as well as for retrofitting the existing buildings. Prefabricated wooded frame construction perfectly fits need of unclassified buildings, allowing significant reduction of construction time and integration of various active and passive elements, such as a fresh air supply duct. Within the scope of this paper a 12 mm thick ballistic panel made of aramid was tested. Ballistic panel, thermal conductivity, and fire resistance of wooded construction panel with embedded air duct were analyzed for the various modelled exterior wall solutions. The main advantage of the proposed technology is fast and qualitative modular construction of unclassified buildings, providing all modern requirements not only for safety, but also for the energy efficiency and indoor air quality. It was found that bullet proof aramid panels do not reduce overall fire safety in comparison to traditional construction materials. However embedded outdoor air supply ducts significantly reduces construction heat transfer coefficient.

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