Numerical investigation on ballistic resistance of aluminium multi-layered panels impacted by improvised projectiles

Szymczyk, Michał; Sumelka, Wojciech; Łodygowski, Tomasz

doi:10.1007/s00419-017-1247-8

Cited by 13 publications

(3 citation statements)

References 40 publications

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“…The limitation of this proposed UGAD is the lack of full scale experimental validation that is the aim of the authors for future research-nonetheless the presented virtual designing bases on the comprehensive experimental study in [72,73,74]. In addition, the production of “aluminium” cores requires slow and costly metal 3D printing.…”

Section: Ugad Applicationsmentioning

confidence: 99%

The Development of a New Shock Absorbing Uniaxial Graded Auxetic Damper (UGAD)

Al-Rifaie

Sumelka

2019

Materials

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Auxetic structures are efficient cellular materials that can absorb blast/impact energy through plastic deformation, thus protecting the structure. They are developing sacrificial solutions with light weight, high specific strength, high specific toughness and excellent energy dissipating properties, due to its negative Poison’s ratio nature. The use of auxetic and non-auxetic panels in blast resistant structures had been relatively perceived by researchers. Nonetheless, implementation of those energy dissipaters, explicitly as a uni-axial passive damper is restrained to limited studies, which highlight the potential need for further explorations. The aim of this paper is the design of a new uniaxial graded auxetic damper (UGAD) that can be used as a blast/impact/shock absorber in different scales for different structural applications. First, the geometry, material, numerical model and loading are introduced. Then, a detailed parametric study is conducted to achieve the most efficient graded auxetic system. Moreover, the designed auxetic damper is numerically tested and its static and dynamic constitutive relations are derived and validated analytically. The selection of optimum parameters was based on the ratio of the reaction force to the applied load (RFd/P) and plastic dissipation energy (PDE). The final designed UGAD contains three auxetic cores that have the same geometry, material grade (6063-T4), size and number of layers equal to eight. The cell-wall thickness t of the three auxetic cores is 1.4 mm, 1.8 mm and 2.2 mm, respectively; composing a graded auxetic system. The performance of the three auxetic cores together have led to a wide plateau region (80% of total crushing strain) and variant strength range (1–10 MPa), which in return, can justify the superior performance of the UGAD under different blast levels. Finally, the 3D printed prototype of the UGAD is presented and the possible applications are covered.

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Section: Ugad Applicationsmentioning

confidence: 99%

The Development of a New Shock Absorbing Uniaxial Graded Auxetic Damper (UGAD)

Al-Rifaie

Sumelka

2019

Materials

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“…The optimum ratio obtained was in a range of 1-3 to use the areal density of the composite efficiently. Szymczyk et al (2018) performed numerical simulations on the ballistic perforation of multilayered targets against improvised projectiles. For the shape of the target, the use of a V-shaped panel was found to have the best strength-to-weight ratio as compared to U-shaped, arc shaped and rectangular shared profile.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of superior layer configuration of titanium Ti-6Al-4V and aluminium 2024-T3 against soft projectiles

Senthil

Sharma

Rupali

et al. 2021

International Journal of Protective Structures

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The manuscript is focussed on the prediction of superior layer configuration on titanium and aluminium plates through numerical investigations using ABAQUS/Explicit finite element software. The target plate of titanium Ti-6Al-4V (Ti) and aluminium Al 2024-T3 (Al) were studied against 7.62 mm diameter soft lead core projectiles. The Johnson-Cook (JC) material model was employed to simulate the behaviour of the target as well as projectile material. The results thus predicted from the numerical simulations in terms of deformed profile, residual velocity and ballistic limit were compared with the experimental results available in literature. Overall, the results were found in good agreement with the experimental results. The simulations were performed on the target of 10, 12.7 and 15 mm thickness with three, five and ten layers in order to predict the superior layer configuration. In the case of Ti-6Al-4V, the difference in performance between three layers and monolithic was quite high, however the use of five or ten layers of equivalent thickness is not advisable as performance is reduced. For Al2024-T3, the performance of layer targets was quite similar to that of monolithic targets. It is also observed the resistance of TiTiAl target configuration found to be better as compared to AlTiTi target configuration. It is concluded that the Al plate as back layer has more efficiency for ballistic resistance of layered configuration. It is also concluded that with respect to thickness, the capacity of titanium target is approximately 1.5 times higher than aluminium target against given lead core projectile.

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“…The charge was uncased with no additional loading from fragmentation (for more information about fragmentation, refer to Szymczyk et al [34].…”

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confidence: 99%

Improving the Blast Resistance of Large Steel Gates—Numerical Study

Al-Rifaie

Sumelka

2020

Materials

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Blast resistant gates/doors are essential for sensitive infrastructure, such as embassies, ministries, or parliaments. Lightweight gates equipped with ‘energy absorbing systems’ have better operational performance than the traditional costly and bulky design. Graded auxetic structures have not yet been used as potential passive damping systems in the supporting frame of blast resistant gates. Consequently, this study tries to test if a uniaxial graded auxetic damper (UGAD) proposed by the authors in a recent article, namely the development of a new shock absorbing UGAD, could maintain a 3000 mm × 4500 mm steel gate operable after high blast peak reflected overpressure of 6.6 MPa, from 100 kg TNT at 5 m stand-off distance. The blast-induced response of the gate was assessed, with and without the proposed UGAD, using Abaqus/Explicit solver. Results showed that the attachment of the proposed UGAD to the gate led to a dramatic decrease in permanent deformations (a critical factor for gate operability after a blast event). Hence, a lighter, more economical gate (with 50% reduction in mass) was required to satisfy the operability condition. In addition, 49% of peak reaction forces were diminished, that have a direct impact on the supporting frame. Moreover, the results revealed that, in the numerical model, 56% of the achieved plastic dissipation energy was from the UGADs, and 44% from the gate. The outcomes of this research may have a positive impact on other sectors beyond academia, such as industry, economy, and public safety.

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Numerical investigation on ballistic resistance of aluminium multi-layered panels impacted by improvised projectiles

Cited by 13 publications

References 40 publications

The Development of a New Shock Absorbing Uniaxial Graded Auxetic Damper (UGAD)

The Development of a New Shock Absorbing Uniaxial Graded Auxetic Damper (UGAD)

Evaluation of superior layer configuration of titanium Ti-6Al-4V and aluminium 2024-T3 against soft projectiles

Improving the Blast Resistance of Large Steel Gates—Numerical Study

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