Impact of polyurea-coated metallic targets: Computational framework

Stergiou, Theodosios; Baxevanakis, Konstantinos P.; Roy, Anish; Sazhenkov, N.A.; Nikhamkin, Mikhail

doi:10.1016/j.compstruct.2021.113893

Cited by 16 publications

(7 citation statements)

References 46 publications

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“…During material deformation, the soft segments connected in the material allow the hard segments to remain covalently connected to each other. The viscous dissipation of polyurea occurs mainly in the soft segments, with energy dissipation occurring through chain movement [92]. Perturbation by straining amplifies the strain energy by the phase separation morphology of the material.…”

Section: Viscous Dissipation Within the Materials And Strain Rate Eff...mentioning

confidence: 99%

“…Polyurea has been found to sharply increase the ballistic limit of the underlying steel substrates, with one significant mechanism being the impact-induced rubber-to-glass state transition [14,121]. Recently, polyurea was found to cause reductions in the residual velocity of the projectiles and to increase the ballistic performance of metal plates [14,92,122]. Metal plates coated on the frontside showed a more pronounced increase in ballistic limit and specific energy absorption than the backside [14].…”

Section: Protection Of Metal Structuresmentioning

confidence: 99%

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Polyurea for Blast and Impact Protection: A Review

et al. 2022

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Polyurea has attracted extensive attention from researchers and engineers in the field of blast and impact protection due to its excellent quasi-static mechanical properties and dynamic mechanical properties. Its mechanical properties and energy absorption capacity have been tuned by means of formulation optimization, molecular dynamics (MD) simulation and the addition of reinforcing materials. Owing to the special molecular structure of polyurea, the mechanism of polyurea protection against blasts and impacts is the simultaneous effect of multiple properties. For different substrates and structures, polyurea needs to provide different performance characteristics, including adhesion, hardness, breaking elongation, etc., depending on the characteristics of the load to which it is subjected. The current article reviews relevant publications in the field of polyurea blast and impact protection, including material optimization, protection mechanisms and applications in blast and impact protection.

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Section: Viscous Dissipation Within the Materials And Strain Rate Eff...mentioning

confidence: 99%

Section: Protection Of Metal Structuresmentioning

confidence: 99%

Polyurea for Blast and Impact Protection: A Review

et al. 2022

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“…In addition, the coating position of polyurea is crucial, and its effect seems disparate among diverse substrates and different types of polyurea [ 25 ]. It is now well established by various studies that the polyurea layer can provide considerable protection for metal and concrete substrates [ 26 , 27 , 29 , 35 , 36 ]. Despite the encouraging results achieved with metal substrates, relatively few studies have explored how polyurea performs when it is applied to ceramic armors that are subjected to projectile impact.…”

Section: Introductionmentioning

confidence: 99%

Ballistic Performance of Polyurea-Reinforced Ceramic/Metal Armor Subjected to Projectile Impact

et al. 2022

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Although polyurea has attracted extensive attention in impact mitigation due to its protective characteristics during intensive loading, the ballistic performance of polyurea-reinforced ceramic/metal armor remains unclear. In the present study, polyurea-reinforced ceramic/metal armor with different structures was designed, including three types of coating positions of the polyurea. The ballistic tests were conducted with a ballistic gun; the samples were subjected to a tungsten projectile formed into a cylinder 8 mm in diameter and 30 mm in length, and the deformation process of the tested targets was recorded with a high-speed camera. The ballistic performance of the polyurea-reinforced ceramic/metal armor was evaluated according to mass efficiency. The damaged targets were investigated in order to determine the failure patterns and the mechanisms of interaction between the projectile and the target. A scanning electron microscope (SEM) was used to observe the microstructure of polyurea and to understand its failure mechanisms. The results showed that the mass efficiency of the polyurea-coated armor was 89% higher than that of ceramic/metal armor, which implies that polyurea-coated ceramic armor achieved higher ballistic performance with lighter mass quality than that of ceramic/metal armor. The improvement of ballistic performance was due to the energy absorbed by polyurea during glass transition. These results are promising regarding further applications of polyurea-reinforced ceramic/metal armor.

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“…In recent years, improving the performances of matrix materials by film technology, surface modification technology, and coating technology has become a popular research area in the industry. In particular, PU coating spraying technology is used to improve the blast and penetration resistances of metallic or nonmetallic materials, and the performance is particularly outstanding (Stergiou et al, 2021;Grujicic et al,2012).…”

Section: Introductionmentioning

confidence: 99%

High-hardness polyurea coated steel plates subjected to combined loadings of shock wave and fragments

Zhang

Wang

et al. 2022

Lat. Am. j. solids struct.

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To investigate the effect of polyurea on the protective performance of a steel target plate under the combination of shock wave and fragments, the failure characteristics, damage process and micro mechanism of the polyurea coated steel plates with different coating methods under the combination of explosion shock waves and fragments were analyzed through experiments and numerical simulations. The results showed that single-sided coatings aggravated the damage of target plate when the coating thickness was 2 mm. While the polyurea thickness greater than 4 mm could significantly reduce the damage degree of the steel plate. When the polyurea was coated on the double sides, it would aggravate the damage, no matter how thick the polyurea was. Through microscopic research, it was found that the front coated polyurea was severely ablated by detonation products, which greatly reduce its energy absorption efficiency. The polyurea coated on the back underwent tensile fracture under the influence of tensile stress wave. The breaking of intramolecular hydrogen bond of polyurea was the key to the energy absorption of polyurea.

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Impact of polyurea-coated metallic targets: Computational framework

Cited by 16 publications

References 46 publications

Polyurea for Blast and Impact Protection: A Review

Polyurea for Blast and Impact Protection: A Review

Ballistic Performance of Polyurea-Reinforced Ceramic/Metal Armor Subjected to Projectile Impact

High-hardness polyurea coated steel plates subjected to combined loadings of shock wave and fragments

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