Blast responses of polyurea-coated concrete arches

Liu, Yang; Wang, Peng; Jin, Fengnian; He, Huguang; Zhou, Yinzhi; Chen, Hailong; Zhou, Jiannan; Wang, Bo; Fan, Hualin

doi:10.1007/s43452-021-00182-x

Cited by 27 publications

(15 citation statements)

References 22 publications

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“…Iqbal et al [54] found that their synthesized polyurea required at least 1013 Hz for the glass transition to occur at ambient temperatures, which is not enough to allow the glass transition of polyurea. The same phenomenon was found in concrete structures protected by polyurea by Liu et al [40]. This indicates that blast loading puts the polyurea in a strain-hardened state when only the loading frequency is considered, which is not sufficient to induce several of the above polyureas to enter the glass state and undergo brittle failure.…”

Section: Soft and Hard Segment Rearrangement Crystallization And Hard...supporting

confidence: 70%

“…With blast and impact loading, the effect of polyurea on the dynamic response of the protected substrate is complicated. Both Liu [40] and Iqbal et al [54] considered that The relaxation behavior of polyurea is attributed to the chain kinematics of the polyurea molecules and the variation in chain length and angle [87]. The relaxation of polymers has an effect on their mechanical properties, in particular, on deformation, yield, fracture behavior, toughness, impact strength and brittle-tough transitioning [88].…”

Section: Protection Mechanismsmentioning

confidence: 99%

“…With blast and impact loading, the effect of polyurea on the dynamic response of the protected substrate is complicated. Both Liu [40] and Iqbal et al [54] considered that In addition, researchers have recently found that adding reinforcing materials to polyurea increases the strain rate sensitivity of polyurea. Liu et al [68] revealed that the flow stress and compressive strength increased by 12.8% and 12.1%, respectively, under a strain rate of 8000 s −1 load compared to unreinforced polyurea with the SiC-reinforced polyurea.…”

Section: Protection Mechanismsmentioning

confidence: 99%

“…With blast and impact loading, the effect of polyurea on the dynamic response of the protected substrate is complicated. Both Liu [40] and Iqbal et al [54] considered that shock-wave-induced hard domain ordering and crystallization, rearrangements and neutralization appear to be the dominant modes of energy dissipation in polyurea under blast loading conditions. This process is also accompanied by viscoelastic dissipation of the material, enhanced mechanical properties due to strain rate effects and the effect of impedance mismatch between the substrate and polyurea.…”

Section: Protection Mechanismsmentioning

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: Soft and Hard Segment Rearrangement Crystallization And Hard...supporting

confidence: 70%

Section: Protection Mechanismsmentioning

confidence: 99%

Section: Protection Mechanismsmentioning

confidence: 99%

Section: Protection Mechanismsmentioning

confidence: 99%

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Polyurea for Blast and Impact Protection: A Review

et al. 2022

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“…As important structural members, reinforced concrete arches are widely used in underground protective structures [1][2][3]. With the development of defense engineering, the protective structure is required not only to have excellent mechanical properties but also to be used in some special environments, such as under explosion.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Responses of Blast-Loaded Shallow Buried Concrete Arches Strengthened with BFRP Bars

Jian-qin

Zhou

et al. 2022

Materials

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This paper proposes a prefabricated basalt fiber reinforced polymer (BFRP) bars reinforcement of a concrete arch structure with superior performance in the field of protection engineering. To study the anti-blast performance of the shallow-buried BFRP bars concrete arch (BBCA), a multi-parameter comparative analysis was conducted employing the LS-DYNA numerical method, which was verified by the results of the field explosion experiments. By analyzing the pressure, displacement, acceleration of the arch, and the strain of the BFRP bars, the dynamic response of the arch was obtained. This study showed that BFRP bars could significantly optimize the dynamic responses of blast-loaded concrete arches. The damage of exploded BBCA was divided into five levels: no damage, slight damage, obvious damage, severe damage, and collapse. BFRP bars could effectively mitigate the degree of damage of shallow-buried underground protective arch structures under the explosive loads. According to the research results, it was feasible for BFRP bars to be used in the construction of shallow buried concrete protective arch structures, especially in the coastal environments.

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