Energy-Based Penetration Model for Local Impact-Damaged Concrete Members

Hwang, Hyeon‐Jong; Kim, Sanghee; Kang, Thomas H.‐K.

doi:10.14359/51689868

Cited by 10 publications

(27 citation statements)

References 30 publications

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“…x pe d p = 1.1875 + 0.0299I for 21.0 < I ≤ 455 (7) where x pe is the penetration depth (m); N p is the nose shape factor (0.72, 0.84, 1.0, and 1.14 for flat, hemispherical, blunt, and very sharp noses, respectively); M p is the mass of a projectile (kg); d p is the diameter of a projectile (m); V imp is the impact velocity of a projectile (m/s); and f' c is the compressive strength of concrete (Pa). Hughes [13] proposed an impact formula using the force-penetration model.…”

Section: Literature Reviewmentioning

confidence: 99%

Section: Impact Mechanism and Energy Conservationmentioning

confidence: 99%

“…Hwang et al [7] defined the impact mechanism and derived the consumed energies. In this paper, the impact mechanism, regardless of the panel's thickness, is redefined, and each consumed energy is newly derived, by referring to Hwang et al [7]. The energies involved in the impact mechanism can be divided into five types, and two additional types in the case of special conditions, as shown in Figure 2.…”

Section: Impact Mechanism and Energy Conservationmentioning

confidence: 99%

“…Therefore, a new theoretical model, rather than that based on the experimental results, and a theoretical framework are required to develop a new impact formula. This paper proposes a new impact formula based on the theoretical framework proposed by Hwang et al [7], and the study on the impact mechanism, impact force, strain rate, and coefficient related to the penetration is extended. The proposed model is derived from the energy conservation law and the new impact mechanism.…”

Section: Introductionmentioning

confidence: 99%

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Development of Energy-Based Impact Formula—Part I: Penetration Depth

Kim

Kang

2020

Applied Sciences

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Predicting the damage to a concrete panel under impact loading is difficult due to the complexity of the impact mechanism of concrete. Based on the experimental results obtained by various researchers, the energies involved in the impact mechanism are classified into seven categories: Kinetic energy, deformed energy of a projectile, elastic penetration resistance energy of the panel, overall deformed energy of the panel, spalling-resistant energy, tunneling-resistant energy, and scabbing-resistant energy. Using these impact mechanisms and the energy conservation law, a new energy-based penetration depth formula is proposed to predict the penetration depth. This is validated using 402 impact test results, which include those with high-strength concrete, ultra-high-performance concrete (UHPC), or steel fiber-reinforced concrete, those under very high-velocity impact, and those with a very low ratio of target panel thickness to projectile diameter. It is found that the new impact formula predicts the penetration depth quite well.

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Section: Literature Reviewmentioning

confidence: 99%

Section: Impact Mechanism and Energy Conservationmentioning

confidence: 99%

Section: Impact Mechanism and Energy Conservationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Development of Energy-Based Impact Formula—Part I: Penetration Depth

Kim

Kang

2020

Applied Sciences

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“…Others described the penetration resistance first, then used it to derive the penetration depth, such as the penetration resistance model by Forrestal et al (1994) that was based on shooting range test [3]. Some proposed computational models such as Johnson and Holmquist (1994) [4] who proposed an improved computational constitutive model for concrete, while Hwang et al (2017) [5] proposed an energy-based model for local impact causing damage to concrete members, they focused on the resistant energy of the concrete target and kinetic energy of the projectile.…”

Section: Introductionmentioning

confidence: 99%

Investigation of High-Velocity Projectile Penetrating Concrete Blocks Reinforced by Layers of High Toughness and Energy Absorption Materials

Elhozayen

Laissy²,

Attia

2019

Civ Eng J

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Recently, the need to protect people and structures against attacks of terrorists are of a high increase. The main objective of this paper is to enhance the concrete resistance against ballistic impact of high velocity projectile by using different combination layers from different materials as reinforcement for concrete and investigate their effect on the penetration depth of projectile and the resulted damage of concrete. The investigation presents the development of a finite element accurate models using AUTODYN 3D. The Lagrangian formulation numerical techniques is used to model the projectile and concrete target. The investigated models are reinforced using different layers combinations of several materials such as ceramics, fiber composite, polymer and metal: (AL2O3 - 99.7% and Kevlar- epoxy, Teflon and aluminum alloy 6061-T6) .Those materials were chosen because of their high thermal shock resistance or their great capability in energy absorption. The main findings showed a significant enhancement in the reduction of penetration depth compared to the concrete resistance without reinforcement, which demonstrate the great performance of the used combinations in the shock wave propagation. Hence from the findings of this work we can say that the concrete reinforced by ceramics or aluminum alloy with fiber composite or polymer can be used for several applications as it represents a successful anti-penetration composite structure.

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