Experimental Study on Local Damage to Reinforced Concrete Panels Subjected to Oblique Impact by Projectiles

Okuda, Yukihiko; Nishida, Akemi; Kang, Zuoyi; Tsubota, Haruji; Li, Yinsheng

doi:10.1115/1.4054040

Cited by 3 publications

(3 citation statements)

References 3 publications

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“…Scabbing damage is caused by an impact impulse that propagates as a compressive stress wave and changes into a tensile stress wave at the free boundary of the rear face. Investigating the damage conditions during the impact tests showed that only the normal direction component of the impact force contributes to scabbing damage (Okuda et al, 2022). If the proposed reduction effect of the scabbing damage regarding the impact angle θ is due to the normal direction component of the impact force, the reduction factor β(θ) due to the impact angle can be expressed as 𝛽(𝜃) = 𝑐𝑜𝑠𝜃.…”

Section: Reduction Factorsmentioning

confidence: 99%

“…Considering the above issues, this study focused on the rigidity and impact angle of a projectile and started research and development to evaluate the impact of local damage to structures caused by projectile impacts. In previous impact tests (Okuda et al, 2022), projectiles with a flat nose were employed, and the nose shape, as experienced by the RC panel, changed depending on the impact angle. This study adopted a projectile with a hemispherical nose to eliminate the effect of the nose shape on the impact behavior.…”

Section: Introductionmentioning

confidence: 99%

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Experimental study on scabbing limit of local damage to reinforced concrete panels subjected to oblique impact by projectile with semispherical nose

Okuda

Kang

Nishida

et al. 2023

Mechanical Engineering Journal

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The influence evaluation against projectile impacts has attracted much attention for the safety assessment of nuclear-facility buildings subjected to projectiles, such as tornado missiles or aircraft. Many experimental studies have been reported on the impact resistance of reinforced concrete (RC) structures. Based on these results, many empirical formulas for penetration depth, scabbing limit thickness, and perforation-limit thickness have been proposed for the local damage evaluation. However, most formulas were derived from impact tests based on normal impact to target structures using rigid projectiles that do not deform during impact. Therefore, this study develops a local damage evaluation method considering the rigidity of projectiles and oblique impacts that should be considered in realistic projectile impact phenomena. Specifically, we focused on scabbing, defined as the peeling off the back face of the target opposite the impact face, and conducted impact tests on RC panels to clarify the scabbing limit by changing the impact velocity in an oblique impact. The effects of the projectile rigidity and oblique impact on the scabbing limit were investigated based on the test results. This work presents the test conditions, equipment, results, and the scabbing limit on the local damage to RC panels subjected to oblique impacts.

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Section: Reduction Factorsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental study on scabbing limit of local damage to reinforced concrete panels subjected to oblique impact by projectile with semispherical nose

Okuda

Kang

Nishida

et al. 2023

Mechanical Engineering Journal

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“…They observed that the strength of the projectiles and the concrete targets significantly affected the penetration depth and critical velocities. Okuda et al [24] performed impact tests using soft projectiles to evaluate local damage to reinforced concrete. They also presented test conditions, test equipment, test results, and knowledge gained on localized damage to reinforced concrete subjected to normal and oblique impacts.…”

Section: Introduction 1generalmentioning

confidence: 99%

Deformable nose design for the non-penetrating projectile

Taheri

Kavianipour

2023

Scientia Iranica

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This paper deals with the design of a deformable nose for the non-penetrating projectile in order to prevent its body deformation. Numerical, analytical and experimental studies have been carried out to analyze the effect of different nose shapes on the projectile deformation when it hits the brick wall. The projectile consists of an aluminum nose, a thin-walled steel cylinder body, and an end connector. This non-penetrating projectile can be used to carry a cargo that must reach its destination safely, for example in firefighting applications. To pursue this goal, the criterion utilized for the best design in this paper is stress and strain analysis. The geometric shape of the noses includes three types: type (a), type (b), and type (c). The first type of nose was flat shape. This nose was detached from the projectile by impact and did not prevent the projectile deformation. The second type of nose was a combination of flat and conical shapes. The projectile was also deformed by this nose. The third type of nose was a combination of flat, conical, and spherical shapes. Due to the maximum absorption of the impact energy, this type of nose prevented the deformation of the cargo and projectile.

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Generative adversarial networks for overlapped and imbalanced problems in impact damage classification

Doan,

Keshtegar,

Kim

et al. 2024

Information Sciences

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Experimental Study on Local Damage to Reinforced Concrete Panels Subjected to Oblique Impact by Projectiles

Cited by 3 publications

References 3 publications

Experimental study on scabbing limit of local damage to reinforced concrete panels subjected to oblique impact by projectile with semispherical nose

Experimental study on scabbing limit of local damage to reinforced concrete panels subjected to oblique impact by projectile with semispherical nose

Deformable nose design for the non-penetrating projectile

Generative adversarial networks for overlapped and imbalanced problems in impact damage classification

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