A parametric study on the high-velocity projectile impact resistance of UHPC using the modified K&C model. (1st April 2022)

• Record Type: Journal Article
• Authors: Zhang, Fengling; Zhong, Rui
• Is Part Of: Journal of building engineering. Volume 46(2022)
• Publication Date: 2022-04-01
• Subjects: K&C model -- Projectile impact -- Ultra-high performance concrete (UHPC) -- Penetration depth -- Crater; Building -- Periodicals; 690.05
• DOI: 10.1016/j.jobe.2021.103514
• Languages: English
• ISSNs: 2352-7102

Abstract

Abstract: This paper presents a comprehensive parametric study on the influence of various aspects on the depth of penetration (DOP) and equivalent crater diameter (ECD) of ultra-high performance concrete (UHPC) caused by high-velocity projectile impact (HVPI) using a modified K&C model. Parameters selected for the investigation include the material properties of UHPC (compressive strength, tensile strength, toughness, elastic modulus, density and dynamic increase factor (DIF)), specimen dimensions (thickness and width), and test conditions (projectile nose shape and striking velocity). Within the range of the investigated material parameters of UHPC, the compressive strength and DIF under compression are the most influential ones for the DOP, while the tensile strength and DIF under tension have the greatest influence on the ECD. It was also found that the Li-Chen equation outperforms other commonly used equations in predicting the DOP of UHPC subjected to HVPI. The findings of this paper facilitate the understanding on the key parameters dictating the resistance of UHPC subjected to HVPI, which shed light on the optimization of UHPC mixture design for the applications in protective structures. Highlights: Parametric study on penetration depth and equivalent crater diameter of UHPC subjected to high-velocity projectile impact. The influence of material properties, specimen dimensions, and test conditions on the resistance of UHPC to HVPI. The most influential parameters for the penetration depth and equivalent crater diameter of UHPC subjected to HVPI. Applicability of some widely used empirical/semi-empirical equations for estimating the penetration depth of UHPC.