Dynamic cavity-expansion penetration model of elastic-cracked-crushed response for reinforced-concrete targets

• Published in: International journal of impact engineering 2021-11, Vol.157, p.103981, Article 103981
• Main Authors: Deng, Y.J., Chen, X.W., Song, W.J.
• Format: Article
• Language: English
• Subjects: Compressibility; Concrete; Concrete construction; Concrete properties; Cracked region; Crushing; Depth of penetration (DOP); Dynamic cavity-expansion theory; Empirical analysis; Impact resistance; Penetration; Penetration resistance; Projectiles; Rebar; Reinforced concrete; Reinforcement ratio
• ISSN: 0734-743X; 1879-3509
• DOI: 10.1016/j.ijimpeng.2021.103981

•An improved theoretical model for dynamic cavity-expansion of reinforced concrete is proposed considering the circumferential restriction effects of the reinforcing bars in cracked and crushed regions.•The effect of reinforcement ratio on the radial stress at the cavity surface is analyzed considering the concrete restriction effect, and thus, a simplified empirical formula of the radial stress is obtained.•A model for the projectile directly impacting the reinforcing bars is proposed; the engineering formula to calculate the penetration resistance of reinforced-concrete target is obtained. Herein, an improved dynamic cavity-expansion model for penetration of reinforced-concrete targets is proposed. The circumferential restriction effect derived from reinforcing bars in both the cracked and crushed regions has been considered in the proposed model, and the theoretical solutions for the cavity radial stress in compressible and incompressible reinforced concrete are obtained. Through the analysis of concrete strength and reinforcement ratio, we establish a simplified formula to calculate the penetration resistance of reinforced-concrete targets. Moreover, the calculation method of a direct impact resistance for the projectile on the reinforcing bars is developed, and thus, the engineering model for penetration of reinforced-concrete target is constructed. By comparing with the experimental data and empirical formula, the validity of this new model is further verified.