Theoretical and experimental study of shaped charge jet penetration into high and Ultra-high strength concrete targets

• Published in: International journal of impact engineering 2018-12, Vol.122, p.431-438
• Main Authors: Zhu, Qi-feng, Huang, Zheng-xiang, Xiao, Qiang-qiang, Zu, Xu-dong, Jia, Xin
• Format: Article
• Language: English
• Subjects: Bernoulli Hypothesis; Blasting; Cavity diameter; Compressive strength; Concrete; Depth of penetration; Elastic waves; Electric vehicles; High and ultra-high strength concrete; High strength concretes; Impact resistance; Penetration; Penetration resistance; Projectiles; Shaped charge jet; Tensile strength; Terminal ballistics
• ISSN: 0734-743X; 1879-3509
• DOI: 10.1016/j.ijimpeng.2018.04.010

•This paper discussed the evolution of the response regions in front of the jet/target interface as the shaped charge jet (SCJ) moves into high and ultra-high strength concrete (H&UHSC) targets. Four-stage penetration process was proposed, which was an extension to the conventional A–T model. The two-stage cavity growth mechanism was used to describe the radial cavity growth mode, basing on the four penetration equations. The depths and cavity diameters predicted from the present model exhibit better agreement with the experimental data comparing with other models. The obtained values of the dimensionless parameters A and B can be used to calculate the depths and cavity diameters of H&UHSC targets generated by different configurations of shaped charge.•Systematic experiments of SCJ penetration into H&UHSC targets were conducted, which had not been widely researched before. The depth of penetration (DOP) for concrete targets generated by a jet is required to achieve a certain value, under the premise of which the crater diameter must be sufficiently large in the present design of a shaped charge. A large cavity generated by the precursor shaped charge of a tandem warhead is conducive to the penetration of the follow-through projectile. Given the rapidly developing and increasingly extensive application of high and ultra-high strength concrete (H&UHSC), which has excellent resistance to penetration, impact and blasting, shaped charge jet penetration into the targets was investigated in this study. The chase between the incoming elastic wave, plastic wave and the jet/target interface as the shaped charge jet moves into H&UHSC targets were discussed. The response regions in the target were analyzed. Four penetration stages were proposed, while the corresponding modified Bernoulli equations were established. The two-stage mechanism of cavity growth was used to describe the penetration modes. Furthermore, the DOP experiments for two different structures of shaped charge penetration into H&UHSC targets with four strength grades were conducted. The predictions of depths and hole profiles from the present model correlate with the experimental data reasonably well. Results indicate that the DOP decreases exponentially as the compressive strength of H&UHSC increases at the beginning, and then the rate of the decreasing tendency slows down gradually and approximates the limit when the compressive strength approaches 200 MPa. Moreover, the cavity diameters resulted fro