When shaped charge penetrats into concrete,crater diameter must meet certain requirements.By using theories of shaped jet formation and crater diameter growth during jet penetrating concrete,we revealed the thresholds...When shaped charge penetrats into concrete,crater diameter must meet certain requirements.By using theories of shaped jet formation and crater diameter growth during jet penetrating concrete,we revealed the thresholds of the velocity and diameter of jet head,and therefore obtained the related structure parameters of top liner,so that shaped charge structure was developed.We built a?60mm copper liner and a?142mm Ti-alloy liner which followed the rules of 0.6cal and 0.7cal in-crater diameter.respectively.X-ray experiment and penetration test results showed that the parameters of jet head were consistent with the results of theoretical analysis.The in-crater diameter of?60mm shaped charge reached 36 mm,and the?142mm one reached 100 mm.They both met the design requirements.展开更多
The aim of this study is to develop concrete composites that are resistant to armor-piercing projectiles for defense structures.Different reinforcement configurations have been tested,such as short steel fibers,long s...The aim of this study is to develop concrete composites that are resistant to armor-piercing projectiles for defense structures.Different reinforcement configurations have been tested,such as short steel fibers,long steel fibers,and steel mesh reinforcement.Three different concrete mix designs were prepared as“Ultra High Performance(UHPFRC),High Performance(HPFRC)and Conventional(CFRC)Fiber Reinforced Concrete”.The content of hybrid steel fibers was approximately 5%in the UHPFRC and HPFRC mixtures,while the steel fiber content was approximately 2.5%in the CFRC mixture.In addition,a plain state of each mixture was produced.Mechanical properties of concrete were determined in experimental studies.In addition to the fracture energy and impact strength,two important indicators of ballistic performance of concrete are examined,which are the penetration depth and damage area.The results of the study show that the depth of penetration in UHPFRC was around 35%less than that in HPFRC.It was determined that the mixtures of UHPFRC and HPFRC containing 5%by volume of hybrid steel fibers showed superior performance(smaller crater diameter and the less projectile penetration depth)against armor-piercing projectiles in ballistic tests and could be used in defense structures.展开更多
文摘When shaped charge penetrats into concrete,crater diameter must meet certain requirements.By using theories of shaped jet formation and crater diameter growth during jet penetrating concrete,we revealed the thresholds of the velocity and diameter of jet head,and therefore obtained the related structure parameters of top liner,so that shaped charge structure was developed.We built a?60mm copper liner and a?142mm Ti-alloy liner which followed the rules of 0.6cal and 0.7cal in-crater diameter.respectively.X-ray experiment and penetration test results showed that the parameters of jet head were consistent with the results of theoretical analysis.The in-crater diameter of?60mm shaped charge reached 36 mm,and the?142mm one reached 100 mm.They both met the design requirements.
基金This work was completed when the first author was R&D Manager at ISTON.The authors would like to thank ISTON Corporation and its R&D employees for their contributions.
文摘The aim of this study is to develop concrete composites that are resistant to armor-piercing projectiles for defense structures.Different reinforcement configurations have been tested,such as short steel fibers,long steel fibers,and steel mesh reinforcement.Three different concrete mix designs were prepared as“Ultra High Performance(UHPFRC),High Performance(HPFRC)and Conventional(CFRC)Fiber Reinforced Concrete”.The content of hybrid steel fibers was approximately 5%in the UHPFRC and HPFRC mixtures,while the steel fiber content was approximately 2.5%in the CFRC mixture.In addition,a plain state of each mixture was produced.Mechanical properties of concrete were determined in experimental studies.In addition to the fracture energy and impact strength,two important indicators of ballistic performance of concrete are examined,which are the penetration depth and damage area.The results of the study show that the depth of penetration in UHPFRC was around 35%less than that in HPFRC.It was determined that the mixtures of UHPFRC and HPFRC containing 5%by volume of hybrid steel fibers showed superior performance(smaller crater diameter and the less projectile penetration depth)against armor-piercing projectiles in ballistic tests and could be used in defense structures.
