Model test study on damage depth of concrete target under penetration and explosion

In order to study the influence of the cavity on the explosion effect caused by the penetration of concrete target, model tests of penetration and explosion of concrete target at the velocity of 450–700 m/s were carried out. Based on 10 sets of test results and dimensional analysis, the effect of penetration result on the depth of blast hole is studied. Results indicate that the dimensionless impact coefficient Ip can be used to characterize the penetration effects such as penetration depth, hole volume and penetration damage value, regardless of length-diameter ratio of charge, the increase of damage depth is mainly influenced by dimensionless impact coefficient Ip and explosion coefficient Ie. Based on the experimental data, influence rule of the depth of crater is obtained for the length-diameter ratio of 5: (1) when the Ip is small, the penetration depth is small, the change of Ie has little influence on the depth of crater he; (2) with the increase of Ip, he increases at a decreasing rate, influence of Ie on he increases; (3) with the increase of Ip to a certain extent, he tends to reachsaturation value, influence of Ie on he tends to be stable.