Rear-surface collapse perforation of concrete targets under buried explosion: Fid-Bau Portal

Rear-surface collapse perforation of concrete targets under buried explosion

Duan, Zhuo-Ping / Zhang, Hai-Ying / Lu, Zhong-Jie / Ou, Zhuo-Cheng / Liu, Yan / Huang, Feng-Lei

Highlights • The collapse perforation at the rear surface of thickness concrete under buried explosion of cylindrical charge was studied. • The relationship between critical collapse thickness on concrete and charge’s length-to-diameter ratio is developed. • There exists an incomplete similarity of the critical collapse thickness in the diameter of cylindrical explosive charge. • There exists a maximum value for the critical thickness Rc under a certain diameter of explosive charge. • The spherical assumption on charge is available when the length-to-diameter ratio is not larger than about 2.

Abstract Experimental research on collapse and perforation failure at the rear surface of a concrete target induced by buried explosion of a cylindrical explosive charge was performed. The aim is to develop an available approach to predict the critical collapse thickness under explosion loading. It is found that both the diameter and the length-to-diameter ratio of the cylindrical explosive charges have remarkable influence on the critical collapse thickness. Based on the experimental data for the plain concrete with the compressive strength of 35MPa, an analytical expression for the relation between the dimensionless critical collapse thickness on concrete target and the length-to-diameter ratio of explosive charge is developed via dimensional analysis. Moreover, it is also found that there exists an incomplete similarity of the critical collapse thickness in the diameter of explosive charge, although the complete similarity in the length-to-diameter ratio alone cannot be established.