The paper dwells upon the study of behavior of fragments of steel cylindrical shells loaded by detonation products. From the modern viewpoint a shell is accelerated by products of explosion to its breakup, and the maximum velocity of fragments is the velocity of shell at breakup. The behavior of fragments in the cloud of detonation products has not been practically studied. In order to measure the velocity of the shell and its fragments at the distance to 2…3 m one proposed a simple and reliable method with the help two types of electric-contact sensors: nail-type sensors to measure the velocity of the shell, and plane sensors to measure the velocity of fragments. Tests have been done on steel shells and two types of explosives: phlegmatized RDX and very phlegmatized RDX with aluminum. Test show, when using phlegmatized RDX the maximum velocity of fragments is achieved at the distance to r≈10r_0 (r_0 is the initial radius of the shell), and when using metallized explosive (RDX with aluminum) at the distance to r ≈ 30r_0.
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