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Studies of impact phenomena

1980; Elsevier BV; Volume: 64; Issue: 1 Linguagem: Inglês

10.1016/0043-1648(80)90095-2

1873-2577

Gideon Levy, A.A. Parry,

Electromagnetic Launch and Propulsion Technology

An experimental investigation and a theoretical treatment of impacting bodies are described. High energy impact experiments were performed by repeatedly striking a rectangular section metal fin on the face of a massive hammer against an equally massive anvil specimen at 300 and 650 °C. A theory in terms of work hardening has been developed relating the ultimate plastic strain in the fin to the (constant) impact speed. Experimental results over a range of impact speeds from 240 to 430 mm s−1 produced plastic strains up to 0.12 at 650 °C and showed reasonable agreement with the proposed theory. Where the surface geometry of impacting bodies can be idealized as sphere on flat the deformation rapidly reaches a limit for repeated impacts, even in the absence of work hardening, when the impacts become essentially elastic. A theory incorporating the elastic-plastic treatment of static indentation is advanced that connects the elastic and fully plastic behaviour to predict observations. The theory is more satisfactory physically and provides a better fit to experimental data than previous simpler theories.