SEDL / STP / STP336-EB / STP42035S

Fracture of Single Crystals under Explosive Loading

Glass, C. M.
Ballistic Research Laboratories, Aberdeen Proving Ground, Md.

Golaski, S. K.
Ballistic Research Laboratories, Aberdeen Proving Ground, Md.

Misey, J. J.
Ballistic Research Laboratories, Aberdeen Proving Ground, Md.

Moss, G. L.
Ballistic Research Laboratories, Aberdeen Proving Ground, Md.

Pages: 24    Published: Jan 1963

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Abstract

Experiments have been carried out on high-velocity deformation and fracture of metals. Aluminum and copper single crystals and polycrystalline specimens have been subjected to explosive loading and the following results havebeen obtained: (1) Crystal orientation influences the reaction of the metal specimens at pressures of testing above 100 kilobars. The orientation factor causes a redistribution of flow in the reflected tensile wave. (2) The fracture of the specimen is not instantaneous, but times between 10⁴ and 10⁶ sec are required. (3) A measure of the macroscopic theoretical strength of the metal has been obtained. (4) Crack velocities have been calculated. (5) The concept of an energy criterion for fracture, rather than a maximum stress criterion, is implied from the data.