High Velocity Deformation of Solids: Symposium Tokyo/Japan by K. Kawata, S. Hashimoto, K. Kurokawa (auth.), Dr. Eng. Kozo

By K. Kawata, S. Hashimoto, K. Kurokawa (auth.), Dr. Eng. Kozo Kawata, Dr. Eng. Jumpei Shioiri (eds.)

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Resistance to ejection of the dislocations at the boundary is provided by the opposing force resulting from the intersection of glide bands. The length of the long glide bands presumably increases with the number of dislocations necessary to accommodate the given incompatibility. It should also decrease with increasing yield stress, due to arrest of dislocations at higher stress levels. Partial confirm- ation of the latter hypothesis comes from experiments on hard irradiated crystals which have a much higher yield stress (more than tenfold) and resulted in much shorter glide bands (less than one tenth) emanating from the boundary even though the surface preparation was 47 the same as for annealed specimens and the recorded wave profiles were also similar to those for annealed specimens.

21]. Reference [22] has become a classic in this field and should not be overlooked. Generally speaking, all of these codes integrate forward in time and permit different types of materials. The most commonly used time integration method for nonlinear wave propagation calculations is the explicit, central difference method with the artificial viscosity method of von Newmann and Richtmyer (see Ref. [23]). g. implicit time integration) are sometimes used for structural problems but, for the high velocity motions and history dependent stress paths induced by explosive loadings, the traditional method appears to be the most economical.

Response of Metals to High Velocity Deformation, Interscience, New York (1961),93. ; Kumble, R. : Viscous drag on dislocations at high strain rates in copper. J. App1. , 40, (1969), 3475-3480. 9 Eddington, J. : The influence of strain rate on the mechanical properties and dislocation substructure in deformed copper single crystals. Phil. , 17 (1969), 1189-1206. 10 High strain-rate tests. Techniques in Vol. V, Part 1, Interscience, New York Campbell, J. : Temperature and rate effects in metal plasticity.

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