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- W2164260660 abstract "Samples have been subject to plane shock waves of intensities up to 600 kbars and recovered substantially undamaged. Deformation in a shock front has a unidirectional character that distinguishes it from other modes of deformation and is in essence a transformation from normal to high-density material produced by the translation of a well-defined two-dimensional interface. Both copper and iron are hardened by ca.4OO-kbar shock more than by cold-rolling to 95% reduction, although the dimensions of the sample are virtually unchanged. Copper after shocks of above about 200 kbars shows numerous mechanical twins, which, however, make no significant contribution to the hardening. They occur most frequertly at angles of 30 deg to the rarefaction direction and do not appear in the zone where rarefaction is steepest. Iron, conversely, develops Neumann bands on compression and above 130 kbars undergoes a transition to a different phase, which after return to atmospheric pressure, leaves a complex microstructure reminiscent of carbon-free martensite. If the first of the two shocks associated with the transition in iron is reflected as rarefaction by a free surface, it can be made to interact with the second shock and, by abruptly decreasing the pressure, will preserve details of the shockmore » front that have hitherto been inaccessible. The shock front is no thicker than 0.02 mm and the transformation occurs in times of the order of 1O/sup -9/ sec. Measurements of the position of the interaction zone give directly the ratio of the velocities of the two shocks. Metallography promises to be a useful tool in studies of shock hydrodynamics. (auth)« less" @default.
- W2164260660 created "2016-06-24" @default.
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- W2164260660 date "1958-10-01" @default.
- W2164260660 modified "2023-09-26" @default.
- W2164260660 title "METALLOGRAPHIC STUDIES OF METALS AFTER EXPLOSIVE SHOCK" @default.
- W2164260660 hasPublicationYear "1958" @default.
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