Abstract
Experimental data on the propagation of changes in strain associated with an unstable load are presented. These deformations frequently propagate at speeds which are less than 10 in/sec. These large amplitude deformations are the result of adding small increments of the load at long time intervals. The wave speed calculated from the Karman-Taylor wave theory and based on a smooth stress-strain relation for the material is 18 × 10 3 in/sec. One large change in strain ‘propagates’ at an average, speed of 3·7 × 10 −3 in/sec. These slowly propagating deformations occur only at certain discrete loads in prestressed specimens of annealed aluminum. Between these loads, the response is approximately that of a linearly elastic material. Some data on preloaded specimens tested in a torsional impact apparatus are also included.
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