Abstract
By studying cyclic deformation of both mono- and polycrystalline copper with a fast response recorder, we have discovered an interesting substructure in hysteresis loops. This effect is caused by strain avalanches, which occur in loop patches, persistent slip bands and cellular dislocation structures. The behavior of the strain avalanches changes as life is expended and offers a means of measuring the current state of fatigue damage. They are especially pronounced when cracks are propagating. We believe that strain avalanches provide a useful tool for understanding cyclic deformation and fracture and for a novel method of nondestructive testing.
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