Effect of electric current pulses on the development of failure of steel 03Kh20N16AG6 at 4.2 K
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The article presents the results of the experimental investigation of the special features in the development of failure of steel 03Kh20N16AG6 at 4.2 K. It shows that the local maxima of load observed to the left of the five-percent secant on the stress-displacement diagram are associated with the formation of a plastic zone at the crack tip by jumplike low-temperature deformation. It was established that the unstable crack development corresponds to a local maximum of load coinciding with the point of intersection of the five-percent secant with the load-dis-placement diagram or found immediately after it. Electric current pulses stimulate plastic deformation at the crack tip in the loaded specimen. Here the plastic zone forms without jumps of the load, and already the first observed local maximum corresponds to unstable crack development.
KeywordsPlastic Deformation Experimental Investigation Local Maximum Current Pulse Plastic Zone
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