A series of magnesium single crystals, from 0.2 to 3 mm thick, were shock loaded in directions parallel and perpendicular to the c-axis of the hexagonal closed packed (hcp) structure and at 45° to the c-axis. Shock compression along the c-axis is associated with the largest Hugoniot elastic limit (HEL) for this material. Microscopic observation of recovered c-cut samples demonstrated intense twinning with a greater density of twins near the impact surface. The low-energy basal slip was activated by shock loading along the inclined direction and has the smallest HEL. In all cases, we observe the decay of the elastic precursor wave and growth of the HEL with increasing temperature. For the inclined shock compression after the HEL, two plastic waves were found where the stress level of the first plastic wave depends on the peak shock stress. Finally, the largest spall strength was along the transversal direction and the smallest in the off-axis direction. The fracture surface of the sample of transversal orientation contains numerous groves oriented along the base planes of the crystals.

The residual strength of low-carbon steel after cyclic loading before different numbers of cycles at various stress amplitudes is estimated. The correlation of the residual strength with the damage,...

The deformation and fracture localization characteristics are estimated by the methods of replicas, acoustic emission, metal magnetic memory, ultrasonic attenuation, microhardness, and electrical...

The stages of changing the acoustic emission characteristics of 15Kh2GMF steel used for manufacturing oil-pump sucker rods is studied during tension before and after preliminary cyclic loading to various values of relative life. The revealed stages are shown to agree with the data of estimating the development of real damage by optical and digital microscopy. The acoustic parameters that can be diagnostic criteria characterizing a change in the steel state after preliminary cyclic loading have been determined, and their dependence on the relative number of cycles has been found. The changes in the form, spectrum, and median frequency of acoustic signals in steel samples are studied in the initial state and after preliminary cycling.

Specimens with V- and U-shaped notches made of austenitic high-nitrogen corrosion-resistant 05Kh20G10N3 AMF steel are subjected to impact tests in the temperature range from +20 to −196°C, and stress-