Strain localization under impulse load

• Main Authors: S.N. Buravova, E.V. Petrov
• Format: Article
• Language: English
• Published: Elsevier 2021-09-01
• Series: Forces in Mechanics
• Subjects: Shock wave; Unloading; Strain localization; Mass transfer; Spall; Oscillations
• Online Access: http://www.sciencedirect.com/science/article/pii/S2666359721000068

Unknown characteristics of the strain localization process are determined by the study of the structure of localized strain bands and adjacent matrix metal. Interference of oncoming waves (compression and unloading) reflected from the sample faces are shown to induce oscillations of the sample in the standing wave mode at the nodes of which the localized strain bands (precursors of damage) arise. Strain localization is accompanied by the formation of a flow of particles (interstitial and substitution atoms, fine particles of the doping phase, and impurities), which migrate from the matrix to the zone of spall damage. The main property of a standing wave, namely, capability of preventing energy exchange through the nodal points, provides a long-term sample deformation after the shock wave front passed. The distance passed by the particles under impulse load exceeds the drift of particles under quasi-static load by several orders of magnitude.