L. M. Devin, P. M. Lytvyn, S. O. Ivakhnenko, O. O. Zanevskyi
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引用次数: 0
Abstract
The behavior of type IIa HTHP single crystal diamonds under shock loads created by means of Hopkinson–Kolsky pressure bars is studied. Controlled variation of load pulse magnitude and duration makes it possible to trace the complete history of crack progression. It ranges from crack initiation in regions of peak stress, through rapid crack propagation and the formation of a smooth surface, to stable crack growth accompanied by the formation of a densely packed array of fine ridges, and eventually to a deceleration and discontinuous crack movement, which culminate in a stepped structure upon the completion of step formation. Atomic force microscopy is employed to reveal the topographic characteristics of the fracture surface with spanning dimensions from 3 to 600 nm. The three-dimensional distribution of equivalent von Mises stresses throughout the entire crystal and respective crystal fragments after brittle fracture is also simulated in the study.
期刊介绍：
Journal of Superhard Materials presents up-to-date results of basic and applied research on production, properties, and applications of superhard materials and related tools. It publishes the results of fundamental research on physicochemical processes of forming and growth of single-crystal, polycrystalline, and dispersed materials, diamond and diamond-like films; developments of methods for spontaneous and controlled synthesis of superhard materials and methods for static, explosive and epitaxial synthesis. The focus of the journal is large single crystals of synthetic diamonds; elite grinding powders and micron powders of synthetic diamonds and cubic boron nitride; polycrystalline and composite superhard materials based on diamond and cubic boron nitride; diamond and carbide tools for highly efficient metal-working, boring, stone-working, coal mining and geological exploration; articles of ceramic; polishing pastes for high-precision optics; precision lathes for diamond turning; technologies of precise machining of metals, glass, and ceramics. The journal covers all fundamental and technological aspects of synthesis, characterization, properties, devices and applications of these materials. The journal welcomes manuscripts from all countries in the English language.
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