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Your search keyword '"Golovin, D. Yu."' showing total 38 results
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38 results on '"Golovin, D. Yu."'

25. Creep in wood studied via continuous naation ranging from nano- to macro-scale

Author

null Yunack M. A., null Vasyukova I. A., null Golovin D. Yu., null Tyurin A. A., null Gusev A. A., and null Golovin Yu. I.

Abstract

The paper presents the results of creep measurement in common pine wood at different scales ranging from nano to macro by means of continuous naation. It is shown that wood structure elements pertaining to different scale levels make different contribution to steady creep rate. Keywords: naation, wood, creep.

Published
2023

29. Distribution of mechanical properties in annual growth rings of deciduous trees measured using scanning naation

Author

null Vasyukova I. A., null Golovin D. Yu., null Matveev S. M., null Gusev A. A., null Tyurin A. I., and null Golovin Yu. I.

Abstract

The paper presents the results of mechanical properties scanning by means of naation across the annual growth rings of deciduous trees wood, small-leaved lime (Tilia cordata) and common oak (Quercus robur) in particular. Significant variations in microhardness H and Young's modulus E radial dependencies have been found for any of the studied species. Results can be useful 1) to amend the understanding the nature of macromechanical properties of various wood species and to reveal the details of their formation depending upon microstructural characteristics, 2) to optimize the technologies of growing, reinforcement and subsequent usage of the wood, 3) to develop new independent methods in dendrochronology and dendroclimatology Keywords: nanocomposites, naation, nano-/microhardness and Young's modulus scanning, tree annual growth rings, dendrochronology

Published
2022

30. Scanning naation as an instrument of studying local mechanical properties distribution in wood and a new technique for dendrochronology

Author

null Zakharova O. V., null Kolesnikov E. A., null Yunak M.A., null Vasyukova I. A., null Samodurov A. A., null Golovin D. Yu., null Matveev S. M., null Gusev A. A., null Tyurin A. I., and null Golovin Yu. I.

Abstract

The paper presents the results of scanning of mechanical properties of coniferous (common pine Pinus sylvestris) and deciduous (small-leaved lime Tilia cordata and common oak Quercus robur) trees wood using naation on crosscut face. Manifold increase in microhardness H and Young's modulus E has been observed between early and late wood in every annual growth ring. Significant differences in intraring radial dependencies of H and E have been found among studied species. For all studied species the average values of E and H of early wood in each annual ring are found to be independent from ring width, while such dependence for late wood is weak at most. The ring widths measured by naation coincide with the ones measured by standard optical method within 2-3%. The developed technique and obtained results can be useful 1) to amend the understanding the origins of macromechanical properties of various wood species and their dependence upon microstructural characteristics and growth conditions, 2) to optimize the technologies of growing, reinforcement and subsequent usage of the wood, 3) to develop new independent high resolution methods in dendrochronology. Keywords: naation, nano-/microhardness and Young's modulus scanning, tree annual growth rings, dendrochronology.

Published
2022

36. A New Technique for Thermal Nondestructive Testing by Means of Local Thermal Pulse.

Author

Golovin, Yu. I., Tyurin, A. I., Golovin, D. Yu., and Samodurov, A. A.

Subjects
THERMOGRAPHY, NONDESTRUCTIVE testing, HEAT transfer, LASER beams, MATERIALS science
Abstract

A new thermographic nondestructive testing technique employing local spot heating pulse is proposed and described. In a homogeneous and defect-free sample heating forms a radially symmetric thermal wave registered by a thermovision camera. An image data processing algorithm allowing the thermal conduction and temperature diffusivity of materials to be determined with an accuracy of about 2-3% has been developed and tested. Sample defects and inhomogeneities distort the circular shape of isotherms on the surface of the test object. The amplitude and shape of such distortions can serve as defect tracers. The proposed non-stationary thermal field data processing algorithm can be used to determine the location and geometry of defects on both the visible and hidden surfaces of the examined shell. [ABSTRACT FROM AUTHOR]

Published
2018
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