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合成材料:力学,计算和应用
ESCI SJR: 0.193 SNIP: 0.497 CiteScore™: 0.39

ISSN 打印: 2152-2057
ISSN 在线: 2152-2073

合成材料:力学,计算和应用

DOI: 10.1615/CompMechComputApplIntJ.v3.i4.10
pages 283-305

THE INFLUENCE OF LUDERS FRONT PROPAGATION ON THE STRENGTH OF THE "COATING-SUBSTRATE" COMPOSITE. NUMERICAL SIMULATION

Ruslan R. Balokhonov
Institute of Strength Physics and Materials Science, Siberian Branch of the Russian Academy of Sciences, Tomsk, Russian Federation
V. A. Romanova
Institute of Strength Physics and Materials Science, Siberian Branch of the Russian Academy of Sciences, Tomsk
Siegfried Schmauder
Materials Testing Institute (IMWF), University of Stuttgart, Stuttgart 70569, Germany
E. A. Schwab
Institute of Strength Physics and Materials Science, Siberian Branch of the Russian Academy of Sciences, Tomsk, Russian Federation
S. A. Martynov
Institute of Strength Physics and Materials Science, Siberian Branch of the Russian Academy of Sciences, 634021 Tomsk, Russian Federation

ABSTRACT

Processes of propagation of localized plastic deformation fronts in a material with boride coating have been investigated. The boundary-value dynamic problem is solved in the plane-strain formulation. Numerical simulation is performed by the finite-difference method. In calculations the microstructure of the composite is taken into account explicitly and corresponds to that observed experimentally. The constitutive equations for the steel substrate include an elastoplastic model with isotropic strain hardening taking into account a relation to describe slow flows. Deformation and fracture of the coated material under external compression is shown to be controlled by the appearance of local regions of tension along the interface. An interaction and interplay between nonhomogeneous plastic deformation in the steel substrate and crack origination and growth in the coating are studied. Cracking patterns, location of the fracture onset, and volume fraction of failed material are found to depend on the velocity of Luders front propagation.