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Composites: Mechanics, Computations, Applications: An International Journal

ISSN Print: 2152-2057
ISSN Online: 2152-2073

Composites: Mechanics, Computations, Applications: An International Journal

DOI: 10.1615/CompMechComputApplIntJ.v1.i1.60
pages 81-93

INFLUENCE OF THE COATING THICKNESS ON STRENGTH OF THE COATING−BASE MATERIAL 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

ABSTRACT

Special features of deformation and fracture of a material with coating of different thickness in tension have been investigated. The boundary-value problem in the plane-strain formulation is solved numerically by the finite-difference method. In calculations, a composite structure is taken into account explicitly. It is found that for thick coatings, a value of stress concentration near the "coating−base material" interface does not change with changes in the coating thickness whereas in the region of small thicknesses it increases nonlinearly with a decrease in the coating thickness. This effect is observed at the elastic stage of composite deformation, it enhances as plastic deformation develops in the base material, and amounts to 25% at the prefracture stage. Recommendations that could be useful for optimization of the coating thickness are given.