Publication de 4 numéros par an
ISSN Imprimer: 2152-2057
ISSN En ligne: 2152-2073
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INFLUENCE OF THE COATING THICKNESS ON STRENGTH OF THE COATING−BASE MATERIAL COMPOSITE. NUMERICAL SIMULATION
RÉSUMÉ
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.