Size Effect of Mechanical Behavior of Coating Systems

Abstract eng:
The mechanical behaviour of coating systems with different thickness coatings were studied under in situ 3-point and 4-ponit bending experiments, and crack evolution was observed with load-displacement curves. Fracture and damage characteristics of the coating systems were analyzed, and a catastrophic damage model was introduced. The result indicates that fracture mode and damage propagation depend on the size of the coatings and loading condition, the interface fracture and shear failure dominate the thick coating systems under 3-ponit bending, and the multiple transverse cracks emergence and tensile failure dominate the thin coating systems under 3-ponit bending and both coating samples under 4-ponit bending. Furthermore, the damage of the thick coating systems is faster than that of the thin coating systems both under 3-ponit bending and 4-ponit bending, and the damage of both systems obeys the same power law behaviour with power exponent of 0.5 as the corresponding controlling variable increases.

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