In the paper consideration is given to the mesoscopic deformation and fracture mechanisms of coated materials under various loading conditions, which are revealed using the television-optical measuring complex TOMSC. Crack generation in the coating (surface hardened layer) and fragmented structure formation in the substrate material bulk take place near the main stress concentrator close to the specimen end and develop along the specimen as a nonlinear wave process. Their character is shown to strongly depend on the geometry of the 'coating (surface hardened layer) - substrate' interface. The qualitative criterion of fatigue prefracture at alternating cyclic bending is formulated. It is shown that in cyclic loading of a composition with harder coating the crucial role belongs to the formation of stress concentration zones and deformation localization on the 'coating - substrate' interface. Recommendations on optimizing the modes of coating deposition are put forward.
|Number of pages||17|
|Publication status||Published - 2005|
ASJC Scopus subject areas
- Nuclear and High Energy Physics
- Atomic and Molecular Physics, and Optics