DESTRUCTION OF THIN FILMS WITH A DAMAGED SUBSTRATE AS A RESULT OF WAVES LOCALIZATION CAUSED BY PERIODIC IMPACT

Abstract eng:
The present paper is devoted to an issue of possible localization of waves propagating within a structure that consists of a film connected to a backing material through a substrate. The substrate is initially damaged.In the first approximation the film model in the present paper is assumed to be a string on an elastic foundation with a coefficient depending on the substrate damage degree. The elastic foundation imitates the substrate and backing material effects on the film.Initiation of a string delamination resulted from the structure damaged at localized oscillations caused by a periodic impact load has been considered.At loading the initial damage of the substrate is changing in time and space according to the proposed law of the damage growth.It has been shown that at impact the cause of the string substrate material damage increase can be localized oscillation modes. The localized mode existence depends on relation between the initial substrate rigidity and the main material rigidity.There is also possible a passage through a sequence of resonances under the action of a periodic impact force.

• Export as: BibTeX | MARC | MARCXML | DC | EndNote | NLM | RefWorks
• Add to your basket