Zusammenfassung:
<jats:p>The brittle coatings, made of different materials, when subjected to elevated
temperatures and in the heat exchange conditions, are susceptible to
delamination. Those coatings, as well as thin films, can be used for various
thermo insulating deposits, e.g. in turbines of thermal power plants., In
layers made of different materials, due to the environmental temperature
change, thermal stresses appear as a consequence of a difference in their
thermal expansion coefficients. In this paper driving forces were analyzed
causing delamination of one layer from the other, i.e. the interfacial
fracture in the two-layered, bimaterial sample. This analysis was limited to
considering the sample behavior when exposed to the stationary temperature
field. The energy release rate G, which is the driving force for this
interfacial fracture, is changing with temperature and that variation is
increasing with increase of the temperature difference between the
environment and the sample. Analysis of this relation can be used to predict
the maximal temperature difference, which the two-layered sample can be
subjected to, without appearance of delamination between layers.</jats:p>
Beschreibung:
<jats:p>The brittle coatings, made of different materials, when subjected to elevated
temperatures and in the heat exchange conditions, are susceptible to
delamination. Those coatings, as well as thin films, can be used for various
thermo insulating deposits, e.g. in turbines of thermal power plants., In
layers made of different materials, due to the environmental temperature
change, thermal stresses appear as a consequence of a difference in their
thermal expansion coefficients. In this paper driving forces were analyzed
causing delamination of one layer from the other, i.e. the interfacial
fracture in the two-layered, bimaterial sample. This analysis was limited to
considering the sample behavior when exposed to the stationary temperature
field. The energy release rate G, which is the driving force for this
interfacial fracture, is changing with temperature and that variation is
increasing with increase of the temperature difference between the
environment and the sample. Analysis of this relation can be used to predict
the maximal temperature difference, which the two-layered sample can be
subjected to, without appearance of delamination between layers.</jats:p>