Contact-driven delamination and spalling of coatings due to cyclic shock heatingстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 16 января 2019 г.
Аннотация:A new debonding mechanism taking into account crack face contact caused by a thermal gradient during laser heating is considered. The
contact renders double influence on the energy release rate G: it leads to sharp increase of G at convergence of two cracks and decreases
steady-state value of G. The first feature can explain the laser-induced spalling of thermal barrier coating under combined action of sintering
and heating. The inhomogeneous temperature through coating thickness under laser heating can induce contact-driven debonding leading to
the spalling under convergence of two cracks. The loading conditions of contact occurrence are derived. The simplified models of contactdriven
debonding are proposed and compared with finite element solution.