Transient Response of Fine-Grained Piezoelectric Coating Composite Structures with a Griffith-Type Interface Crack Under Thermal Impact Loading

Transient behavior of a Griffith interface crack in fine-grained piezoelectric coating/substrate under thermal impact loading conditions is investigated. It is assumed that the crack faces are thermally and electrically insulated. By employing Fourie–Laplace integral transforms as well as the additivity of solutions, the theoretical expressions for the temperature field, displacement field, and electric field are constructed, thereby deriving specific expressions for the dynamic intensity factors of thermal stress and electric displacement. The boundary-value problem is reduced to singular integral equations solved numerically. Parametric studies quantify time-dependent effects of the coating elastic modulus, thickness, and crack length on dynamic responses. Numerical analyses demonstrate that variations in the elastic modulus ratio and coating thickness induce varied increases or decreases in peak dynamic stress intensity factor. Optimizing coating thickness and elastic modulus significantly enhances structural safety under thermal impact loading.