Abaqus implementation of coupled thermo-mechanical dual-horizon bond-based peridynamics for thermally induced fractures in thermal barrier coatings

Thermal barrier coatings (TBCs) are responsible for thermal insulation protection of engine turbine blades in the industrial gas turbines and aero-engines. However, it often suffers from the thermal shocks during the normal service, which may cause the performance loss and delamination failure of TBCs. Thus, it is significant to study the thermally induced fracture mechanisms of TBCs. To this end, we propose a coupled thermo-mechanical dual-horizon bond-based peridynamics (TM-DH-BPD) with the optimum mathematical expression of micro-thermal conductivity. Meanwhile, we develop the dual-horizon peridynamic finite element method (DHPD-FEM) along with two approaches of the implicit solver and explicit solver with mass scaling to effectively address the time scale gap of the coupled thermo-mechanical governing equations. Moreover, the two and three-dimensional TM-DH-BPD models have been firstly implemented in Abaqus UEL and VUEL subroutines. At last, the TM-DH-BPD model is used to investigate the thermally induced fracture mechanism of TBCs, the phenomena of the transverse cracking propagation, kinking in the top coat and its interaction with the TC/BC (Top coat/Bond coat) interfacial cracking observed in the experiment are well captured. The proposed TM-DH-BPD model and its dual-horizon finite element implementation in the commercial software may accelerate the pace of the theoretical researching and real-word application of peridynamics including the complex thermal shock cracking problems of TBCs.