Peridynamic modeling of dual-phase-lag thermal-moisture coupling in a finite element framework

This study presents a peridynamic (PD) modeling approach for non-Fourier heat conduction and non-Fickian moisture concentration in a finite element framework by considering MATRIX27 elements native to ANSYS. The thermal and moisture fields are coupled in the form of Dual-Phase-Lag (DPL) models to resolve the issue of propagation of thermal wave and mass of moisture with infinite speed. The nonlocal effects arising from thermal inertia, moisture inertia and microstructural interaction are included through the PD form of coupled thermal and moisture field equations. The nonlocal PD theory involves integral equations without smoothness requirement of the field variable. The PD thermal and hygro bonds enable the exchange of thermal energy and moisture concentration between nodes. The efficacy of this approach is established by considering heat conduction in a nanoscale metal film and a plate with an insulated crack, and a bar of homogeneous and nonhomogeneous material subjected to sudden pulse of coupled thermal and moisture conditions.