Coupled Thermo-Mechanical Peridynamics Simulation for Analyzing Failure of ECC Under High-Temperature Loads

In this paper, the degradation of mechanical properties of engineering cementitious composites (ECCs) at elevated temperatures and the failure of fiber are considered. A failure model under coupled thermo-mechanical loads for ECC is developed based on bond-based peridynamics. A semi-discrete model is constructed to describe fiber–matrix interactions and simulate thermal failure in ECC. The peridynamic differential operator (PDDO) is utilized for non-local modeling of thermal fluid flow and heat transfer. A multi-rate explicit time integration method is adopted to address thermo-mechanical coupling over different time scales. Model validation is achieved through simulating transient heat transfer in a homogeneous plate, with results aligning with analytical solutions. The damage behavior of a heated ECC plate in a borehole and under a fire scenario is analyzed, providing insights for enhancing fire resistance and high-temperature performance of ECC materials and structures.