Temperature Fatigue Characteristics of Tile-Mortar Interface Based on Fatigue Cohesive Zone Model

A coupling model of fatigue damage evolution and cohesive zone equations was developed to simulate the damage behaviors of tile‑mortar interface under various temperature loadings. The effects of temperature variation amplitudes，cyclic times and mortar thickness on the interface damage were analyzed. Results show that the proposed fatigue cohesive zone model is feasible for the simulation of damage behaviors of tile‑mortar interface under temperature cycles. The interface damage is mainly caused by the shear movements between the tile and mortar. The effect of cooling is much greater than that of heating on the interface damage. With increasing temperature cycles，the interface damage initiates at the edge of tile，and extends to the middle of tile in a decreasing growth rate. Increases of temperature variation amplitudes and a sudden thickening of mortar will accelerate the initiation and evolution of interface damage. The damage generating by the sudden thickening of mortar mainly appears in the thicker side. © 2023 Tongji University. All rights reserved.