基于疲劳内聚力模型的瓷砖-砂浆界面温度疲劳特性分析

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

摘要:

建立了疲劳损伤演化与内聚力耦合模型，模拟了不同温度循环作用下瓷砖-砂浆的界面损伤行为，并分析了温度变化幅值、作用次数和砂浆厚度对损伤的影响规律. 结果表明：疲劳内聚力模型可较好地模拟温度循环作用下瓷砖-砂浆的界面损伤行为；瓷砖-砂浆的界面损伤主要源于二者在界面处的剪切变形，且降温的影响远大于升温；随着温度作用次数的增加，界面损伤从瓷砖边缘处萌生并逐渐向中心扩展，但损伤增长速率逐渐降低；温度变化幅值增加和砂浆厚度突变均会加剧界面损伤及其发展速率，且砂浆厚度突变导致的界面损伤主要集中在较厚侧.

Abstract:

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.