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针对海工建筑物混凝土-环氧涂层界面气泡初始损伤在波浪作用下加速演化，进而导致涂层发生力学剥蚀的问题，本文基于内聚力模型基本理论，二次开发内聚力单元，建立环氧涂层-混凝土基体界面初始损伤内聚力模型，模拟规则波作用下界面疲劳损伤过程，分析规则波作用下气泡生成角度、面积和偏心率等因素对初始损伤演化的影响。结果表明，涂层界面初始损伤的扩展演化分为损伤演化前、疲劳累积和损伤扩展三个阶段：初始损伤演化前，初始损伤动力响应集中于气泡底部尤其是半短轴边缘部位；疲劳累积阶段，半短轴边缘疲劳损伤累积呈阶梯式增长，半短轴边缘脱黏失效后，半长轴疲劳损伤迅速累积并发生脱黏失效；脱黏扩展阶段，脱黏区域从气泡初始损伤底部向外扩展，半短轴脱黏速率大于半长轴，最终形成圆形脱黏区域。随着气泡面积和偏心率的增加，内聚力单元最大应力和最大应变增大，涂层脱黏历时缩短；随着气泡生成角度增加，气泡底部内聚力单元最大应变逐渐减小，底部内聚力单元的应变集中效应减弱，涂层脱黏历时增长。
Abstract：The initial bubble damage at the interface of concrete-epoxy coating of Marine buildings accelerates evolution under the action of waves, which leads to mechanical erosion of the coating. Based on the basic theory of cohesion model, the cohesion unit was developed again, and the initial damage cohesion model of epoxy coating-concrete matrix interface was established to simulate the interface fatigue damage process under the action of regular waves. The effects of bubble formation angle, area and eccentricity on the initial damage evolution under the action of regular waves were analyzed. The results showed that the expansion evolution of the initial damage at the coating interface is divided into three stages: pre-damage evolution, fatigue accumulation and damage expansion. Before the initial damage evolution, the dynamic response of the initial damage is concentrated at the bottom of the bubble, especially at the edge of the semi-minor axis. After the semi-minor axis edge debonding failure, the fatigue damage of the semi-major axis accumulates rapidly and the debonding failure occurs. In the debonding expansion stage, the debonding area expands outward from the bottom of the initial bubble damage, and the debonding rate of the semi-minor axis is greater than that of the semi-major axis, finally forming a circular debonding area. With the increase of bubble area and eccentricity, the maximum stress and strain of cohesion unit increased, and the coating debonding time shortened. With the increase of bubble formation angle, the maximum strain of the cohesion unit at the bottom of the bubble decreases gradually, the strain concentration effect of the cohesion unit at the bottom of the bubble weakens, and the coating debonding time increases. Therefore, if the initial bubble damage area can be reduced during construction, and the eccentricity and generation degree of bubbles can be controlled, the service life of the coating can be effectively prolonged.
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基本信息:
DOI：10.16441/j.cnki.hdxb.20220439
中图分类号:P75;P731.22
引用信息:
[1]常留红,郭洋,郑景琦,等.规则波作用下混凝土-环氧涂层界面气泡初始损伤演化[J].中国海洋大学学报(自然科学版),2025,55(02):138-148.DOI:10.16441/j.cnki.hdxb.20220439.
基金信息:
国家自然科学基金项目(51809022); 湖南省自然科学基金项目(2021JJ30703)资助~~
2022-10-19
2022
2022-11-24
2022
1
2025-01-14
2025-01-14