氯盐侵蚀环境下液体橡胶改性CFRP-钢界面耐久性
Durability of CFRP-steel interface modified by liquid rubber under chlorine salt erosion
庞育阳 1吕远晨 1王强2
作者信息
- 1. 郑州大学 土木工程学院,郑州 450001
- 2. 河北工业大学 土木与交通学院,天津 300401
- 折叠
摘要
设计了 54个碳纤维增强树脂复合材料(CFRP)-钢双搭接试件,研究了液体橡胶改性剂掺量和腐蚀龄期对CFRP-钢改性界面在高温水浴和常温干湿循环两种氯盐侵蚀作用后力学性能的影响.结果表明:在高温水浴及常温干湿循环作用下未改性试件分别呈现CFRP层间剥离破坏和钢/粘结剂界面剥离破坏,而液体橡胶改性试件可将破坏模式转变为粘结剂内聚破坏,其中 10wt%液体橡胶提升界面耐久性效果最优,在高温水浴和常温干湿循环氯盐侵蚀 180天后,试件极限荷载保留率相较未改性试件分别提升了 28.11%和 29.94%.基于试验结果,建立了适用于两种氯盐侵蚀环境下的改性界面粘结-滑移模型,模型预测结果与试验结果吻合较好.
Abstract
Fifty-four carbon fiber reinforced resin composite(CFRP)-steel double lap specimens were designed to study the effects of liquid rubber modifier content and corrosion age on the mechanical properties of CFRP-steel modified interface under the erosion of two kinds of chlorine salts:High temperature water bath and dry-wet cycles at normal temperature.The results show that under the action of high temperature water bath and dry-wet cycles at normal temperature,the unmodified specimens show CFRP interlayer stripping failure and steel/binder interface stripping failure,respectively,while the liquid rubber modified specimens could transform the failure mode into adhesive cohesion failure,among which 10wt%liquid rubber has the best effect on improving interface durability.After 180 days of high temperature water bath and dry-wet cycles chloride salt erosion at normal temperature,the ultimate load retention rates of the specimens increase by 28.11%and 29.94%,respectively,compared with that of the unmodified specimens.Based on the experimental results,modified interface bond-slip models are established which are suitable for two kinds of chlorine salt erosion environments,and the predicted results are in good agree-ment with the experimental results.
关键词
氯盐侵蚀/液体橡胶改性/CFRP加固钢板/粘结-滑移关系/耐久性Key words
chloride erosion/liquid rubber modification/CFRP reinforced steel plate/bond-slip relationship/durability引用本文复制引用
基金项目
国家自然科学基金(52008377)
中国博士后科学基金(2021M692940)
河北省自然科学基金(E2023202048)
出版年
2024
NETL
NSTL
万方数据