| 引用本文: | 徐佰顺,姚亚东,常建梅,张长江,宋帅.受剪应力影响的CFRP-钢界面蠕变本构模型[J].哈尔滨工业大学学报,2021,53(3):170.DOI:10.11918/201912052 |
| XU Baishun,YAO Yadong,CHANG Jianmei,ZHANG Changjiang,SONG Shuai.Creep constitutive model of CFRP-steel interface under shear stress[J].Journal of Harbin Institute of Technology,2021,53(3):170.DOI:10.11918/201912052 |
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| 受剪应力影响的CFRP-钢界面蠕变本构模型 |
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徐佰顺1,2,姚亚东1,2,常建梅1,2,张长江1,宋帅3
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(1. 内蒙古大学 交通学院,呼和浩特 010070;2.内蒙古自治区桥梁检测与维修加固工程技术研究中心,呼和浩特 010070; 3.青岛理工大学 土木工程学院, 山东 青岛 266033)
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| 摘要: |
| 为研究碳纤维增强复合材料（CFRP）-钢界面胶粘剂的蠕变特性,开展不同拉伸荷载作用下CFRP-钢双剪试件的长期加载试验,分析CFRP应变分布规律及其随加载时间变化特点. 基于Burgers模型特性及胶层剪应变随时间变化规律给出了模型中各参数的求解方法. 根据试验数据拟合得到了Burgers模型和Findley幂律方程中各参数的表达式. 结果表明:在长期界面剪切应力作用下CFRP-钢界面胶粘剂发生了蠕变变形,CFRP应变从加载端到固定端非线性减小,其随加载时间增加而增大且增大速率逐渐减小；界面名义剪应力越高,胶粘剂蠕变变形越大,CFRP应变增加越多；Burgers模型中参数ηM和GK均是剪应力τ的一次函数,参数ηK是剪应力τ的二次函数；Findley幂律方程中参数m是剪应力τ的一次函数,参数n是剪应力τ的二次函数；Burgers模型和Findley幂律方程的均方根误差都很小,两类模型都能较好地预测胶粘剂的蠕变变形；当界面剪应力τ较高时,Burgers模型预测的胶粘剂蠕变变形与试验结果吻合程度要好于Findley幂律方程. |
| 关键词: CFRP-钢界面 胶粘剂 蠕变 本构模型 双剪试件 剪应力 |
| DOI：10.11918/201912052 |
| 分类号:TU391 |
| 文献标识码:A |
| 基金项目:国家自然科学基金(51808376)； 内蒙古自治区自然科学基金(2019BS05024)； 中国博士后科学基金(2019M651076) |
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| Creep constitutive model of CFRP-steel interface under shear stress |
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XU Baishun1,2,YAO Yadong1,2,CHANG Jianmei1,2,ZHANG Changjiang1,SONG Shuai3
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(1. Transportation Institute, Inner Mongolia University, Hohhot 010070, China; 2. Inner Mongolia Engineering Research Center of Testing and Strengthening for Bridges, Hohhot 010070, China; 3.School of Civil Engineering, Qingdao University of Technology, Qingdao 266033, Shandong, China)
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| Abstract: |
| To study the creep properties of the adhesive of carbon fiber reinforced polymer (CFRP)-steel interface, long-term loading tests of CFRP-steel double-lap specimens were carried out under different tensile loads, and the strain distribution law of CFRP and its changing characteristics with loading time were analyzed. Based on the characteristics of the Burgers model and the time-varying law of the shear strain of adhesive layer, a solving method for each parameter in the model was given. According to the experimental data, the expressions of the parameters in the Burgers model and the Findley power law equation were obtained. Results show that under the action of long-term interfacial shear stress, the adhesive of CFRP-steel interface had creep deformation, and the strain of CFRP decreased nonlinearly from loading end to fixed end, which increased with the increase of loading time and the increasing rate decreased gradually. The higher the value of interfacial nominal shear stress was, the larger the creep deformation of adhesive was, and the more the strain of CFRP increased. In the Burgers model, parameters ηM and GK were both linear functions of shear stress τ, and parameter ηK was a quadratic function of shear stress τ. In the Findley power law equation, parameter m was a linear function of shear stress τ, and parameter n was a quadratic function of shear stress τ. The root mean square errors of the Burgers model and the Findley power law equation were small, and both models could predict the creep deformation of the adhesive. When the interfacial shear stress τ was high, the creep deformation predicted by the Burgers model was better than that predicted by the Findley power law equation. |
| Key words: CFRP-steel interface adhesive creep constitutive model double-lap specimen shear stress |
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