冻融循环对CFRP-烧结粘土砖界面粘结性能影响  

Effects of freeze-thaw cycles on interfacial bonding property of CFRP-sintered clay brick

作　　者：靳文强[1,2] 赵建昌[1,2] 王琦 郭乐乐 聂丹 JIN Wenqiang;ZHAO Jianchang;WANG Qi;GUO Lele;NIE Dan(School of Civil Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China;National and Provincial Joint Engineering Laboratory of Road Bridge Disaster Prevention and Control,Lanzhou Jiaotong University,Lanzhou 730070,China;China Railway Design Corporation,Tianjin 300308,China)

机构地区：[1]兰州交通大学土木工程学院,兰州730070 [2]兰州交通大学道桥工程灾害防治技术国家地方联合工程实验室,兰州730070 [3]中国铁路设计集团有限公司,天津300308

出　　处：《复合材料学报》2020年第9期2294-2302,共9页Acta Materiae Compositae Sinica

基　　金：甘肃省教育厅项目(2016A-017)。

摘　　要：为考察冻融循环对碳纤维增强聚合物复合材料(CFRP)-烧结粘土砖界面粘结性能的影响,通过模拟自然冻融环境,在试件经过不同次数的冻融循环后对其进行单面剪切试验。结果表明:在冻融循环作用下,CFRP-烧结粘土砖试件界面粘结性能发生了显著的退化,即随着冻融循环次数的增加,界面承载力和剪应力不断降低;界面剪应力在不同冻融次数下的分布具有相似性,均表现为随着荷载的增加剪应力逐渐由加载端向自由端传递,在传递过程中,有效传递长度变化不显著。在已有界面理论的基础上,根据试验提出了考虑冻融循环时间的界面粘结-滑移模型,通过对比分析,该模型能够很好地反映冻融循环作用下界面粘结性能退化规律。In order to investigate the effects of freeze-thaw cycles on the interface bonding performance of carbon fiber reinforced polymer composite(CFRP)-sintered clay brick,a single-sided shear test was conducted on the test specimens after different times of freeze-thaw cycles by simulating the natural freeze-thaw environment.The test results show that under the action of freeze-thaw cycles,the bond performance of the CFRP-sintered clay brick has been obviously degraded.Therefore,as the number of freeze-thaw cycles increases,the interface bearing capacity and shear stress continuously decrease.The distribution of the interface shear stress under different freeze-thaw times is similar,and they all show that the shear stress gradually passes from the loading end to the free end,while the effective transfer length doesn’t change significantly.Based on the existing interface theory,the interface bondslip model considering the freeze-thaw cycles was proposed according to the experiment.Through contrast analysis,the model can well reflect the degradation law of the interface bond performance under the action of freeze-thaw cycles.

关 键 词：冻融循环 CFRP 复合材料 粘土砖 粘结性能 耐久性 

分 类 号：TB332[一般工业技术—材料科学与工程]