摘要
挂锚式碳纤维拉索因其挂锚区构造简单,在工程中具有良好的应用前景,但索端的有效锚固问题会影响材料强度的充分发挥。在材料拉伸试验基础上,对7根挂锚式碳纤维增强复合材料层合环带索进行单向拉伸试验,利用数字散斑技术,对试件的应变场变化、破坏形态以及拉伸强度进行测试。试验结果表明:未加紧固装置的试件承载力较小,破坏形式出现层间撕裂现象;加装紧固件后,随着拉伸载荷的增大,基体微损伤及基体与纤维界面的粘接破坏不断累积,载荷-位移曲线呈齿状波动线型,最终出现挂锚区横向断裂和索结构整体拉伸破坏两种模式。解析结果表明,挂锚区碳纤维横向受力状态由楔形角θ和紧固件横向约束力共同影响,是决定索结构破坏模式的关键因素。最后,利用ABAQUS对挂锚区提前破坏模式进行准静态拉伸仿真模拟,进一步分析了挂锚区提前破坏形态的发展过程。
The pin-anchored carbon fiber reinforced polymers(CFRP)cable member has promising application in structure engineering for its simple structural construction.However,the effective anchorage of cable end would interrupt its full tensile capacity for premature failure in anchorage zone.In this work,tensile mechanical test was conducted with seven pin-anchored CFRP laminated loop straps to investigate the failure mechanism,ultimate tensile capacity and nonuniform stress in pin-anchored zone with the help of the digital image correlation(DIC)technology.The test results show that the fixture is crucial to the development of the tensile properties and failure mode of the strap cables.One no-fixture specimen was subjected to laminar tear;and the rest six strap cables showed nonlinear development in the load-displacement curves during tensile loading process,in which the microdamage of matrix and the adhesion failure of matrix and fiber interface accumulated continuously.Analysis explained the mechanism that the wedge angleθand transverse binding force provided by the fixture were crucial in two structural failure modes of the cables.Finally,finite element analysis was carried out with quasi-static tensile simulation technique in ABAQUS to monitor the non-uniform stress in lamination layers up to the premature failure in anchor zone.
作者
雷家艳
赵道华
孔庆辉
章龙斌
张淇瑞
LEI Jiayan;ZHAO Daohua;KONG Qinghui;ZHANG Longbin;ZHANG Qirui(School of Architecture and Civil Engineering,Xiamen University,Xiamen 361005,China;Fujian Key Laboratory of Digital Simulations for Coastal Civil Engineering,Xiamen 361005,China)
出处
《复合材料科学与工程》
北大核心
2025年第11期103-109,共7页
Composites Science and Engineering
基金
国家自然科学基金联合基金项目(U2005216)。
关键词
碳纤维层合材料
环带
挂锚
拉伸性能
索结构
复合材料
carbon fiber reinforced polymer lamination
strap
pink-anchored
tensile properties
cable structure
composites
