摘要
针对形状记忆合金(SMA)纤维端部形式、直径、深径比(粘结长度/纤维直径)3个因素设计制作了5组试件,通过位移控制加载进行拉拔试验,分析了破坏形态、拉拔应力-应变曲线、平均粘结强度以及纤维利用率等性能,并比较了各因素对其与高延性水泥基复合材料(ECC)粘结力学性能的影响。基于试验结果,对SMA纤维在ECC中的破坏模式和粘结-滑移机理进行分析。结果表明,SMA纤维拉拔应力-位移曲线分为弹性阶段、脱粘阶段、马氏体相变阶段以及马氏体硬化阶段,直型端部SMA纤维直径和深径比的增大均会降低界面间粘结力,而N型端部SMA纤维端部锚固力能够有效改善界面间粘结性能和提高纤维利用率。
According to the three factors of SMA fiber end form,diameter and depth-diameter ratio(bonding length/fiber diameter),5 groups of specimens were designed and manufactured.The direct pull-out test of each group of specimens was carried out by displacement control loading.The failure morphology,tensile stress-strain curve,average bond strength,and fiber utilization rate were analyzed,and the effects of various factors on the bond mechanical properties with high ductility cement-based composite materials(ECC)were compared.Based on the test results,the failure mode and bond-slip mechanism of SMA fibers in ECC were analyzed.The results show that the drawing stress-displacement curve of SMA fibers is divided into four stages,namely elastic stage,debonding stage,martensitic transformation stage and martensitic hardening stage.An increase in the diameter and aspect ratio of straight end SMA fibers will reduce the interfacial bonding force,while the anchoring force at the end of the N-type end SMA fiber can effectively improve the interfacial bonding performance and improve the fiber utilization rate.
作者
付青石
杨曌
熊浩
汪裕章
董舒娅
FU Qingshi;YANG Zhao;XIONG Hao;WANG Yuzhang;DONG Shuya(School of Urban Construction,Wuhan University of Science and Technology,Wuhan 430065,China;Institute of High Performance Engineering Structure,Wuhan University of Science and Technology,Wuhan 430065,China)
出处
《新型建筑材料》
2023年第8期52-58,共7页
New Building Materials
基金
国家自然科学基金项目(52178158)
湖北省自然科学基金项目(2019CFB540)
国家级大学生创新创业训练计划项目(202110488009)。
关键词
形状记忆合金纤维
高延性水泥基复合材料
纤维拔出行为
界面粘结性能
shape memory alloy fiber
high ductility cement-based composite materials
fiber pull-out behavior
interfacial bonding performance
