摘要
通过实验分析2种PVA纤维(纤维A和纤维B)与水泥基体的界面力学行为,探讨其对应变硬化水泥基复合材料(SHCC)拉伸性能的影响。由单丝拔出实验得出,纤维A和纤维B滑移开始时的界面剪切应力分别为3.79和1.82 MPa,且界面断裂能分别为1.16和10.18J/m2。纤维A在滑移阶段的强化效应优于纤维B,纤维A配制的SHCC延性更好。预制缺口的SHCC试样在裂纹扩展阶段,纤维A桥联作用的刚度较大,控制裂纹张开的能力较强。含纤维A和纤维B的试样在裂纹张开过程中的余能分别为154.47和407.24J/m2,最大桥联应力分别为4.56和4.12 MPa,满足水泥基复合材料裂纹稳态扩展准则。
The interface mechanical behaviors of two types of PVA fibers(Fiber A and Fiber B)and cement ma-trix are compared so as to investigate their effects on tensile properties of strain hardening cementitious compos-ites(SHCC).By means of the single fiber pullout test,the interfacial shear stress at the beginning of slip of Fi-ber A and Fiber B are3.79and1.82MPa,respectively,while the interfacial fracture energy are1.16and10.18J/m2,respectively.The slip hardening effect happened on Fiber A is more effective than that on Fiber B,so tensile strength and ductility of SHCC containing Fiber A are higher than that containing Fiber B.During the crack propagation stage of the notched SHCC specimen,Fiber A has higher bridging stiffness than Fiber B im-plying Fiber A exhibits better ability to control the opening of cracks.Complementary energy of the notched SHCC specimens containing Fiber A and Fiber B during the crack opening are154.47and407.24J/m2,respec-tively,while the maximum bridging stress are4.56and4.12MPa,respectively,which satisfy the criterions for steady state multiple cracking.
作者
韦云雱
孙明清
王应军
WEI Yunpan;SUN Mingqing;WANG Yingjun(Hubei Key Laboratory of Theory and Application of Advanced Materials Mechanics ,Wuhan University of Technology, Wuhan 430070,China;Hengrun Group Co. Ltd. ,Hengshui 053100, China)
出处
《功能材料》
EI
CAS
CSCD
北大核心
2017年第8期164-169,共6页
Journal of Functional Materials
基金
湖北省自然科学基金资助项目(2014CFB866)
河北省百人计划资助项目(E2014100003)
关键词
高延性
水泥基复合材料
界面性能
滑移强化
桥联应力
high-ductility
cement-based composites
interface behavior
slip hardening
bridging stress
