初始缺陷对非均质SFRCC单向受拉特性影响细观分析  

Mesoscopic analysis of the influence of initial defects onthe one-way tensile characteristics of heterogeneous SFRCC

作　　者：康冠英 柴军瑞[1] 杨毅[2] 覃源[1] 王文杰 曹靖[1] 苏江霞 KANG Guanying;CHAI Junrui;YANG Yi;QIN Yuan;WANG Wenjie;CAO Jing;SU Jiangxia(State Key Laboratory of Eco-hydraulics in Northwest Arid Region,Xi'an University of Technology,Xi'an 710048,China;Shaanxi Key Laboratory of Safety and Durability of Concrete Structures,Xijing University,Xian 710123,China;China Coal Science and Industry Xi'an Research Institute(Group)Co.,Ltd.,Xi'an 710061,China;Ningxia Water Conservancy and Electricity Survey and Design Institute Co.,Ltd.,Yinchuan 750004,China)

机构地区：[1]西安理工大学省部共建西北旱区生态水利国家重点实验室,西安710048 [2]西京学院陕西省混凝土结构安全与耐久性重点实验室,西安710123 [3]中煤科工西安研究院(集团)有限公司,西安710061 [4]宁夏水利水电勘测设计研究院有限公司,银川750004

出　　处：《功能材料》2024年第11期11164-11173,共10页Journal of Functional Materials

基　　金：国家自然科学基金重点项目(52009108);国家自然科学基金重点项目(51679197);陕西省创新团队(2022TD-01)。

摘　　要：初始缺陷会对钢纤维增强水泥基复合材料(SFRCC)的力学性能产生较大影响。通过参数化语言,建立了由钢纤维、水泥砂浆基体及界面过渡区构成的二维SFRCC模型,布置了界面、砂浆、表面和三处同时存在的四种初始缺陷类型,并结合Weibull分布函数建立非均质模型,模拟了不同初始缺陷下非均质SFRCC试件单轴拉伸破坏的过程。结果表明:不同类型初始缺陷对不同平均方向效应系数SFRCC材料抗拉强度影响程度不同;探究了不同类型初始缺陷对SFRCC材料细观单元力学性能的影响;揭示了非均质SFRCC材料存在不同初始缺陷时的拉伸损伤过程及破坏机理。Initial defects can have a large impact on the mechanical properties of steel fiber reinforced cementitious composites(SFRCC).In this paper,a two-dimensional SFRCC model consisting of steel fibers,cement mortar matrix and interface transition zone is established through parametric language,four types of initial defects at the interface,mortar,surface and three simultaneous existences are arranged,and a nonhomogeneous model is established in combination with Weibull distribution function to simulate the uniaxial tensile damage of nonhomogeneous SFRCC specimens under different initial defects.The results show that different types of initial defects affect the tensile strength of SFRCC materials with different mean directional effect coefficients to different degrees.The effects of different types of initial defects on the mechanical properties of SFRCC materials in the fine unit are investigated,and the tensile damage process and damage mechanism of non-homogeneous SFRCC materials in the presence of different initial defects are revealed.

关 键 词：钢纤维增强水泥基复合材料 初始缺陷 非均质 细观 数值模拟 

分 类 号：TU528.572[建筑科学—建筑技术科学]