摘要
三维条件下双丝拉拔力学性能研究是纤维增强混凝土研究的重要基础。本文考虑双丝间的耦合作用和材料各相的细观非均匀性,建立了双丝拉拔混凝土三维模型,研究了界面弹性模量对双丝拉拔混凝土力学性能的影响以及界面的作用机理,获得了试件应力分布云图、声发射演化过程图、声发射–位移–荷载曲线,拟合了峰值荷载、相对韧度以及声发射能量与界面弹性模量的关系曲线。研究结果表明:低弹性模量的界面有利于缓和应力集中;双丝拉拔试件的强度和韧性均随界面弹性模量的增加而降低。
The coupling actions between fibers and meso-level heterogeneous distribution of interface mechanical parameters have been investigated in this paper. Numerical models for twin fibers pull-out test have been simulated by using finite element method. The influence of interface elasticity modulus on mechanical properties and mechanism of interface have been studied on twin fibers pull-out test specimens. The results include tensile stress distribution, AE evolution and load-AE-step curves. By adopting curve fitting method, the relationship between interfacial elasticity modulus and peak load, and relative toughness, and acoustic emission energy have been established. These results show that lower elastic modulus interface could help to reduce the stress concentration. In addition, with an increasing interfacial elasticity modulus, the strength and toughness decrease.
作者
张亚芳
高照
ZHANG Ya-fang GAO Zhao(School of Civil Engineering, Guangzhou University, Guangzhou 510006, China)
出处
《土木工程与管理学报》
北大核心
2017年第2期14-18,32,共6页
Journal of Civil Engineering and Management
基金
国家自然科学基金(51678170
51278136)
广州市科技创新平台资助项目(15180005)
关键词
界面弹性模量
双丝
应力分布
声发射
韧性
interfacial elasticity modulus
twinfibers
stress distribution
acoustic emission
toughness
作者简介
张亚芳（1966-），女，湖北黄石人，教授，博士，研究方向为纤维增强混凝土及细观力学（Email：zhangyafang2004@163．com）
