沙漠砂PE纤维ECC的拉伸性能与本构模型研究
Study on Tensile Properties and Constitutive Model of Desert Sand PE Fiber ECC
郑志超 1韩风霞 2刘继颜1
作者信息
- 1. 新疆大学建筑工程学院,新疆乌鲁木齐 830017
- 2. 新疆大学建筑工程学院,新疆乌鲁木齐 830017;新疆建筑结构与抗震重点实验室,新疆乌鲁木齐 830017
- 折叠
摘要
采用中国新疆本地原材料沙漠砂替代部分天然砂,以聚乙烯(Polyethylene,PE)纤维掺量及水胶比为变量,进行超高韧性水泥基复合材料(Engineered Cementitious Composite,ECC)的单轴拉伸试验,分析不同材料组分对沙漠砂聚乙烯纤维超高韧性水泥基复合材料试件单轴拉伸性能的影响规律.通过对其单轴拉伸应力-应变关系的分析,考虑纤维掺量、水胶比参数变化,采用最小二乘法对其本构进行回归分析,在试件的强化阶段使用非线性曲线表示,建立沙漠砂聚乙烯纤维超高韧性水泥基复合材料的拉伸本构模型.结果表明:所建拉伸本构模型可以较好地预测PE-ECC的拉伸应力-应变关系,与试验结果吻合较好.
Abstract
Desert sand,a local raw material in Xinjiang of China,was used to partially replace natural sand.The uniaxial tensile test of ultra-high toughness cement-based composites was carried out with polyethylene fiber content and water-binder ratio as variables.The effects of different material components on the uniaxial tensile properties of desert sand polyethylene fiber ultra-high toughness cement-based composites were analyzed.Through the analysis of its uniaxial tensile stress-strain relationship,considering the changes of fiber content and water-binder ratio parameters,the least square method is used to perform regression analysis on its constitutive model.The nonlinear curve is used to represent the strengthening stage of the specimen,and the tensile constitutive model of desert sand polyethylene fiber ultra-high toughness cement-based composites is established.The results show that the tensile constitutive model proposed in this paper can better predict the tensile stress-strain relationship of PE-ECC,which is in good agreement with the experimental results.
关键词
PE纤维/沙漠砂/拉伸性能/本构模型/应力-应变曲线Key words
PE fibers/desert sand/tensile properties/constitutive model/stress-strain curve引用本文复制引用
基金项目
国家自然科学基金青年基金(51708479)
出版年
2024
国家科技期刊平台
NSTL
维普
万方数据