不同加载速率下高性能水泥基复合材料断裂性能研究

doi:10.11896/cldb.20090034

材料导报

2021, Vol. 35

Issue (22): 22051-22056 https://doi.org/10.11896/cldb.20090034

无机非金属及其复合材料

不同加载速率下高性能水泥基复合材料断裂性能研究

宣卫红¹, 徐文磊², 陈育志¹, 陈徐东², 程熙媛²

1 金陵科技学院建筑工程学院,南京 211169
2 河海大学土木与交通学院,南京 210098

Study on Fracture Properties of High-performance Cement-based Composites Under Different Loading Rates

XUAN Weihong¹, XU Wenlei², CHEN Yuzhi¹, CHEN Xudong², CHENG Xiyuan²

1 School of Architectural Engineering, Jinling Institute of Technology, Nanjing 211169, China
2 College of Civil and Transportation Engineering, Hohai University, Nanjing 210098, China

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摘要为研究加载速率对高性能水泥基复合材料(High-performance cement-based composites,HPCC)断裂性能的影响,本研究对带预制裂缝的HPCC矩形梁进行了三点弯曲测试。以裂缝嘴张开位移(Crack mouth opening displacement,CMOD)为加载控制参数,加载速率分别为0.001 mm/s、0.01 mm/s和0.1 mm/s,试件内钢纤维体积掺量分别为0%和2%(均为质量分数)。基于荷载-裂缝嘴张开位移(P-CMOD)曲线分析了第一裂纹应力、弹性模量、弯曲强度、失稳韧度以及断裂能等一系列断裂特征参数随加载速率的变化规律。试验结果表明:(i)第一裂纹应力和弹性模量几乎不受钢纤维含量和加载速率的影响;(ii)HPCC弯曲强度与应变率比呈对数关系,且含钢纤维HPCC的弯曲强度率效应更明显;(iii)含钢纤维HPCC的失稳韧度和断裂能有很大程度的提升,但其对加载速率的敏感性较低。掺钢纤维能够有效提高HPCC材料抵抗冲击荷载的能力。

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关键词: 高性能水泥基复合材料(HPCC) 钢纤维断裂加载速率 P-CMOD

Abstract: To study the effect of loading rate on the fracture properties of high-performance cement-based composites (HPCC), three-point bending tests were carried out on HPCC using notched rectangular beams. The crack mouth opening displacement (CMOD) was used as the loa-ding control parameter. The loading rates were 0.001 mm/s, 0.01 mm/s and 0.1 mm/s respectively, and the volume fraction of steel fiber was 0% and 2%.A series of fracture characteristic parameters such as first crack stress, elastic modulus, bending strength, unstable fracture toughness and fracture energy were analyzed based on the P-CMOD curves. The experiment results show that: (i) the first crack stress and elastic modulus are almost independent of the steel fiber content and loading rate; (ii) the bending strength of HPCC is logarithmically related to the strain rate ratio, and the bending strength of HPCC with steel fiber is more sensitive to the loading rate; (iii) the unstable fracture toughness and fracture energy of HPCC with steel fiber are greatly improved, but the sensitivity to loading rate is relatively low. Steel fiber can effectively improve the ability of HPCC material to resist impact load.

Key words: high-performance cement-based composites (HPCC) steel fiber fracture loading rate P-CMOD

出版日期: 2021-11-25 发布日期: 2021-12-13

ZTFLH:

TU528.572

基金资助: 江苏省自然科学基金(BK20181114)

通讯作者: xwh@jit.edu.cn

作者简介: 宣卫红,金陵科技学院建筑工程学院院长,教授。2010年12月毕业于河海大学结构工程专业,博士学位。主要从事纤维水泥基复合材料力学性能及工程应用研究。在国内外重要期刊发表论文20多篇,获专利授权20余项。

引用本文:

宣卫红, 徐文磊, 陈育志, 陈徐东, 程熙媛. 不同加载速率下高性能水泥基复合材料断裂性能研究[J]. 材料导报, 2021, 35(22): 22051-22056.
XUAN Weihong, XU Wenlei, CHEN Yuzhi, CHEN Xudong, CHENG Xiyuan. Study on Fracture Properties of High-performance Cement-based Composites Under Different Loading Rates. Materials Reports, 2021, 35(22): 22051-22056.

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http://www.mater-rep.com/CN/10.11896/cldb.20090034 或 http://www.mater-rep.com/CN/Y2021/V35/I22/22051

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