A sawtooth constitutive model describing strain hardening and multiple cracking of ECC under uniaxial tension

IF 3.6 4区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY
Lingyu Li, Hongkang Chen, Hongfa Yu, Haiyan Ma, Haotian Fan, Xiaoqing Chen, Yuning Gao
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引用次数: 0

Abstract

By collecting engineered cementitious composite (ECC) uniaxial tensile experimental research data, aiming at the multiple cracking characteristics of the strain hardening stage of the ECC stress–strain curve, a theoretical model describing the constitutive relationship of the ECC uniaxial tensile stress–strain – the multiple cracking sawtooth model – is proposed. Several model parameters were obtained with the fitting analysis of many ECC uniaxial tensile stress–strain curves. The application conditions and influencing factors of the three-order multi-crack “sawtooth” model of polyvinyl alcohol (PVA)-ECC and polyethylene (PE)-ECC and the four-order multi-crack “sawtooth” model of PVA-ECC are studied. The result shows that the higher the fiber reinforcement index, the better the tensile properties of ECC. The fiber reinforcement index is linearly correlated with the initial crack stress and ultimate tensile stress of PVA-ECC and with the ultimate tensile stress and ultimate tensile strain of PE-ECC. The characteristic points of PVA-ECC in the multi-crack cracking stage are as follows: the greater the initial cracking strain, the smaller the ultimate tensile strain, showing an exponential correlation; The greater the initial cracking stress is, the greater the ultimate tensile stress is, and the two are linearly correlated.
描述单轴拉伸下 ECC 应变硬化和多重开裂的锯齿构造模型
通过收集工程水泥基复合材料(ECC)单轴拉伸实验研究数据,针对 ECC 应力-应变曲线中应变硬化阶段的多重开裂特征,提出了描述 ECC 单轴拉伸应力-应变构成关系的理论模型--多重开裂锯齿模型。通过对多条 ECC 单轴拉伸应力-应变曲线的拟合分析,得到了多个模型参数。研究了聚乙烯醇(PVA)-ECC 和聚乙烯(PE)-ECC 的三阶多裂纹 "锯齿 "模型以及 PVA-ECC 的四阶多裂纹 "锯齿 "模型的应用条件和影响因素。结果表明,纤维增强指数越高,ECC 的拉伸性能越好。纤维增强指数与 PVA-ECC 的初始裂纹应力和极限拉伸应力成线性关系,与 PE-ECC 的极限拉伸应力和极限拉伸应变成线性关系。PVA-ECC 在多裂纹开裂阶段的特征点如下:初始开裂应变越大,极限拉伸应变越小,呈指数相关;初始开裂应力越大,极限拉伸应力越大,两者呈线性相关。
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来源期刊
Reviews on Advanced Materials Science
Reviews on Advanced Materials Science 工程技术-材料科学:综合
CiteScore
5.10
自引率
11.10%
发文量
43
审稿时长
3.5 months
期刊介绍: Reviews on Advanced Materials Science is a fully peer-reviewed, open access, electronic journal that publishes significant, original and relevant works in the area of theoretical and experimental studies of advanced materials. The journal provides the readers with free, instant, and permanent access to all content worldwide; and the authors with extensive promotion of published articles, long-time preservation, language-correction services, no space constraints and immediate publication. Reviews on Advanced Materials Science is listed inter alia by Clarivate Analytics (formerly Thomson Reuters) - Current Contents/Physical, Chemical, and Earth Sciences (CC/PC&ES), JCR and SCIE. Our standard policy requires each paper to be reviewed by at least two Referees and the peer-review process is single-blind.
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