Scale-linking model of self-healing and stiffness recovery in Engineered Cementitious Composites (ECC)
Scale-linking model of self-healing and stiffness recovery in Engineered Cementitious Composites (ECC)
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DOI：
10.1016/j.cemconcomp.2018.10.006
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发表时间：
2019
影响因子：
10.5
通讯作者：
Hui-ying Ma,;E. Herbert;Motohiro Ohno;V. Li
中科院分区：
文献类型：
--
作者：
Hui-ying Ma,;E. Herbert;Motohiro Ohno;V. Li
工程水泥基复合材料（ECC）中的微裂纹损伤在干湿循环中表现出自修复能力。以前的研究定性地将复合材料刚度恢复与裂纹宽度联系起来。有必要发展一个更定量的了解之间的关系的幅度的自我修复和强加的应变ECC。在这项研究中，一个分析模型，链接到ECC（细观尺度）的ECC加载到多个微裂纹损伤（宏观尺度）的刚度恢复。本研究的目的是发展这一理论的规模链接模型，并验证它与实验数据。结果发现，所提出的规模链接模型成功地预测在任何应变下的复合材料刚度恢复，基于已知的宏观尺度的裂纹图案和细观尺度的自愈合行为。它的结论是，新的模型抓住了ECC的自愈行为的本质。该模型阐明了设计具有健壮自愈行为的ECC的途径。
Micro-crack damage in Engineered Cementitious Composites (ECC) has demonstrated self-repairing capacity when exposed to wetting-drying cycles. Previous studies qualitatively relate composite stiffness recovery to crack width. There is a need to develop a more quantitative understanding of the relationship between the magnitude of self-healing and imposed strain in ECC. An analytic model that links the stiffness recovery of a single crack in ECC (meso-scale) to that of an ECC loaded to multiple micro-crack damage (macro-scale) was investigated in this study. The objective of this research is to develop this theoretical scale-linking model and validate it with experimental data. It is found that the proposed scale-linking model successfully predicted the composite stiffness recovery at any strain, based on known macro-scale crack patterns and meso-scale self-healing behavior. It is concluded that the new model captures the essence of self-healing behavior in ECC. The model clarifies the pathway for designing ECC with robust self-healing behavior.