Influence of micro-cracking on the composite resistivity of Engineered Cementitious Composites
Influence of micro-cracking on the composite resistivity of Engineered Cementitious Composites
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DOI：
10.1016/j.cemconres.2014.01.002
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发表时间：
2014-04-01
影响因子：
11.4
通讯作者：
Li, Victor C.
中科院分区：
文献类型：
--
作者：
Ranade, Ravi;Zhang, Jie;Li, Victor C.
工程水泥基复合材料（ECC）是一种结构材料，以其优异的拉伸延展性和损伤容限而闻名。先前的实验研究已经表明ECC的电阻率对施加的机械拉伸应变（压阻行为）的强烈依赖性，这可以潜在地用于结构健康监测的自感机械损伤。本文从理论和实验两方面研究了微裂纹对ECC在直接拉伸下的复合电响应的影响。为此，在宏观（复合）和细观（单裂纹）尺度上比较了两种具有不同裂纹图案的ECC的电-机械性能。在这项研究中，提出了一个分析模型连接单裂纹电响应和裂纹图案的ECC的复合电行为，并验证了两个ECC的实验观察。因此，在这项研究中开发的裂纹图案及其对ECC的压阻效应的基本认识。(C)2014爱思唯尔有限公司版权所有。
Engineered Cementitious Composites (ECCs) are structural materials known for their excellent tensile ductility and damage tolerance. Previous experimental studies have shown a strong dependence of electrical resistivity of ECC on applied mechanical tensile strain (piezoresistive behavior), which can be potentially utilized for self-sensing mechanical damage for structural health monitoring. In this paper, the influence of micro-cracks on the composite electrical response of ECC under direct tension is investigated experimentally as well as analytically. For this purpose, the electrical-mechanical properties of two ECCs with different crack patterns are compared at macro (composite) and meso (single-crack) scales. An analytical model linking single-crack electrical response and crack pattern of an ECC to its composite electrical behavior is proposed in this study, and verified for both ECCs with experimental observations. Thus, a fundamental understanding of crack patterns and their effects on piezoresistivity of ECC is developed in this study. (C) 2014 Elsevier Ltd. All rights reserved.