By incorporating electrically conductive yarns into a waterproof membrane, one can detect epoxy resin cracking or liquid leakage. Therefore, this study examined the electrical conductivity variations of several yarns (metallic or carbon-based) for cracking and water detection. The first observations concerned the detectors’ feasibility by investigating their conductivity variations during both their resin implementation processes and their resin cracking. Throughout this experiment, two phenomena were detected: the compression and the separation of the fibres by the resin. In addition, the resin cracking had an important role in decreasing the yarns’ conductivity. The second part of this study concerned water detection. Two principles were established and implemented, first with yarns and then with yarns incorporated into the resin. First, the principle of absorption was based on the conductivity variation with the yarns’ swelling after contact with water. A short circuit was established by the creation of a conductive path when a drop of water was deposited between two conductive, parallel yarns. Through the influence of the yarns’ properties, this study explored the metallic yarns’ capacity to better detect water with a short circuit and the ability of the carbon-based yarns to detect water by the principle of absorption.

中文翻译：

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n纺织增强复合材料渗水的原位检测

通过将导电纱线掺入防水膜中，可以检测到环氧树脂的开裂或漏液现象。因此，这项研究检查了多根纱线（金属或碳基纱线）的电导率变化，以用于开裂和水分检测。最初的观察结果是通过检测探测器在树脂实施过程中和树脂破裂过程中的电导率变化来研究其可行性。在整个实验过程中，检测到两种现象：树脂对纤维的压缩和分离。另外，树脂裂化在降低纱线的导电性方面具有重要作用。本研究的第二部分涉及水的检测。建立和实施了两个原理，首先是纱线，然后是将纱线掺入树脂中。第一，吸收原理是基于电导率随纱线与水接触后的溶胀而变化。当在两根平行的导电纱线之间沉积一滴水时，通过建立导电路径来建立短路。通过对纱线性能的影响，本研究探索了金属纱线在短路时更好地检测水的能力以及碳基纱线通过吸收原理检测水的能力。