The study presented in this paper aims to adapt and calibrate two strain measurement techniques used for textile reinforced cementitious matrix composites (TRCMCs): distributed optical fibres and 2D digital image correlation (DIC). These composites exhibit tensile behaviour characterised by a succession of transverse cracks along specimens. During the tensile test, out‐of‐plane parasitic displacements may occur due to the geometry of specimens and possible imperfections of the test method. These phenomena interfere with the measurement of the strain sensors, leading to loss of results and parasitic strain. In order to eliminate them and to finely analyse the complex behaviour of TRCMCs, a test methodology and experimental approach are proposed for optical fibres, and a practical and simple solution is proposed to quantify the parasitic strains of the 2D DIC. For optical fibres, Rayleigh backscatter is used, allowing a millimetric spatial resolution and a high recording frequency. For the DIC, required equipment is used, and the results are processed through existing commercial software.

中文翻译：

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分布式光纤与二维数字图像关联对织物增强水泥基复合材料应变测量的适应。

本文提出的研究旨在适应和校准用于纺织增强水泥基复合材料（TRCMC）的两种应变测量技术：分布式光纤和2D数字图像相关（DIC）。这些复合材料表现出拉伸性能，其特征是沿试样连续出现横向裂纹。在拉伸试验中，由于试样的几何形状和试验方法的不完善，可能会发生面外寄生位移。这些现象会干扰应变传感器的测量，从而导致结果损失和寄生应变。为了消除它们并精细分析TRCMC的复杂行为，提出了一种用于光纤的测试方法和实验方法，提出了一种实用，简单的解决方案来量化二维DIC的寄生应变。对于光纤，使用瑞利反向散射，从而实现毫米级的空间分辨率和高记录频率。对于DIC，使用必需的设备，并通过现有的商业软件处理结果。