Fiber optic sensors for continuous strain measurement in concrete
Fiber optic sensors for continuous strain measurement in concrete
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DOI：
10.1002/best.201800105
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发表时间：
2019-03-01
影响因子：
1.1
通讯作者：
Petryna, Yuri
中科院分区：
文献类型：
--
作者：
Speck, Kerstin;Vogdt, Fritz;Petryna, Yuri
在各种多轴应力条件下确定载荷引起的各向异性损伤需要在小尺寸样本内进行应变测量。因此，使用了没有工厂设置保护涂层的准连续测量光纤传感器。本文解释了测量原理，并展示了哪些测量配置适合现有的测量系统，以获得精确的值，特别是在小应变范围内。为此目的，传感器纤维和涂层材料发生变化，并研究了哪些支撑结构可用于将测量传感器定位在样本中。目的是获得至少与已建立的应变计和摄影测量测量系统具有相同精度的测量结果。为此，对砂浆棱柱的单轴压缩和拉伸测试进行了评估，并开发了适合未来多轴测试的测量概念。
The determination of load-induced, anisotropic damages under various multi-axial stress conditions requires a strain measurement inside small sized specimens. Therefore, quasi-continuous measuring fibre optic sensors without factory-set protective coating were used. This article explains the measuring principle and shows which measuring configurations are suitable for the existing measuring system in order to obtain exact values, especially in the range of small strains. Sensor fibres and coating material were varied for this purpose and it was investigated which supporting structures could be used to position the measuring sensors in the specimen. The aim was to obtain measurements with at least the same accuracy as the established strain gauge and photogrammetry measurement systems. For this purpose, uniaxial compression and tensile tests on mortar prisms are evaluated and a suitable measuring concept for future multiaxial tests is developed.