Calibration of cast-in fibre Bragg gratings for internal strain measurements in cast aluminium by using neutron diffraction
Calibration of cast-in fibre Bragg gratings for internal strain measurements in cast aluminium by using neutron diffraction
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DOI：
10.1016/j.measurement.2020.107939
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发表时间：
2020-10-15
期刊：
影响因子：
5.6
通讯作者：
Volk, Wolfram
中科院分区：
文献类型：
--
作者：
Heilmeier, Florian;Koos, Robert;Volk, Wolfram
利用光纤布拉格光栅（FBG）作为内部应变传感器在铸造，凝固和冷却的两个亚共晶铝合金和工业纯铝。现场中子衍射实验同时进行现场应力-SPEC仪器在研究中子源（MLZ）在Garching。结合结构有限元模拟和X射线显微层析成像（CT）的相关实验数据，阐明了该测量系统的测量机理，为利用FBG传感器测量铝合金铸造过程中的应变提供了一种新的实用方法。FBG应变结果与由中子衍射获得的Al（311）峰相关，其进一步用于校准。通过有限元模拟和铸造试样的CT检查纤维和周围的铸造铝之间的相互作用，使得传感器能够应用于铸件中明确的应变测量以及凝固过程中合金的表征。(C)2020由Elsevier Ltd.出版
Fibre Bragg gratings (FBGs) are utilized to function as internal strain sensors during casting, solidification and cooling of two hypoeutectic Al alloys and technically pure Al. In situ neutron diffraction experiments were conducted simultaneously onsite the STRESS-SPEC instrument at the Research-Neutron Source (MLZ) in Garching. The experimental data correlated with structural finite element simulation and X-ray micro tomography (CT) elucidates the mechanisms of this measurement system.The presented work offers a new practical approach to measure in-situ strains during casting of Al alloys by using FBG-based sensors. The FBG strain results correlate with the Al(311) peak obtained by neutron diffraction which is furthermore used for calibration. The examination of interactions between fibres and surrounding cast Al by finite element simulation and CT of the cast specimens enables the application of the sensors for unequivocal strain measurements in castings as well as the characterization of alloys during solidification. (C) 2020 Published by Elsevier Ltd.