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使用多重FBG传感器阵列进行应变测量:一个实验性调查

Bruno da Silva Falcão^1,2,3, Ausama Giwelli^2,4, Melissa Nogueira Kiewiet²

¹School of Engineering, Edith Cowan University, Joondalup WA 6027, Australia.

|August 10, 2023

概括

纤维布拉格格 (FBG) 传感器可以准确地测量岩石力学中的辐射应变,即使是在异质样本中. 这种先进的传感技术有可能在测试期间进行详细的3D菌株映射.

科学领域:

地质技术工程地质技术工程
材料科学材料科学材料科学
传感器技术传感器技术

背景情况:

在岩石力学中,传统的辐射应变测量通常依赖于中高度的表面附着,这可能会误导异质材料中的变形.
纤维布拉格格网 (FBG) 传感器提供了小尺寸,复杂化和磁性免疫等优势,使其适用于先进的应变测量应用.

研究的目的:

调查FBG传感器在岩石力学测试中精确测量辐射应变的能力,包括在限制压力下测试.
为了比较FBG传感器的性能与传统的张力计和辐射支柱.

主要方法:

应用FBG传感器 (125微米外直径,Ormocer涂层) 在整个高度的石灰石和烯酸 (PMMA) 插头 (38毫米直径) 上.
样品经过了无限制压力 (UCS) 测试和水静电测试 (高达20 MPa的限制压力).
在UCS测试期间,使用传统的张力计和悬臂型辐射计进行比较分析.

主要成果:

射线应变和计算的弹性性能的FBG传感器读数与传统测量器件可比.
在液压测试期间从FBG数据中得出的明显散装模块与本地测量和文献值保持一致.
计算的弹性特性的变化表明FBG传感器检测到内部样本异质性,与X射线CT密度配置文件相关联.

结论:

FBG传感器在岩石力学测试中提供可靠的辐射应变测量,优于异质材料的传统方法.
FBG传感器配置显示了详细的3D应变映射的巨大潜力,揭示了岩石样本内的内部结构变化.

关键词:

这是一个FBG传感器.液态测试试验液态测试试验不受限制的压力强度 (UCS)

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