Stress and structural damage sensing piezospectroscopic coatings validated with digital image correlation
Stress and structural damage sensing piezospectroscopic coatings validated with digital image correlation
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通过数字图像相关性验证应力和结构损伤传感压电光谱涂层
DOI：
10.1063/1.4916760
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发表时间：
2015
期刊：
影响因子：
1.6
通讯作者：
S. Raghavan
中科院分区：
文献类型：
--
作者：
G. Freihofer;J. Dustin;H. Tat;A. Schülzgen;S. Raghavan
压电谱效应与材料的应力状态和光谱特征有关，最近当光致发光的α-氧化铝以纳米颗粒的形式分布在基质中时，它表现出了可定制的灵敏度。在此，利用数字图像相关法同时测定的双轴应变场，验证了氧化铝-环氧纳米颗粒涂层在开孔拉伸结构中的应力敏感行为。该涂层在77%的破坏载荷下实现了对复合材料破坏起始的早期检测，随后跟踪了裂纹附近的应力分布，展示了多尺度空间分辨率的非侵入性应力和损伤检测。
The piezospectroscopic effect, relating a material’s stress state and spectral signature, has recently demonstrated tailorable sensitivity when the photo-luminescent alpha alumina is distributed in nanoparticulate form within a matrix. Here, the stress-sensing behavior of an alumina-epoxy nanoparticle coating, applied to a composite substrate in an open hole tension configuration, is validated with the biaxial strain field concurrently determined through digital image correlation. The coating achieved early detection of composite failure initiation at 77% failure load, and subsequently tracked stress distribution in the immediate vicinity of the crack as it progressed, demonstrating non-invasive stress and damage detection with multi-scale spatial resolution.