SYMPOSIA PAPER Published: 01 August 2022
STP163820210038

Real-Time and Visible Monitoring of Crack Growth Behavior under Biaxial Loading Using Organic Mechanochromic Luminescence

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Strain concentration is critically important for safety assessments of structural components. In the present work, a real-time and visible monitoring method for biaxial crack growth behavior using mechanochromic luminescence (MCL) was studied. 1,1,2,2-tetrakis(4-nitrophenyl)ethene (TPE-4N) is an organic mechanoresponsive luminogen (MRL). The crack growth behavior of 2024-T4 aluminum alloy was investigated under in-plane biaxial monotonic tension–tension loading with biaxiality ratios of λ = 0, 0.5, and 1.0. The surface of specimens was coated with a uniform TPE-4N film. It is remarkable that unexpected local strain concentration can be transformed into real-time and visible fluorescence ultraviolet irradiation. The fluorescence distribution obtained using the organic MRL method has a good agreement with the results using finite element method (FEM) simulation. The local plastic deformation near the crack tip causes fragments of crystalline TPE-4N film, inducing MCF in this region. Therefore, dynamic visualization of crack initiation and the crack growth path can be achieved. The present method may open up new opportunities for large-scale, full-field, and on-site structural health monitoring of crack growth in complicated structural components.

Author Information

Lin, Hong
School of Chemical Engineering and Technology, Tianjin University, Tianjin, CN
Zhang, Zhe
School of Chemical Engineering and Technology, Tianjin University, Tianjin, CN
Chen, Gang
School of Chemical Engineering and Technology, Tianjin University, Tianjin, CN
Chen, Xu
School of Chemical Engineering and Technology, Tianjin University, Tianjin, CN
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Details
Pages: 212–223
DOI: 10.1520/STP163820210038
ISBN-EB: 978-0-8031-7724-6
ISBN-13: 978-0-8031-7723-9