期刊
MATERIALS
卷 15, 期 18, 页码 -出版社
MDPI
DOI: 10.3390/ma15186310
关键词
machine learning; deep learning; computer vision; CFRP laminates; strengthening RC; strain monitoring
类别
资金
- European Regional Development Fund (ERDF) [LISBOA-01-0247-FEDER-033948]
This paper proposes and benchmarks a contact-free architecture for measuring the strain level of CFRP laminates based on computer vision. The architecture, using machine learning and deep learning methods, provides an economic feasible, automated, easy-to-use, and accurate solution. It can be widely used in the application of pre-stressed CFRP laminates.
The strengthening of concrete structures with laminates of Carbon-Fiber-Reinforced Polymers (CFRP) is a widely adopted technique. retained The application is more effective if pre-stressed CFRP laminates are adopted. The measurement of the strain level during the pre-stress application usually involves laborious and time-consuming applications of instrumentation. Thus, the development of expedited approaches to accurately measure the pre-stressed application in the laminates represents an important contribution to the field. This paper proposes and benchmarks contact-free architecture for measuring the strain level of CFRP laminate based on computer vision. The main objective is to provide a solution that might be economically feasible, automated, easy to use, and accurate. The architecture is fed by digitally deformed synthetic images, generated based on a low-resolution camera. The adopted methods range from traditional machine learning to deep learning. Furthermore, dropout and cross-validation methods for quantifying traditional machine learning algorithms and neural networks are used to efficiently provide uncertainty estimates. ResNet34 deep learning architecture provided the most accurate results, reaching a root mean square error (RMSE) of 0.057 parts per thousand for strain prediction. Finally, it is important to highlight that the architecture presented is contact-free, automatic, cost-effective, and measures directly on the laminate surfaces, which allows them to be widely used in the application of pre-stressed laminates.
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