Measuring variable amplitude loading with fibre optic

• Main Authors: Assanah, N. (Author), Ciang C.C (Author), Hamid M.F.A (Author), Kuntjoro, W. (Author), Ramly, R. (Author), Romli F.I (Author)
• Format: Article
• Language: English
• Published: Institute of Physics Publishing 2018
• Subjects: Aerospace engineering; Cyclic loads; Electromagnetic fields; Fatigue failures; Fatigue loadings; Fatigue monitoring; Fatigue of materials; Fatigue testing; Fiber Bragg gratings; Fiber optics; Fibers; Spark plugs; Standard fibers; Sustainable development; Test specimens; Universal testing machines; Variable amplitude load; Variable amplitude loading
• Online Access: View Fulltext in Publisher; View in Scopus
• ISBN: 17578981 (ISSN)
• DOI: 10.1088/1757-899X/405/1/012008

Cyclic loading is known to be responsible for fatigue failure. The variable amplitude loading is a general type of fatigue load and the most common one in practice. Monitoring of fatigue loading such as variable amplitude loads is commonly conducted using strain gauges. The use of fibre optics like fibre Bragg gratings (FBG) is attractive because this type of sensor is not easily interfered by the electromagnetic fields. Its suitability for measuring accurately the cyclic loadings need to be investigated. This paper is reporting the experiments to investigate the suitability of FBG to measure variable amplitude loadings. FBG test setup using a standard fiber optic measurement system was prepared and the cyclic test was conducted using universal testing machine. The fatigue test specimens used were prepared according to the ASTM E606 standards. The obtained result shows that FBG is able to measure variable amplitude loads and this means that FBG can potentially be used for fatigue monitoring of structures. © Published under licence by IOP Publishing Ltd.