Monitoring Epoxy Coated Steel under Combined Mechanical Loads and Corrosion Using Fiber Bragg Grating Sensors

Abstract

Fiber Bragg grating (FBG) sensors have been applied to assess strains, stresses, loads, corrosion, and temperature for structural health monitoring (SHM) of steel infrastructure, such as buildings, bridges, and pipelines. Since a single FBG sensor measures a particular parameter at a local spot, it is challenging to detect different types of anomalies and interactions of anomalies. This paper presents an approach to assess interactive anomalies caused by mechanical loading and corrosion on epoxy coated steel substrates using FBG sensors in real time. Experiments were performed by comparing the monitored center wavelength changes in the conditions with loading only, corrosion only, and simultaneous loading and corrosion. The theoretical and experimental results indicated that there were significant interactive influences between loading and corrosion for steel substrates. Loading accelerated the progress of corrosion for the epoxy coated steel substrate, especially when delamination in the epoxy coating was noticed. Through the real-time monitoring from the FBG sensors, the interactions between the anomalies induced by the loading and corrosion can be quantitatively evaluated through the corrosion depth and the loading contact length. These fundamental understandings of the interactions of different anomalies on steel structures can provide valuable information to engineers for better management of steel structures.

Experimental study on the durability of an in-line sensor epoxy membrane under pipeline cleaning events

“…Through the ages, pipeline integrity monitoring and investigation has been gaining arising attention in industry [1], since the pipeline network is expanding and carrying majority of energy product [2]. Although multiple techniques are posted to monitor the in-line environment [3] [4], the physical sensor [5] passively monitor the changing signal is still the mainstream of industrial application. The traveling portion of a typical PIG is made up of a rigid and hollow center body and two sets of sealing disks.…”

Experimental investigation of corrosion monitoring on duplex-coated steel utilizing distributed fiber optic sensors

“…Structural integrity is frequently jeopardized by mechano-chemical effects, stemming from the interplay of mechanical loads and chemical assailants, notably corrosion [1], [2]. Among these threats, corrosion poses a significant hazard to steelbased civil structures, including plates, reinforcing bars, and prestressed tendons, hastening their deterioration and diminishing their longevity [3], [4].…”

Investigating combined effects between dynamic mechanical loads and corrosion on epoxy coated steel using distributed fiber optic sensors

“…Corrosion-induced structural deterioration is a significant concern in civil infrastructure, as it poses a serious threat to the durability, reliability, and safety of engineering structures [1]. Reinforced concrete and steel are commonly used construction materials that are vulnerable to corrosion, especially when exposed to environmental factors such as moisture, oxygen, and pollutants.…”

“…sensors have been widely used for corrosion monitoring [8]. FBG sensors can be used to detect localized corrosion by monitoring the strain changes caused by the formation of corrosion pits.…”