Abstract
In this study, an acoustic emission (AE) technique was used as a passive non-destructive tool to detect the damage progress in short glass fiber-reinforced composite panels. AE detection was conducted during three-point bend tests, thus illustrating the flexural damage accumulation for composite panels with different sizes and fiber volume content. To demonstrate the universality of the employed integrity assessment methodology, AE data was detected using different timing parameters and two different transducer types, i.e., medium-band and wide-band frequency sensors. The AE waveform classification presented in this study is based on peak frequency distributions. Frequency bands that are associated with certain failure mechanisms, including matrix micro-cracking, fiber debonding, delamination, and fiber breakage, were obtained from the technical literature. Through this investigation, the concept of cumulative signal strength (CSS) and cumulative rise time versus peak amplitude ratio (CRA) as AE output parameters are shown to facilitate integrity assessment for the employed complex composite material system. Significant jumps in CSS and CRA curves could be correlated to critical strain levels and distinct damage events in the composite panels subjected to flexural loading.
Highlights
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Corrosion damage in traditional steel and concrete pipes and tanks necessitates costly repairs and maintenance efforts, which buoys the demand for fiber-reinforced polymer composite (FRPC) products that are highly resistant to corrosion, while not sacrificing pressure loading capacity
Mechanical testing and acoustic emission (AE) monitoring was performed on two sets of short glass fiber-reinforced polyester composite panel coupons, one set with a fiber volume fraction of
Summary
Advancements in the design and manufacturing of composite materials have rendered reinforced polymer composite (RPC) materials a competitive candidate for a variety of engineering, industrial and technological applications, in sectors, such as aerospace, military, civil engineering and construction, oil and gas exploration, and chemical processing. High specific mechanical stiffness and strength, high resistance against corrosion, low weight, and improved fatigue performance are a few attractive characteristics of RPCs. the composition of a fiber-reinforced polymer composite (FRPC) can be tailored to optimize component weight and rigidity. Corrosion damage in traditional steel and concrete pipes and tanks necessitates costly repairs and maintenance efforts, which buoys the demand for FRPC products that are highly resistant to corrosion, while not sacrificing pressure loading capacity. Installation and repair are other attractive properties of FRP pipes and vessels compared to their traditional competitors
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