Evaluation of GIC in glass fiber/epoxy using acoustic emission
Abstract
The use of fiber-reinforced polymers (FRPs) has increased in recent years due to their high specific mechanical properties. However, the “Achilles heel” of these materials is their tendency to delaminate, which can lead to catastrophic failure of structural components such as wind turbine blades. For this reason, the evaluation of delamination failure in FRPs continues to be a topic of interest in the scientific and engineering community. With this motivation, this paper presents an innovative way to evaluate delamination through the Acoustic Emission (AE) technique, by detecting and monitoring the initiation and propagation of mode I delamination in a FRP based on glass fiber reinforced epoxy resin. For this, double cantilever beam (DCB) specimens were prepared, and acoustic emission sensors (AES) were placed in two different positions on the DCB specimens: AES10 located 10 mm before the crack tip and AES75 located 75mm after crack initiation. The results of the characterization of mode I delamination by AE were in agreement with the results obtained by the standard methods; being the AES10 the one that showed a greater precision in the measurement.
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