Abstract
This study analyzed failure behavior using Ib-values obtained from acoustic emission (AE) signals. Carbon fiber/epoxy specimens were fabricated and tested under tensile loads, during which AE signals were collected. The dominant peak frequency exhibited a specific range according to fracture mode, depending on the fiber structures. Cross-ply specimens, with all fracture modes, were used and analyzed using b- and Ib-values. The b-values decreased over the specimens’ entire lifetime. In contrast, the Ib-values decreased to 60% of the lifetime, and then increased because of the different fracture behaviors of matrix cracking and fiber fracture, demonstrating the usefulness of Ib-values over b-values. Finally, it was confirmed that abnormal conditions could be analyzed more quickly using failure modes classified by Ib-values, rather than using full AE data.
Highlights
Fiber-Reinforced CompositeFiber-reinforced plastics (FRPs) are widely used in various fields of engineering—such as aerospace, ships, and machinery—because of their high specific strengths [1,2,3]
To the authors’ knowledge, the application of b-value analysis in comin our group, we revealed a specific frequency Acoustic emission (AE) signal range for each fracture mode, and posite materials is rare, and is a first in our research group [28,29,30,31]
We found group, we revealed a specific frequency AE signal range for each fracture mode, and the bthat the b-value can be in affected by the propagation environmental value analysis is feasible composite materials
Summary
Fiber-reinforced plastics (FRPs) are widely used in various fields of engineering—such as aerospace, ships, and machinery—because of their high specific strengths [1,2,3]. To the authors’ knowledge, the application of b-value analysis in comin our group, we revealed a specific frequency AE signal range for each fracture mode, and posite materials is rare, and is a first in our research group [28,29,30,31]. We found group, we revealed a specific frequency AE signal range for each fracture mode, and the bthat the b-value can be in affected by the propagation environmental value analysis is feasible composite materials. This analysis can provide helpful information about fracIn this study, damage state promoting and failure mechanism ture behavior and thethe analysis approach, our research.
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