Investigation of Ib-Values for Determining Fracture Modes in Fiber-Reinforced Composite Materials by Acoustic Emission

Authors
Jung, DoyunYu, Woong-RyeolNa, Wonjin
Issue Date
2021-07
Publisher
MDPI Open Access Publishing
Citation
Materials, v.14, no.13
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.
Keywords
WAVELET TRANSFORM; FAILURE MODES; B-VALUE; TENSILE; DAMAGE; SIGNALS; fiber-reinforced composites; acoustic emission; fracture; Ib-values
ISSN
1996-1944
URI
https://pubs.kist.re.kr/handle/201004/116806
DOI
10.3390/ma14133641
Appears in Collections:
KIST Article > 2021
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