声发射
材料科学
复合材料
断裂(地质)
复合数
纤维
环氧树脂
极限抗拉强度
开裂
作者
Doyun Jung,Woong‐Ryeol Yu,Wonjin Na
出处
期刊:Materials
[MDPI AG]
日期:2021-06-29
卷期号:14 (13): 3641-3641
被引量:4
摘要
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.
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