Abstract This study reports a new damage quantification method for fiber-reinforced composites using the acoustic emission (AE) b(Ib)-value. Plain-woven carbon fiber/epoxy composite specimens were prepared and their AE signals were analyzed under cyclic loadings (10 cycles per step, up to 700 MPa of tensile stress). The analysis showed that fiber breakage and interfacial failure occurred in the low stress region, which caused complex macrocracks to form. During the test, b-values (given by the relationship between the number and amplitude of AE hits) decreased continuously, providing information on the overall extent of the damage. However, this was not obvious in the large stress region (under 700 MPa) due to significant AE hits with low amplitude from matrix cracking and complex fracture behavior, raising b-value. In contrast, a modified parameter (Ib-value) showed a continuously decreasing trend in all regions, indicating its suitability as a health monitoring parameter.

中文翻译：

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使用声发射 b(Ib) 值来量化复合材料中的损伤

摘要 本研究报告了一种使用声发射 (AE) b(Ib) 值对纤维增强复合材料进行损伤量化的新方法。制备了平织碳纤维/环氧树脂复合材料试样，并在循环载荷（每步 10 次循环，高达 700 MPa 的拉伸应力）下分析了它们的 AE 信号。分析表明，低应力区发生纤维断裂和界面破坏，形成复杂的宏观裂纹。在测试过程中，b 值（由 AE 命中次数和幅度之间的关系给出）不断下降，提供有关损坏整体程度的信息。然而，这在大应力区域（低于 700 MPa）中并不明显，因为基体开裂和复杂的断裂行为导致显着的 AE 冲击和低振幅，提高了 b 值。相比之下，