Use of acoustic emission b(Ib)-values to quantify damage in composites

Jung, Doyun; Yu, Woong‐Ryeol; Na, Wonjin

doi:10.1016/j.coco.2020.100499

Cited by 25 publications

(10 citation statements)

References 43 publications

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“…The b-value analysis tracks the amplitude trend of AE signals, showing a lower value at a severe damage state. To the authors' knowledge, the application of b-value analysis in composite materials is rare, and is a first in our research group [28][29][30][31]. In previous studies in our group, we revealed a specific frequency AE signal range for each fracture mode, and the b-value analysis is feasible in composite materials.…”

Section: Introductionmentioning

confidence: 79%

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

Jung

2021

Materials

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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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Section: Introductionmentioning

confidence: 79%

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

Jung

2021

Materials

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“…In particular, the use of acoustic emission technique allows to analyse and assesses the intensity of formation and growth of defects in the structure of the material under load. Therefore, it gives an opportunity to study damage accumulation to obtain additional experimental data on the mechanical behaviour of the studied materials under load (Brunner, 2018;Lobanov and Zubova, 2019;Jung et al, 2020;Kalteremidou et al, 2021;Mohammadi et al, 2021). The energy parameter of acoustic emission signals is often used for this purpose.…”

Section: Ijsi 141 44mentioning

confidence: 99%

Evaluation of the influence of preliminary low-velocity impacts on the residual fatigue life of CFRP composites

Staroverov

Лобанов²,

Strungar³

et al. 2022

IJSI

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PurposeThe main purpose of this study was to evaluate the mechanical behaviour of layered fibrous carbon-fibre reinforced plastic (CFRP) under complex low-speed bending and impact loads and subsequent cyclic tensile loads.Design/methodology/approachA comprehensive approach was adopted to study the damage accumulation processes using state-of-the-art testing and diagnostic equipment. In the course of the study, a microstructure analysis of damages caused by a transverse impact and cyclic tension was performed.FindingsA dependence of residual fatigue life of the studied composite material on the intensity of the preliminary impact bending was established. Temperature field distribution fields on the surface of the sample during tests were shown. Data on damage accumulation processes were presented, which were obtained during the registration of acoustic emission signals.Originality/valueA connection was established between changes of registered acoustic response signals and thermal imaging camera data, which was supported by the results of an experimental study. The results of the comprehensive approach showed a qualitative correlation.

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“…In the current research, the classical Gutenberg-Richter law is widely used to calculate the AE temporal b value. [56][57][58] Many studies on reinforced concrete show that the change of b value is caused by the formation, propagation, and connection of cracks, and the sensitivity of b value to damage is also considered to be an effective tool for damage assessment. 59,60 To analyze the relationship between b value and compression damage, the temporal b value is calculated by this method.…”

Section: Temporal B-value Analysismentioning

confidence: 99%

Visual damage identification of concrete cylinders with steel‐fiber‐reinforced composite bars based on acoustic emission

Guo

Chen

Tang

et al. 2021

Structural Contr & Hlth

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Steel-fiber-reinforced composite bar (SFCB) is a composite bar composed of a crescent-rib steel bar and an outer protruded fiber-reinforced polymer (FRP) layer. Due to its unique post-yield stiffness and superior anti-corrosion behavior, the SFCB is except to be an ideal reinforcement for concrete structures subject to a high corrosion environment. For SFCB-reinforced concrete cylinders, their internal damage mechanism has never been experimentally studied but was usually speculated with the brittle failure due to the potential brittle fracture of the SFCB. To reveal the compression damage mechanism of SFCBreinforced concrete cylinders, a uniaxial compression test for SFCB-reinforced concrete cylinders was carried out at first. The entire damage process of SFCBreinforced concrete cylinders was monitored in real-time by acoustic emission (AE), a widely used nondestructive testing method. The test result shows that the SFCB-reinforced concrete cylinders fail after the buckling of longitudinal SFCB or the fracture of the stirrup. The intensity signal analysis of AE proves the failure mode of the SFCB-reinforced concrete cylinder was close to a plastic failure instead of a brittle failure. Furthermore, a new damage visualization method is proposed to analyze the internal damage of the concrete cylinders by using the spatial b value of AE. The T value was constructed by combining the spatial b value with the density distribution of AE events. It is proven that the T value is highly sensitive to the serious damages of the concrete cylinders and can be used to identify the damage locations inside the concrete cylinders.acoustic emission, concrete cylinder, damage identification, steel-fiber-reinforced composite bar, uniaxial compression | INTRODUCTIONSteel-fiber-reinforced composite bar (SFCB) is a type of composite bar developed almost a decade ago. 1 It is composed of a crescent-rib steel bar and an outer protruded fiber-reinforced polymer (FRP) layer, as shown in Figure 1. SFCB has a good bonding property with concrete 2,3 and is excepted to be an ideal reinforcement for concrete structures subject to the high earthquake risk area or the high corrosion environment due to its unique post-yield stiffness and superior anti-corrosion behavior. 1,4,5

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Use of acoustic emission b(Ib)-values to quantify damage in composites

Cited by 25 publications

References 43 publications

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

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

Evaluation of the influence of preliminary low-velocity impacts on the residual fatigue life of CFRP composites

Visual damage identification of concrete cylinders with steel‐fiber‐reinforced composite bars based on acoustic emission

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