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

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

doi:10.3390/ma14133641

Cited by 6 publications

(4 citation statements)

References 30 publications

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“…In FRP, the b-value, a parameter used to assess material integrity, changes in response to the type of cracks present; it increases when microcracks are dominant and decreases when macrocracks become dominant. The Ib-value (an indicator of crack progression) is observed to consistently decrease from the initiation of a crack to the final failure of the material [34][35][36]. This behavior in FRP is similar to what has been observed in other materials, such as rocks and concrete.…”

Section: Introductionsupporting

confidence: 80%

Enhancing Reliability and Safety in Industrial Applications: Assessing the Applicability of Energy b-Value to Composites

Jung,

Lee

2024

Materials

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This study investigates the fracture behavior of glass fiber-reinforced plastic (GFRP) under various loading conditions using acoustic emission (AE) testing. Using fracture tests and time series analysis of AE signals, parameters such as b-value, improved b-value (Ib-value), and energy b-value (be-value) were examined to understand crack initiation, growth, and structural failure. The stress–strain curve revealed distinct responses during tensile and step loading, and time series analysis highlighted variations in amplitude, AE energy, and Kaiser and Felicity effects. Under tensile loading, the Ib-value exhibited a linear decrease, while step loading introduced complexities, including the Felicity effect. The be-value, incorporating energy considerations, fluctuated, providing insights into micro-cracks and macro-cracks. Statistical analysis demonstrated a consistent decrease in the be-value, emphasizing its potential for long-term monitoring. This study provides a comprehensive technique for assessing composite material fracture behavior, enhancing understanding for critical applications in hydrogen storage vessels and pressure pipes as well as advancing reliability and safety in industrial sectors.

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Section: Introductionsupporting

confidence: 80%

Enhancing Reliability and Safety in Industrial Applications: Assessing the Applicability of Energy b-Value to Composites

Jung,

Lee

2024

Materials

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“…Due to the lack of a unified standard for the evaluation index of self-healing concrete, the most commonly used method is to compare the performance indices of concrete before and after damage. Some references used acoustic emission as the method to monitor and inspect mechanical behavior of cementitious structures [ 26 , 27 , 28 , 29 , 30 , 31 ]. In this paper, the recovery rate of the compressive strength and the recovery rate of the sound speed of the concrete were used.…”

Section: Test Methods and Evaluation Indicesmentioning

confidence: 99%

Influencing Factors on the Healing Performance of Microcapsule Self-Healing Concrete

et al. 2021

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The amounts of the components in a microcapsule self-healing system significantly impact the basic performance and self-healing performance of concrete. In this paper, an orthogonal experimental design is used to investigate the healing performance of microcapsule self-healing concrete under different pre-damage loads. The strength recovery performance and sound speed recovery performance under extensive damage are analyzed. The optimum factor combination of the microcapsule self-healing concrete is obtained. Scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) are carried out on the concrete samples before and after healing to determine the healing mechanism. The results show that the healing effect of self-healing concrete decreases with an increase in the pre-damage load, and the sound speed recovery rate increases with an increase in the damage degree. The influence of the sodium silicate content on the compressive strength and compressive strength recovery rate of the self-healing concrete increases, followed by a decrease. The optimum combination of factors of the microcapsule self-healing system is 3% microcapsules, 30% sodium silicate, and 15% sodium fluosilicate. The results can be used for the design and preparation of self-healing concrete.

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“…Fiber-reinforced composites exhibit anisotropic and non-homogeneous properties, which complicates the analysis of acquired AE signals due to the complex propagation of waveforms in the presence of damage [ 25 , 26 ]. Hence, the study of damage mechanisms and damage extension processes in fiber-reinforced composites poses greater challenges compared to isotropic materials [ 27 , 28 , 29 ]. The selection of an appropriate signal processing method is of utmost importance in the detection, analysis, and study of acoustic emission (AE) signals, as it significantly contributes to enhancing the accuracy of detection.…”

Section: Introductionmentioning

confidence: 99%

Study of the Effect of NaOH Treatment on the Properties of GF/VER Composites Using AE Technique

Ming,

He,

et al. 2024

Materials

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The purpose of this study is to use acoustic emission (AE) technology to explore the changes in the interface and mechanical properties of GF/VER composite materials after being treated with NaOH and to analyze the optimal modification conditions and damage propagation process. The results showed that the GF surface became rougher, and the number of reactive groups increased after treating the GF with a NaOH solution. This treatment enhanced the interfacial adhesion between the GF and VER, which increased the interfacial shear strength by 25.31% for monofilament draw specimens and 27.48% for fiber bundle draw specimens compared to those before the GF was modified. When the modification conditions were a NaOH solution concentration of 2 mol/L and a treatment time of 48 h, the flexural strength of the GF/VER composites reached a peak value of 346.72 MPa, which was enhanced by 20.96% compared with before the GF was modified. The process of damage fracture can be classified into six types: matrix cracking, interface debonding, fiber pullout, fiber relaxation, matrix delamination, and fiber breakage, and the frequency ranges of these failure mechanisms are 0~100 kHz, 100~250 kHz, 250~380 kHz, 380~450 kHz, 450~600 kHz, and 600 kHz and above, respectively. This paper elucidates the fracture process of GF/VER composites in three-point bending. It establishes the relationship between the AE signal and the interfacial and force properties of GF/VER composites, realizing the classification of the damage process and characterizing the mechanism. The frequency ranges of damage types and failure mechanisms found in this study offer important guidance for the design and improvement of composite materials. These results are of great significance for enhancing the interfacial properties of composites, assessing the damage and fracture behaviors, and implementing health monitoring.

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

Cited by 6 publications

References 30 publications

Enhancing Reliability and Safety in Industrial Applications: Assessing the Applicability of Energy b-Value to Composites

Enhancing Reliability and Safety in Industrial Applications: Assessing the Applicability of Energy b-Value to Composites

Influencing Factors on the Healing Performance of Microcapsule Self-Healing Concrete

Study of the Effect of NaOH Treatment on the Properties of GF/VER Composites Using AE Technique

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