Determination of the strength and elongation distribution of single wool through fiber bundle testing based on acoustic emissions

Lu, Di; Yu, Weidong; Pan, Ning

doi:10.1177/0040517520975093

Cited by 4 publications

(4 citation statements)

References 23 publications

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“…The Weibull shape parameter, m, of the reference wool fibers takes the values from 3.6 to 5.6 (Table 2) that correlate well with data for various natural fibers reported elsewhere [21,23,25,33]. Weak correlations between the parameter m and the gauge length of fibers were established within each group of samples, although the literature data often reveal that m decreases as the fiber length increases, i.e., longer gauge length results in greater strength scatter [23,25,30]. An increasing trend is noticed for m determined by fitting the average strength data by Equation (5).…”

Section: Weibull Strength Distribution Analysissupporting

confidence: 77%

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Environmental Effects on Strength and Failure Strain Distributions of Sheep Wool Fibers

et al. 2022

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Sheep wool is an eco-friendly, renewable, and totally recyclable material increasingly used in textiles, filters, insulation, and building materials. Recently, wool fibers have become good alternatives for reinforcement of polymer composites and filaments for 3D printing. Wool fibers are susceptible to environmental degradation that could shorten their lifetime and limit applications. This study reports on the mechanical properties of sheep wool fibers under the impact of humid air and UV irradiation. The results of single fiber tensile tests showed a noticeable gauge length effect on the fibers’ strength and failure strain. Long (50 mm) fibers possessed about 40% lower characteristics than short (10 mm) fibers. Environmental aging decreased the elastic modulus and strength of the fibers. Moisture-saturated fibers possessed up to 43% lower characteristics, while UV aging resulted in up to a twofold reduction of the strength. The most severe degradation effect is observed under the coupled influence of UVs and moisture. The two-parameter Weibull distribution was applied for the fiber strength and failure strain statistical assessment. The model well predicted the gauge length effects. Moisture-saturated and UV-aged fibers were characterized by less extensive strength dependences on the fiber length. The strength and failure strain distributions of aged fibers were horizontally shifted to lower values. The results will contribute to be reliable predictions of the environmental durability of sheep wool fibers and will extend their use in technical applications.

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Section: Weibull Strength Distribution Analysissupporting

confidence: 77%

“…Most of the works reported in the literature focused on the characterization of specific sheep wool fibers and determining their strength, and rarely on failure strain and distribution [22,30,31]. A few works highlighted environmental impacts on the mechanical characteristics of sheep wool [9,13] and some plant fibers [26].…”

Section: Introductionmentioning

confidence: 99%

Environmental Effects on Strength and Failure Strain Distributions of Sheep Wool Fibers

et al. 2022

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“…21 At the same time, the distribution of the strength and elongation of the single fiber need to be based on a large number of single fiber tensile tests, which is very tedious and time-consuming. 22,23 It is a very important task to solve the nonlinear problem of the fiber load-elongation curve and the probability distribution of single fiber strength and elongation in FBM.…”

Section: Introductionmentioning

confidence: 99%

Study on the tensile mechanical property of wool bundle fibers through fracture sounds detected by acoustic emission

Lu,

2023

Journal of Industrial Textiles

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This study deals with the prediction of the mechanical properties of wool bundle fibers and the characterization of the fracture performance of fiber fracture sound. Acoustic emission detection was used to record the fracture sound of wool fibers. According to the fracture sounds, the tensile properties of the bundle fibers were obtained. Acoustic emission provided a convenient method for obtaining fibers breaking elongation distribution. Based on the fiber bundle model and fiber breaking distribution, the fracture strength and elongation of bundle fibers could be predicted. Meanwhile, based on the correlation between the amplitude of fiber fracture sound and fiber breaking strength, the single fiber breaking strength could be predicted and the tensile properties of bundle fibers could also be obtained. The prediction results based on bundle fiber fracture sound were more similar to the measured results. Besides, the number of fibers within the bundle increased, the fiber interaction was also enhanced, and the bundle fiber strength prediction results were affected. This work was considered to have the potential of being used in the prediction of mechanical properties of natural fiber composites.

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“…2 More than one descriptor can be used as criteria in each research to measure failure and classify failure modes because more criteria help prohibit overlapping data and clarify classification. 3,4 There are different clustering methods, including K-means, 5,6 C-means, 7 and sentry function. 8 One of the methods is wavelet transform, which uses two criteria of frequency and energy and classifies data by the entropy method.…”

Section: Introductionmentioning

confidence: 99%

Behavior of woven fabric composite under tensile loads in different directions using acoustic emission

Dehnad

Dolatabadi

Najafabadi

et al. 2022

Journal of Industrial Textiles

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The woven fabric composites were used in different industries for their special specification. This study aimed to address failure mechanisms in single-layer woven fabrics. The acoustic emission (AE) technique and wavelet transform were used for composite structural health monitoring and failure rate evaluation. From a mechanical study viewpoint, the load-displacement behavior of plain-woven glass composite was examined under tension in the principal directions (0 and 90°) and off-axis (30, 45, and 60°). The results indicated that off-axis samples are deformed and curled due to the slippage and rotation of warp and weft yarns. The mechanical measurements were synchronized with the AE data in an acousto-mechanical study. The load-displacement behavior of samples was zoned out with two criteria: frequency and energy. Eventually, three failure modes were identified: matrix damage, interface damage, and fiber breakage. The results showed that events with a frequency above 400 kHz at different angles could be attributed to fiber breakage. Also, the applied force angle effectively affects the type of fiber failure (tensile and shear failure). It was found that in addition to tensile failure, shear failure also increases sharply by increasing the angle between the main directions. So that the maximum number of shear fiber failures occurred at the angle of 45° between the main directions. On the off-axis, the number of fibers exposed to the load also increased, increasing the number of breakages.

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Determination of the strength and elongation distribution of single wool through fiber bundle testing based on acoustic emissions

Cited by 4 publications

References 23 publications

Environmental Effects on Strength and Failure Strain Distributions of Sheep Wool Fibers

Environmental Effects on Strength and Failure Strain Distributions of Sheep Wool Fibers

Study on the tensile mechanical property of wool bundle fibers through fracture sounds detected by acoustic emission

Behavior of woven fabric composite under tensile loads in different directions using acoustic emission

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