Progressive Damage Analysis of Carbon Fabric-reinforced Polymer Composites under Three-point Bending

Han, Kang-ning; Zhou, Wei; Qin, Reng; Yang, Sa; Ma, Lianhua

doi:10.1007/s12221-021-0357-7

Cited by 12 publications

(9 citation statements)

References 25 publications

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“…This phenomenon proved the debonding between fiber and matrix resulted in delamination of specimens during three‐point bending test once again. Small amount of matrix cracking and fiber breakage were also could be observed at the middle part of images, this was mainly due to the high shear stress around the loading head 44 . Compared with Specimen A, the deformation of triangular support structure inside Specimen B was much slighter, because the increased Kevlar fiber layers endured more flexural load.…”

Section: Resultsmentioning

confidence: 91%

“…AE signals can well reflect the generation and evolution of damages of 3D‐printed continuous Kevlar fiber‐reinforced composites in real time, while micro‐CT is useful to observe micro damage structures of specimens. Therefore, it is necessary and meaningful to connect AE analyses with micro‐CT observations for the sake of complete characterization of failure behavior of 3D print composites 44 . During the first loading stage of progressive test (loads varied from 0 to the maximum value point M), it can be seen from micro‐CT images that damages including delamination of Sample A were significantly more serious than that of Specimen B, which was consistent with that the accumulative count, energy and amplitude of AE signals were higher for Specimen A 43 .…”

Section: Resultsmentioning

confidence: 99%

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Features of acoustic emission and micro‐CT of 3D‐printed continuous Kevlar fiber‐reinforced composites during progressive damage under flexural load

Liu

Wang

Song

et al. 2022

J of Applied Polymer Sci

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Failure mechanism and its characterization methods of 3D‐printed fiber‐reinforced composites are still needed thorough investigation. In this work, typical 3D‐printed composites reinforced with 10% and 20% continuous Kevlar fiber are prepared, respectively, three point bending progressive damage experiments are carried out, and the damage evolution are real‐time monitored by acoustic emission (AE) technology. When load reaches the maximum value and failure point, microcomputed tomography (micro‐CT) observations are performed for loaded specimens to explore inside damages. Results show that bending strength of Specimen B (20% fiber) increases by 23% relative to Specimen A (10% fiber). Cumulative count and energy of AE signals are higher for Specimen B, and K‐means clustering algorithm is employed for deep analysis of AE signals. Three damage modes including matrix crack, fiber/matrix debonding, and fiber fracture are clustered and validated by micro‐CT, indicating that the combination of AE and micro‐CT is effective for the characterization of damage evolution of composites. Debonding due to poor adhesion between fiber and matrix is the main damage mode of 3D‐printed Kevlar fiber‐reinforced composites, and damages of Specimen B concentrated in the later stage. This work provides failure characterization methods for 3D‐printed fiber‐reinforced composites.

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Section: Resultsmentioning

confidence: 91%

Section: Resultsmentioning

confidence: 99%

Features of acoustic emission and micro‐CT of 3D‐printed continuous Kevlar fiber‐reinforced composites during progressive damage under flexural load

Liu

Wang

Song

et al. 2022

J of Applied Polymer Sci

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“…It should be noted that with the increase of load, there is no sudden drop for all specimens with a ply angle of 45°, owing to the matrix plasticity and alignment of tows along the loading directions which called fiber trellising. 20 The 3D printed continuous fiber reinforced composites with 20% glass fibers have higher failure load indicating that the glass fibers play an important role in the improvement of the overall mechanical properties. As one of the significant parameters of 3D printed continuous fiber reinforced composite, the glass fiber fraction has an obvious effect on the mechanical properties of the composites.…”

Section: Resultsmentioning

confidence: 96%

Experimental investigation on the mechanical behavior and damage of 3D printed composites under three-point bending

Zhang

Pan

et al. 2022

Journal of Composite Materials

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Three-dimensional (3D) printing has been triumphantly applied for the manufacture of various composite components. In this work, acoustic emission (AE), X-ray micro-computed tomography (Micro-CT) are used in conjunction with digital image correlation (DIC) measurement to investigate the mechanical behaviors of 3D printed continuous fiber reinforced composites under three-point bending test. Meanwhile, several mechanical experiments are carried out to study the flexural properties of three kinds of composite specimens, among which the specimens with larger glass fiber content exhibit more superior mechanical properties. Furthermore, AE response characterizations and microscopic damage morphology are also examined. In consequence, the complementary nondestructive testing (NDT) technology combining AE, DIC, and Micro CT is successfully applied to evaluate the mechanical behaviors of 3D printed composites, and the flexural deformation and damage are comparatively investigated for different composite specimens. The cross-validation results of cluster analysis (k-means), K-Nearest Neighbor (KNN) and principal component analysis (PCA) show that AE parameters including frequency, amplitude, and RA value (rise time divided by peak amplitude) are closely associated with the damage process of different specimens. The results show that the PCA can confirm the selected K-means cluster analysis parameters (peak frequency and peak amplitude) and the dimensionality reduction effects of 20% glass fiber specimens have the best results, indicating that the proportion of the principal components extracted can represent the original parameters is 81%. It was also confirmed that the supervised learning KNN algorithm corresponding to different damage patterns can verify the unsupervised learning k-means cluster. Correspondingly, the strain fields characterized by DIC are reasonably matched with the AE signal responses. In addition, the critical damage and delamination mechanisms of the 3D printed continuous fiber reinforced composites are clearly revealed by Micro-CT characterization.

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“…Carbon-fiber-reinforced polymers (CFRPs) are a group of materials finding very vast application in many industries. [1,2] They offer flexibility in obtaining mechanical and physical properties of structures to fit particular loading conditions. By combining various types of reinforcement and matrix, one can achieve very different materials for structural and functional applications.…”

Section: Introductionmentioning

confidence: 99%

“…[1,10,[25][26][27][28][29][30][31][32][33] A lot of papers report the growth of carbon nanotubes directly on the surface of carbon fiber fabrics [34,35] but this approach is not industrially scalable. According to the literature review, it can be concluded that using carbon nanotubes (CNTs) as supplementary filler for CFRPs can upgrade them to hybrid composites with great electrical and thermal conductivity along with high mechanical properties such as static strength at tension, [10,26] flexure, [2,25,33,36] and shear. [37] Fracture toughness [17,38,39] and impact toughness [35,40] are positively affected by the addition of carbon nanotubes.…”

Section: Introductionmentioning

confidence: 99%

Mechanical properties of carbon‐fiber‐reinforced epoxy composites modified by carbon micro‐ and nanofillers

Бурков

Еремин

2021

Polymer Composites

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Hybrid composite materials reinforced with unidirectional fibers and small-scale micro-or nanoparticles provide benefits compared to traditional composites. The present paper shows the experimental investigation of carbonfiber-reinforced polymers modified by the addition of 0.5-5 wt% of milled carbon fibers and 0.1-0.5 wt% of single-wall carbon nanotubes. Both fillers were analyzed from technological point of view. The impact on mechanical and physical properties was revealed and discussed. Main attention was paid to quasi-static tensile and flexural properties as well as fatigue behavior under tension-tension mode. The maximal improvement in static tensile strength by 8.6% (from 682 to 741 MPa) and flexural strength by 14% (from 649 to 740 MPa) was achieved by the addition of 0.3 wt% single-wall carbon nanotubes. Short beam shear strength increased by 18%. Fatigue durability was highly improved as well. The strengthening mechanisms are attributed to the improvement of shear interfacial properties. In contrast to single-wall carbon nanotubes, milled carbon fibers enhanced the properties by 3%-9% only at static loading, while fatigue properties are negatively affected.

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Progressive Damage Analysis of Carbon Fabric-reinforced Polymer Composites under Three-point Bending

Cited by 12 publications

References 25 publications

Features of acoustic emission and micro‐CT of 3D‐printed continuous Kevlar fiber‐reinforced composites during progressive damage under flexural load

Features of acoustic emission and micro‐CT of 3D‐printed continuous Kevlar fiber‐reinforced composites during progressive damage under flexural load

Experimental investigation on the mechanical behavior and damage of 3D printed composites under three-point bending

Mechanical properties of carbon‐fiber‐reinforced epoxy composites modified by carbon micro‐ and nanofillers

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