X-ray computed tomography observation of multiple fiber fracture in unidirectional CFRP under tensile loading

Na, Wonjin; Kwon, Dongil; Yu, Woong‐Ryeol

doi:10.1016/j.compstruct.2017.12.069

Cited by 30 publications

(10 citation statements)

References 54 publications

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“…X-ray computed tomography (XRCT) has been proven to be a powerful tool for studying this category of materials [9][10][11], because it enables an explicit and direct observation of the 3D geometry and growth path of cracks, which are important for understanding the damage behavior of CMCs. Both qualitative and quantitative investigations of damage mechanisms have been conducted using in situ XRCT for unidirectional minicomposites loaded axially [12][13][14]. However, it is still a challenge to extend this method, even when applied to simple specimen geometry, to more realistic architectured textile composites because of the large size of the volumes to be considered.…”

Section: Introductionmentioning

confidence: 99%

3D Detection and Quantitative Characterization of Cracks in a Ceramic Matrix Composite Tube Using X-Ray Computed Tomography

et al. 2020

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Cracks play an essential role in the degradation of the thermomechanical behavior of ceramic matrix composites. However, characterizing their complex 3D geometries within a complex microstructure is still a challenge. This paper presents a series of procedures, based on X-ray tomographic images, to evaluate the applied 3D strains, including their through-thickness gradients, and to detect and quantify the induced crack networks in ceramic matrix composites. Digital volume correlation and some dedicated image processing algorithms are employed. A novel method is proposed to estimate the opening, orientation and surface area of the detected cracks. The proposed procedures are applied to the images of a SiC/SiC composite tube that has been tested in situ under uniaxial tension with synchrotron X-ray computed tomography.

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Section: Introductionmentioning

confidence: 99%

3D Detection and Quantitative Characterization of Cracks in a Ceramic Matrix Composite Tube Using X-Ray Computed Tomography

et al. 2020

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“…Clustering and debonding also occurred during the process. 48,49 In region @6, all fracture modes, including matrix cracking, were active; final failure occurred within several cycles. These phenomena are evident in the unloading region shown in Figure 6(c).…”

Section: Resultsmentioning

confidence: 99%

Effect of propagation distance on acoustic emission of carbon fiber/epoxy composites

Jung

Lee

et al. 2021

Structural Health Monitoring

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This study examined the change in acoustic emission as a function of measurement position of fiber-reinforced composites. Single-edge-notched carbon fiber/epoxy composites were prepared and tested under cyclic loading, with sensors located at specific distances from the end of the notch. Although the I b-value increased overall, the degree of increase significantly varied with position and acoustic emission frequency. Notably, the proportion of acoustic emission signals for each failure mode varied due to a high attenuation rate at high frequencies, which increased the I b-value. Accordingly, the high-frequency fiber-failure signals significantly affected the I b-value. This study focused on the importance of analyzing acoustic emission signals by considering the crack location and frequency-dependent attenuation rate. We concluded that an acoustic emission sensor should be located 20–40 mm from the crack location for woven carbon fiber/epoxy composites.

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“…A scattering of X-rays can occur at interfaces between metallic layers and composite layers. The shining boundary in the image can be considered due to the partial scattering of X-rays at the interface [20]. As a result, black regions with a boundary between the metallic layer (white regions) and composite layer (grey regions) are deemed to represent a set of delamination.…”

Section: Polymer Sci Peer Rev Jmentioning

confidence: 99%

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2021

PSPRJ

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In this paper, the effect of thermal cycles on the flexural properties of 4/3 configured Glass Reinforced Aluminum (GLARE) has been evaluated with Cone Beam Computed Tomography (CBCT). GLARE is manufactured by Turkish Airlines Technic Inc. composite workshop with autoclave method. After manufacturing process, GLARE samples are subjected to thermal cycles (0, 25, 50, 100, 200 and 300 cycles) in a full function climatic chamber at temperature ranges -30 °C to +40 °C for 120min. Threepoint bending tests are applied to thermally aged GLARE samples by using Zwick Z-250 universal test machine. The variation on the flexural modulus and strength values of GLARE samples is determined. From test results, the decrements of the flexural strength and modulus of GLARE samples are occurred for 300 thermal cycles as 4.95% and 4.85%, respectively. From CBCT observations, it is determined that delamination and metallic layer fractures are the main damage mechanisms.

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X-ray computed tomography observation of multiple fiber fracture in unidirectional CFRP under tensile loading

Cited by 30 publications

References 54 publications

3D Detection and Quantitative Characterization of Cracks in a Ceramic Matrix Composite Tube Using X-Ray Computed Tomography

3D Detection and Quantitative Characterization of Cracks in a Ceramic Matrix Composite Tube Using X-Ray Computed Tomography

Effect of propagation distance on acoustic emission of carbon fiber/epoxy composites

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