Complementary ex situ investigations of various fracture modes in a single-edge-notched symmetric cross-ply laminate subjected to tensile loading

Hong, Chaeyoung; Ji, Wooseok

doi:10.1016/j.coco.2019.11.004

Cited by 13 publications

(4 citation statements)

References 6 publications

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“…The in situ CT scan images are compared to the previous CT scan images from interrupted tests in Figure 5 [10]. Different from the conclusions in Hong et al [7] which compared in situ synchrotron X-ray against ex situ CT scan with dye penetrant, the quality of the current in situ CT scans was found to be as good as the conventional CT scans of the previous interrupted specimens with dye penetrant.…”

Section: Discussionmentioning

confidence: 58%

“…The focus was to improve the image quality but not to characterize material properties. Hong et al [7] compared the results provided by ex situ CT and in situ synchrotron X-ray radiography scans for fracture mode characterization in a single-edge-notched specimen under tensile loading. They reported that delamination failures interacting with longitudinal and transverse cracks were not detected by in situ X-ray scans due to the limited field-of-view but were detected by ex situ CT scan.…”

Section: Introductionmentioning

confidence: 99%

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In situ characterization of trans-laminar fracture toughness using X-ray Computed Tomography

Sun

Takeda

Wisnom

et al. 2020

Composites Communications

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The change in the critical strain energy release rate as damage evolves, known as the Rcurve, is of crucial importance to the understanding of fracture behaviour. The examination of damage evolution ahead of the crack tip in order to determine accurately the crack increment is key for the determination of the R-curve. Conventional in situ methods such as optical measurements only examine the specimen surfaces. X-ray Computed Tomography (CT) offers satisfactory image quality, but conventional CT scanning requires the removal of the specimens from the test machine. If no dye penetrant is used, the specimens can be re-loaded, but some important information will be missing such as the early load drops corresponding to damage initiation. If dye penetrant is used, the specimens can no longer be re-tested. In contrast, in situ CT scanning can capture the detailed damage states ply-by-ply while the specimen is loaded and diminish the need for multiple specimens. In situ characterization of trans-laminar fracture toughness of composites using CT has not been attempted in the past. It has been proven successful in this research, and shown that a partial R-curve can be constructed with a single Extended Single-Edge-notch Tension (ESET) specimen.

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Section: Discussionmentioning

confidence: 58%

Section: Introductionmentioning

confidence: 99%

In situ characterization of trans-laminar fracture toughness using X-ray Computed Tomography

Sun

Takeda

Wisnom

et al. 2020

Composites Communications

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“…already fail to properly characterize those properties of various conventional polymer composites, as often reported in the literature. [371] The reason is due to the nonlinear fracture process zone (i.e., damage zone) in front of the propagating crack, often reported in carbon-/glass-fiber-reinforced polymers [372][373][374] and other quasi-brittle materials (e.g., concrete, cement, rock, sandstone, nano-composites, tough ceramics, wood, shale, bone, sea ice, nanoand micro-scale materials, etc.). [375,376] As illustrated in Figure 17B, this zone is typically non-negligible compared to the specimen size tested in the literature.…”

Section: Fracture Of Thermoplastic Ppcs (Pfrps) and Invalidity Of Ast...mentioning

confidence: 99%

A review of the fabrication methods and mechanical behavior of continuous thermoplastic polymer fiber–thermoplastic polymer matrix composites

et al. 2022

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Thermoplastic polymer fiber-thermoplastic polymer matrix composites (PPCs or PRFPs), often recognized as self-reinforced or single polymer composites, are potential candidates for future advanced polymer composites because of various advantages (e.g., recyclability, formability, low-cost, ultra-lightweight, environmental friendliness, etc.). The manufacturability and mechanical behavior of these composites compared to conventional carbon-/glass-/aramid-fiberreinforced polymers is of great interest to the composites community, but there are a limited number of studies in this area. To this end, this paper reviewed fabrication methods with different processing parameters and mechanical behavior of uni-/multi-directional thermoplastic PPCs featuring continuous thermoplastic Lisa D. Fring and Madhusudhan R. Pallak contributed equally to this study.

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“…The voltage and current of the X-ray beam source are set to 40 keV and 400 μA, respectively. Damaged specimens are first dipped in dye penetrant [29] before they are scanned. X-ray CT results are displayed in Fig.…”

Section: Load-time History Curvesmentioning

confidence: 99%

CSAI analysis of non-crimp fabric cross-ply laminate manufactured through wet compression molding process

Hong

Choi

Kim

et al. 2021

Composite Structures

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The main purpose of the present work is to demonstrate mechanical performance of a wet-compressionmolding (WCM) composite product through conventional compressive-strength-after-impact (CSAI) analysis. Biaxial non-crimp fabric (NCF) is utilized to manufacture laminated composite panels. Specimens are cut from the panels and tested to characterize fundamental mechanical properties of the NCF composite. The volume fractions of fibers and voids are also measured to evaluate the quality of the WCM product. Impact tests are carried out to examine impact resistance of the composite structure. Numerous impact characteristics at various energy levels are quantitatively measured. Internal failure patterns and damage extent are revealed via Xray CT. Compression tests on the impacted plates are followed to evaluate structural integrity and damage tolerance (SIDT). 3D DIC technique is employed and distinct buckling responses dependent on impact energy levels are successfully visualized. Experimental results are showing a promising potential of the WCM process as one of the alternatives to the conventional autoclave-based fabrication method.

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Complementary ex situ investigations of various fracture modes in a single-edge-notched symmetric cross-ply laminate subjected to tensile loading

Cited by 13 publications

References 6 publications

In situ characterization of trans-laminar fracture toughness using X-ray Computed Tomography

In situ characterization of trans-laminar fracture toughness using X-ray Computed Tomography

A review of the fabrication methods and mechanical behavior of continuous thermoplastic polymer fiber–thermoplastic polymer matrix composites

CSAI analysis of non-crimp fabric cross-ply laminate manufactured through wet compression molding process

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