Controlling the Crack Propagation Path of the Veil Interleaved Composite by Fusion-Bonded Dots

Chen, Guangchang; Zhang, Jindong; Liu, Gang; Chen, Puhui; Guo, Miaocai

doi:10.3390/polym11081260

Cited by 8 publications

(4 citation statements)

References 22 publications

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“…The most relevant aspects observed in the analysis of the fracture surfaces of the specimens tested to fatigue under mixed mode I/II loading using the MMB and ADCB test methods are presented below, with the aim of identifying the dominant fracture processes. A JEOL 6610LV scanning electron microscope (SEM) was used for this purpose [35,36]. Starting with the specimens tested by means of the MMB method, Figure 9 shows the region close to the insert used to initiate delamination in a fatigue specimen for a mode mixity ratio of 0.2.…”

Section: Analysis Of Fracture Surfacesmentioning

confidence: 99%

Influence of the Test Method on the Characterization of the Fatigue Delamination Behavior of a Composite Material under Mixed Mode I/II Fracture

et al. 2019

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Composite materials manufactured by overlapping plies with certain specific geometries are likely to lose part of their strength due to the presence of internally delaminated regions. The aim of this paper is to experimentally evaluate the generation and propagation of these interlaminar cracks in a carbon-epoxy composite material subjected to fatigue loading under mixed mode I/II fracture. Two different test methods were used for this purpose: The standardized mixed-mode bending (MMB) test and the asymmetric double cantilever beam (ADCB) test, with the goal of exploring the viability of the ADCB test as a simpler alternative to perform than the MMB test, especially in fatigue testing. With this aim in mind and after prior static characterization of the material in which the critical values of the energy release rate were determined under both test methods, the levels of the energy release rate to be applied in fatigue tests were defined for two mode mixity ratios, GII/Gc = 0.2 and 0.4 (0.34 ADCB), and a fatigue loading ratio, R = Gmin/Gmax = 0.1. The G-N fatigue onset curves were subsequently obtained from these experimental data. The most relevant result of the study is that the fatigue limits obtained using the MMB method are generally more conservative than those obtained via the ADCB method.

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Section: Analysis Of Fracture Surfacesmentioning

confidence: 99%

Influence of the Test Method on the Characterization of the Fatigue Delamination Behavior of a Composite Material under Mixed Mode I/II Fracture

et al. 2019

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“…Many researches focused on the further enhancement of the mechanical properties of PPTA fibers, including the tensile strength and modulus [5][6][7][8]. Introducing the nanofiller on the surface or internal of the fibers is the one of most commonly strategies, which is expected to reinforce the aramid fiber by combining the two strong materials.…”

Section: Introductionmentioning

confidence: 99%

Effect of High Molecular Weight PPTA on Liquid Crystalline Phase and Spinning Process of Aramid Fibers

Chen

Liu

et al. 2020

Polymers

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High molecular weight poly (p-phenylene-terephthalamide) (h-PPTA) was blended with the commercial PPTA in concentrated sulfuric acid to improve the spinnability of the polymer solutions and the mechanical properties of the as-spun fibers. h-PPTA in the solution has an influence on the temperature of the formation of liquid crystalline phenomenon. The temperature range with the existence of the liquid crystalline phase increases upon the contents of h-PPTA in the solution, and the extended temperature window is helpful for the preparation of PPTA fibers by the dry-jet wet-spinning technology. The long-chains of h-PPTA enhance the inter-macromolecular interactions and induce the orientation of short-chains for PPTA along the fiber axis under the shear stress in the spinneret and the stretching stress at the air gap. These effects also increase the maximum drawing ratio in the spinning process and improve the mechanical properties of the obtained fibers. The crystallinity and crystal orientation of the fibers are investigated by X-ray diffraction, and results from sonic velocity test further confirm ordering state of the macromolecular chains. The fibril morphologies of the fibers are also studied by a scanning electric microscope.

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“…Beckermann et al [ 11 ], Meireman et al [ 12 ], Garcia-Rodriguez et al [ 13 ], Quan et al [ 14 ], Kuwata et al [ 26 , 27 ], Del Saz-Orozco et al [ 31 ], Saghafi et al [ 35 , 36 ], Nash et al [ 37 , 38 ], Guo et al [ 39 ], Chen et al [ 40 ], Ognibene et al [ 41 ], Pozegic et al [ 42 ], Beylergil et al [ 43 , 44 , 45 ], Alessi et al [ 46 ], Barjasteh et al [ 47 ], Monteserin et al [ 48 , 49 ], Daelemans et al [ 50 , 51 , 52 ], De Schoenmaker et al [ 53 ], O’Donovan et al [ 54 ], and Hamer et al [ 55 ] reported that PA veils as interleaves for FRP composite laminates are applicable in either carbon or glass fiber reinforcement. PAs of different classes were used in these studies, such as PA 6 (sometimes, the brand name Nylon is used), PA 11, PA 12, PA 66, and PA 69.…”

Section: Comparative Analysis Of the Toughening Effectmentioning

confidence: 99%

A Review of Electrospun Nanofiber Interleaves for Interlaminar Toughening of Composite Laminates

et al. 2023

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Recently, polymeric nanofiber veils have gained lot of interest for various industrial and research applications. Embedding polymeric veils has proven to be one of the most effective ways to prevent delamination caused by the poor out-of-plane properties of composite laminates. The polymeric veils are introduced between plies of a composite laminate, and their targeted effects on delamination initiation and propagation have been widely studied. This paper presents an overview of the application of nanofiber polymeric veils as toughening interleaves in fiber-reinforced composite laminates. It presents a systematic comparative analysis and summary of attainable fracture toughness improvements based on electrospun veil materials. Both Mode I and Mode II tests are covered. Various popular veil materials and their modifications are considered. The toughening mechanisms introduced by polymeric veils are identified, listed, and analyzed. The numerical modeling of failure in Mode I and Mode II delamination is also discussed. This analytical review can be used as guidance for veil material selection, for estimation of the achievable toughening effect, for understanding the toughening mechanism introduced by veils, and for the numerical modeling of delamination.

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Controlling the Crack Propagation Path of the Veil Interleaved Composite by Fusion-Bonded Dots

Cited by 8 publications

References 22 publications

Influence of the Test Method on the Characterization of the Fatigue Delamination Behavior of a Composite Material under Mixed Mode I/II Fracture

Influence of the Test Method on the Characterization of the Fatigue Delamination Behavior of a Composite Material under Mixed Mode I/II Fracture

Effect of High Molecular Weight PPTA on Liquid Crystalline Phase and Spinning Process of Aramid Fibers

A Review of Electrospun Nanofiber Interleaves for Interlaminar Toughening of Composite Laminates

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