The influence of fiber orientation and geometry-induced strain concentration on the fatigue life of short carbon fibers reinforced polyamide-6

Quagliato, Luca; Kim, Yong Hee; Fonseca, João Henrique; Han, Do-Suck; Yun, Seungjong; Lee, Hyungtak; Park, Nara; Lee, Hyungyil; Kim, Naksoo

doi:10.1016/j.matdes.2020.108569

Cited by 30 publications

(23 citation statements)

References 27 publications

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“…In previous investigations it was shown that due to the symmetrical micro-structure around the mid-plane, the results on test specimens taken from the left and right side do not differ significantly [36,37]. This is also supported by µCTmeasurements on the whole plate as well as a symmetric melt flow in the cavity [38]. Since the fiber orientation is expected to be the same for the left and right position, as shown in Figure 3a, these two positions are combined in one test series.…”

Section: Methodsmentioning

confidence: 74%

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Model Calibration and Data Set Determination Considering the Local Micro-Structure for Short Fiber Reinforced Polymers

et al. 2021

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To ensure the usability of parts made of fiber-reinforced polymers, a lifetime assessment has to be made in an early stage of the development process. To describe the whole life cycle of these parts, continuous simulation chains can be used. From production to the end of the service life, all influences are mapped virtually. The later material strength is already given after the manufacturing process due to the process dependent fiber alignment. To be able to describe this fiber orientation within the lifetime assessment, this paper presents an approach for model calibration and data set determination to consider the local micro-structure. Therefore, quasi-static and cyclic tests were performed on specimens with longitudinal and transversal fiber orientation. A supplementary failure analysis provides additional information about the local micro-structure. The local fiber orientation is determined with µCT (micro computer tomography)-measurements, correlated to the extraction positions of the specimen, and implemented in a dataset. With an attached lifetime calculation on a demonstrator, a major influence of the local micro-structure on the calculation results can be shown. Therefore, it is indispensable to consider the local fiber orientation in the data set determination of short fiber reinforced polymers.

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Section: Methodsmentioning

confidence: 74%

“…In many studies, the material calibration is done using specimens extracted in the middle of the plate (center position) under various angles (0 • , 45 • and 90 • ), as shown in [38]. Although this approach is valid, higher fiber orientations, which appear near the edges of the plate will not be covered.…”

Section: Discussionmentioning

confidence: 99%

Model Calibration and Data Set Determination Considering the Local Micro-Structure for Short Fiber Reinforced Polymers

et al. 2021

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“…Unidirectional SCF and epoxy reinforced polyamide is fabricated using different matrix systems and same SCF 9) . Mechanical and static fatigue properties of 20% by weight by SCF reinforced polyamide6 are investigated on both unnotched and notched specimens 10) . The manufacture of composite in various combinations with tailored strength properties, high fatigue, toughness, oxidation resistance capabilities, high temperature, and wear provides an excellent choice in engineering applications 11) .…”

Section: Introductionmentioning

confidence: 99%

Characterization and Analysis of Mechanical Properties of Short Carbon Fiber Reinforced Polyamide66 Composites

Choudhari¹,

Kakhandki²

2021

Evergreen

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In recent years, Short Carbon Fiber (SCF) reinforced Polyamide66 (PA66) composites materials have increased their demand in automotive and aircraft industries due to their superior mechanical properties. Firstly, different specimens were prepared of 00, 10, 20, 30, 40, 50, 60% weight of SCF content in PA66. As per ASTM standards, tensile, flexural, compression, and density specimens were manufactured on an injection molding machine. Then, tensile, flexural, compression specimens are tested on UTM and density specimen tests carried out directly on mass and volume relation. Secondly, on advanced micrographs Field Emission Scanning Electron Microscopy (FESEM), tensile, flexural, and compression specimens were tested. In the tensile test, it was found that most SCFs were pulled out and some agglomerated from the matrix instead of breaking. The flexural test showed that the debonding of SCF from the grid is because of the matrix uncovered close to the fiber surface. Cleavage was observed due to a plastic twist of the matrix after SCF peeling. In the compression test, extreme adhesion and a compatible bond between SCF and matrix are observed. It is pushed together with higher compressive force, only small grooves and cavities are observed and not much damage. Further, observed that all specimens have a strong interface, adhesive bond, no differences in matrix holes sizes, even fibers distribution, and no segregation.

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“…It is not necessarily the case in all components. Quagliato et al [23] very recently investigated the notch effect on fatigue lifetime in short carbon fiber reinforced Polyamide 6. Interestingly, the proposed approach integrated the local fiber length and orientation (predicted by the MoldFlow® software) into the computation of the mechanical properties at any point of the sample or part.…”

Section: Introductionmentioning

confidence: 99%

Fatigue life assessment in notched injection-molded specimens of a short-glass fiber reinforced Polyamide 6 with different injection gate locations

Castagnet

Nadot-Martin

Fouchier

et al. 2021

International Journal of Fatigue

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Based on a previously published Through Process Modeling (TPM) for multiaxial fatigue life assessment of injection-molded components, this work aimed to capture the difference of fiber orientation distribution ahead of notch tips in flat notched samples of PA6GF30 tested in tension at ambient temperature. The fiber orientation originated from different locations of the injection gate for an unchanged macroscopic geometry. Good lifetime estimations were obtained in Side-(resp. Top-) injected samples, regardless the choice of the sample type from which the fatigue criterion was identified. The experimentally observed differences of crack initiation zones were correlated to numerical simulations.

show abstract

The influence of fiber orientation and geometry-induced strain concentration on the fatigue life of short carbon fibers reinforced polyamide-6

Cited by 30 publications

References 27 publications

Model Calibration and Data Set Determination Considering the Local Micro-Structure for Short Fiber Reinforced Polymers

Model Calibration and Data Set Determination Considering the Local Micro-Structure for Short Fiber Reinforced Polymers

Characterization and Analysis of Mechanical Properties of Short Carbon Fiber Reinforced Polyamide66 Composites

Fatigue life assessment in notched injection-molded specimens of a short-glass fiber reinforced Polyamide 6 with different injection gate locations

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