Measurement of small angle fiber misalignments in continuous fiber composites

Yurgartis, S.W.

doi:10.1016/0266-3538(87)90016-9

Cited by 296 publications

(149 citation statements)

References 16 publications

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“…These models are based on the assumption that initial misalignment is uniformly distributed in a band of infinite length. The fibre misalignment, however, is roughly Gaussian distributed as shown by Yurgartis [4], when describing a tool for measuring fibre misalignment. Another method for measuring fibre misalignment has been proposed by Creighton et al [5] using an automated image analysis procedure to determine 2D fibre misalignment.…”

Section: Introductionmentioning

confidence: 99%

A novel image analysis procedure for measuring fibre misalignment in unidirectional fibre composites

Kratmann

Sutcliffe

Lilleheden

et al. 2009

Composites Science and Technology

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Section: Introductionmentioning

confidence: 99%

A novel image analysis procedure for measuring fibre misalignment in unidirectional fibre composites

Kratmann

Sutcliffe

Lilleheden

et al. 2009

Composites Science and Technology

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“…Different fiber manufacturing steps can induce inherent misalignment, such as machine vibration during filament winding, or electrostatic repulsion of fibers during coating (Swift, 1975). Such manufacturing flaws were reported to cause a fiber misalignment angle ranging between ±108, although most fibers were found to lie within ±38 of the mean fiber direction (Yurgartis, 1987).…”

Section: Fiber Misalignment Formation In Lcmmentioning

confidence: 99%

Process Induced Defects in Liquid Molding Processes of Composites

Hamidi

Altan

2017

International Polymer Processing

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Liquid Composite Molding (LCM) processes are cost efficient manufacturing alternatives to traditional autoclave technology for producing near-net shape structural composite parts. However, process induced defects often limit wider usage of LCM in structural applications. Thorough knowledge of these defects, as well as their formation mechanisms and prevention techniques, is essential in developing improved LCM processes. In this article, process induced defects in liquid molding processes of composites, categorized into preform, flow induced and cure induced defects, are reviewed. Preform defects are further presented as fiber misalignment and fiber undulation (waviness and wrinkling). The respective causes, detrimental effects, and possible prevention methods of these defects are presented. Thereafter, flow induced defects are classified as voids and dry spots. Dry spot formation mechanisms in LCM processes and available prevention techniques are summarized. In addition, void formation mechanisms, adverse effects on composite properties, and removal techniques are presented. Cure induced defects include microcracks, void growth and geometrical distortions (warpage and spring-in). Each of these defects are discussed along with their underlying causes as well as their control and reduction schemes.

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“…Yurgartis [39] and Jelf and Fleck [16] have shown that local fiber misalignment angles in composites can be reasonably approximated by a normal distribution. Fig.…”

Section: Probability-weighted Averagingmentioning

confidence: 99%

The effect of general statistical fiber misalignment on predicted damage initiation in composites

Bednarcyk

Aboudi

Arnold

2014

Composites Part B: Engineering

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a b s t r a c tA micromechanical method is employed for the prediction of unidirectional composites in which the fiber orientation can possess various statistical misalignment distributions. The method relies on the probability-weighted averaging of the appropriate concentration tensors, which are established by the micromechanical procedure. This approach provides access to the local field quantities throughout the constituents, from which initiation of damage in the composite can be predicted. In contrast, a typical macromechanical procedure can determine the effective composite elastic properties in the presence of statistical fiber misalignment, but cannot provide the local fields. Fully random fiber distribution is presented as a special case using the proposed micromechanical method. Results are given that illustrate the effects of various amounts of fiber misalignment in terms of the standard deviations of in-plane and out-of-plane misalignment angles, where normal distributions have been employed. Damage initiation envelopes, local fields, effective moduli, and strengths are predicted for polymer and ceramic matrix composites with given normal distributions of misalignment angles, as well as fully random fiber orientation.Published by Elsevier Ltd.

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Measurement of small angle fiber misalignments in continuous fiber composites

Cited by 296 publications

References 16 publications

A novel image analysis procedure for measuring fibre misalignment in unidirectional fibre composites

A novel image analysis procedure for measuring fibre misalignment in unidirectional fibre composites

Process Induced Defects in Liquid Molding Processes of Composites

The effect of general statistical fiber misalignment on predicted damage initiation in composites

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