Identification and Modelling of the In-Plane Reinforcement Orientation Variations in a CFRP Laminate Produced by Manual Lay-Up

Davila, Yves; Crouzeix, Laurent; Douchin, Bernard; Collombet, Francis; Grunevald, Yves-Henri

doi:10.1007/s10443-017-9642-4

Cited by 10 publications

(7 citation statements)

References 21 publications

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“…Davilla et al 5 implemented an image analysis technique using Hough lines to determine the ply orientation from images taken of the laminate at each stage of the layup. They presented an approach that was able to achieve the mean ply orientations to within

\pm 0.5 °

with standard deviations ranging between

0.34 °

and

0.41 °

, but this approach is not applicable for quantifying the orientation of a part after it has been manufactured as it can only be used for the outer most lamina 5 …”

Section: Introductionmentioning

confidence: 99%

“…They presented an approach that was able to achieve the mean ply orientations to within AE0:5 with standard deviations ranging between 0:34 and 0:41 , but this approach is not applicable for quantifying the orientation of a part after it has been manufactured as it can only be used for the outer most lamina. 5 Ultrasound has been used by multiple researchers for laminated composites. For example, Hsu et al 6 used a vector decomposition method whereby an image of a correctly fabricated part was aligned against an unknown part, and they were able to identify the ply misorientation and layup symmetry.…”

mentioning

confidence: 99%

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A statistical approach for failure analysis involving uncertainty in determining ply orientation

Rahul,

Jack,

Smith

2024

Polymer Composites

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This article presents the uncertainty of the part performance due to the estimated ply orientations of a carbon fiber laminate inspected using ultrasound inspection. Recent developments to quantify the orientation using ultrasound inspection is accurate to within for each lamina. The research presented in the current work statistically analyzes the impact this uncertainty in measurement has on the resulting expected failure envelope using two different analytical methods: (1) Monte‐Carlo (MC) simulation approach extending classical laminate theory and (2) Closed form approach of Mean Value First Order Second Moment method based on derivatives of failure envelope as a function of lamina orientation. The results are validated against a commercial finite element‐based MC simulation approach. The Tsai‐Wu failure criteria is implemented to determine the first ply failure stresses by applying a variety of planer loads to form the failure envelope for a given layup sequence of a carbon fiber reinforced polymer laminate. In this article, using stochastic simulations, the failure envelope is no longer deterministic but is stochastic in nature and converts the reporting from a deterministic factor of safety concept to a probability of failure for a given loading state. The analysis is visualized and quantified using the cumulative‐density‐function (CDF), which demonstrates the similarity between the stochastic results and the classical deterministic approach. To demonstrate a possible end use of the presented statistical analysis, a study of a woven composite laminate is presented where the ply orientation is estimated using ultrasound and the resulting CDF of failure is presented.Highlights Statistical analysis (Monte‐Carlo, mean value, first order, second moment) on the ply orientation variability via ultrasound inspection. Statistical analysis of classical laminate theory and FE based Tsai‐Wu failure model is developed and compared. Tsai‐Wu failure envelope is quantified and visualized using cumulative density function.

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\pm 0.5 °

with standard deviations ranging between

0.34 °

and

0.41 °

, but this approach is not applicable for quantifying the orientation of a part after it has been manufactured as it can only be used for the outer most lamina 5 …”

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

A statistical approach for failure analysis involving uncertainty in determining ply orientation

Rahul,

Jack,

Smith

2024

Polymer Composites

View full text Add to dashboard Cite

show abstract

“…Alternatively, simple camera systems and image filtering techniques have been used to determine fibre misalignment across the surface of large unidirectional prepreg plies, prior to composite layup and consolidation. 11 This work relied on the edge detection of individual fibres or bundles at high resolution in smaller subset areas to calculate the local mean fibre orientation. A similar method taking images of subset areas (75 × 75 mm 2 ) under diffuse lighting conditions has been used to evaluate the fibre distribution in glass fibre SMCs.…”

Section: Introductionmentioning

confidence: 99%

Exploiting the optical reflectance behaviour of carbon fibre composites for low-cost inspection and orientations analysis

Pierce

Liu

2020

Journal of Reinforced Plastics and Composites

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This work focusses on understanding and exploiting the optical reflectance behaviour of carbon fibre reinforced polymer composites for the non-destructive determination of fibre orientation and surface defects. By taking a series of images under different lighting conditions, fibre reflections have been isolated and MATLAB image analysis has been used to calculate the fibre orientations across the surface of the composite. An average peak method has been developed and validated against manual orientation measurements for two different applications: a machined scarf repair surface and a discontinuous fibre composite. The same experimental method and analysis code showed good results for both cases without modification, when at least 16 images with different directional lighting conditions are used. Hence, this low-cost approach can be applied to a diverse range of quality assurance and research applications where fibre orientations or other surface details need to be characterised.

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“…Alternative camera-based systems to measure fibre orientations have also been developed for various purposes with some success. [23][24][25] However, previous research by the authors has demonstrated a fibre orientation measurement technique based on optical reflectance that can be performed quickly across very large surfaces at a low cost. 26 As an extension of this approach, the current work improves its reliability and applies the technique to the evaluation of flow-induced fibre alignment in panels manufactured from high flow charges, presented in Experimental testing.…”

Section: Fibre Orientation Analysismentioning

confidence: 99%

“…Alternative camera-based systems to measure fibre orientations have also been developed for various purposes with some success. 23–25 However, previous research by the authors has demonstrated a fibre orientation measurement technique based on optical reflectance that can be performed quickly across very large surfaces at a low cost. 26…”

Section: Introductionmentioning

confidence: 99%

Fibre alignment and mechanical performance of carbon fibre Sheet Moulding Compounds under different preform compaction

Nega

Pierce

Liu

et al. 2022

Journal of Reinforced Plastics and Composites

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This work investigates the effect of preform compaction on the mechanical performance and flow-induced fibre alignment of carbon fibre reinforced Sheet Moulding Compounds (SMCs). Two groups of panels have been compression moulded from reclaimed carbon fibre tows in vinyl-ester resin with low (0.5 MPa) and high (10 MPa) preform compaction pressure Additionally, a low-cost fibre orientation analysis method has been further improved in terms of reliability, and a novel flow assessment method has been developed for carbon fibre SMCs. This approach revealed greater fibre alignment with the flow direction in the lower faces of panels as a result of greater contact time with the heated mould and a lower charge viscosity at the time of pressing. As expected, greater fibre alignment in the flow direction was observed outside the initial charge coverage area in both types of panels, where the flow was greatest. Due to additional fibre flow during the high-pressure compaction stage, the mean degree of flow alignment in the high compaction panel was 47% higher than that of the low compaction panel. Improvements in the tensile stiffness (8%) and strength (32%) were also observed as a result of the high-pressure compaction stage and associated flow alignment.

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Identification and Modelling of the In-Plane Reinforcement Orientation Variations in a CFRP Laminate Produced by Manual Lay-Up

Abstract: and modelling of the in-plane reinforcement orientation variations in a CFRP laminate produced by manual lay-up.

Cited by 10 publications

References 21 publications

A statistical approach for failure analysis involving uncertainty in determining ply orientation

A statistical approach for failure analysis involving uncertainty in determining ply orientation

Exploiting the optical reflectance behaviour of carbon fibre composites for low-cost inspection and orientations analysis

Fibre alignment and mechanical performance of carbon fibre Sheet Moulding Compounds under different preform compaction

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