Contribution of processing parameters on void content in the vacuum bagging configurations of L-shaped composite laminates

Hassan, Muhammad Hafiz; Othman, Abdul Rahim

doi:10.1007/s00170-017-0585-6

Cited by 16 publications

(8 citation statements)

References 17 publications

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“…Advanced composites in the form of fiber‐reinforced composites (FRC) are widely used in applications for lightweight structures, replacing metallic materials, due to their commendable mechanical properties, design flexibility, and corrosion‐free structures. [ 1–5 ] Autoclave processing which utilizes above‐ambient pressures (typically ranges from 5 to 10 atm) during a high‐temperature curing process, is a robust technique to produce FRC. However, the high‐acquisition, operation, and maintenance costs associated with autoclave shells, time‐consuming curing processes, and limited composite size motivate the need for more economical and flexible alternative manufacturing techniques.…”

Section: Introductionmentioning

confidence: 99%

Effects of processing parameters for vacuum‐bag‐only method on void content and mechanical properties of laminated composites

et al. 2020

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Process parameters for vacuum‐bag‐only (VBO) method are of critical importance to control manufacturing‐induced void content and mechanical properties of laminated composites. Currently, no comparative studies are readily available on various VBO processing parameters namely bagging techniques, cure cycles, and laminate thicknesses on induced defects and mechanical properties. Hence, this study investigates the effects of these parameters on manufacturing‐induced void content and mechanical properties of composite laminates. Laminate samples were manufactured using L27 Taguchi orthogonal array experimental plan. Void contents, tensile and flexural properties of these samples were evaluated. Double VBO technique and direct (modified) cure cycle were found to be the most promising parameters in achieving the lowest void content among choices of bagging techniques and cure cycles, respectively. However, improved mechanical properties were achieved using a single VBO technique due to the higher fiber reinforcement volume fraction. In comparison to a typical cure cycle, the modified cure cycles were able to reduce surface porosity and through‐thickness void by 48.33% and 23.7%, respectively, whereas the tensile and flexural properties were increased by 2% to 3% and 17% to 20%, respectively. In addition, no significant interaction between parameters was observed.

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Section: Introductionmentioning

confidence: 99%

Effects of processing parameters for vacuum‐bag‐only method on void content and mechanical properties of laminated composites

et al. 2020

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“…Excellent in mechanical properties, carbon-fibre-reinforced plastic (CFRP) is the primary option for the automotive and aviation industries to replace the existing uneconomic materials for mechanical structures [1]. Generally, CFRP is manufactured via autoclave or vacuum bagging and is offered ready to shape to cope with structural specifications [2]. The hole-making process is compulsory to assemble CFRP mechanical parts.…”

Section: Introductionmentioning

confidence: 99%

Effect of Drilling Penetration Angle on Delamination for One-Shot Drilling of Carbon Fiber Reinforced Plastic (CFRP)

Salleh

Rahman

Jaafar

et al. 2022

MJCSM

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Carbon-fibre-reinforced plastic is prominent with superb specific mechanical properties that contribute to its application in high technology industries, such as aircraft and automobiles' mechanical structures. These materials are considered hard to cut. The delamination issues frequently arise due to their anisotropy and inhomogeneity. In aircraft manufacturing, thousands of holes are required to assemble the structural parts. Hole perpendicularity issues undoubtedly might happen during manual drilling. The main purpose of this work is to study the effects of various minor slant drilling angles on thrust force generation and delamination by using a special drill reamer. From the investigation, the drilling penetration angle significantly impacted the delamination. The delamination factor for the entry and exit sides of holes relatively decreased from 1.042 and 1.087 to 1.027 and 1.049, respectively, as the thrust force declined from 114.8 N to 106.5 N from 5° to 0° drilling angle.

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“…One factor, definitely critical for laminate thickness variation in general is bagging for the cure. One approach to eliminate or reduce corner thinning has been to use an intensifier or caul plate and thereby try to distribute the cure pressure more evenly [16][17][18][19]. However, these can give other problems.…”

Section: Introductionmentioning

confidence: 99%

Vacuum-Assisted Hot-Forming Using Tailored Laminate Temperature

2021

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A non-isothermal vacuum assisted hot-forming process using tailored laminate temperature is introduced. By using process simulation and manufacturing experiments, improved laminate quality is achieved compared to the standard hot-forming process. Furthermore, it is also shown that the manufacturing time in the clean room can be reduced to one tenth of the standard process time. In this study 8.4 mm thick quasi-isotropic laminates from unidirectional prepreg were laid up flat with an automatic tape laying machine and hot-formed to a U-shaped laminate. The laminates were then cured in a concave mould with standard bag on the inside. A complete tailored temperature hot-forming cycle of 7.5 min produced a very good final laminate quality with a total thickness variation as low as 4.0% and without wrinkles or indications of porosity. With a 4 min hot-forming cycle the thickness variation was also acceptable at 8%.

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Contribution of processing parameters on void content in the vacuum bagging configurations of L-shaped composite laminates

Cited by 16 publications

References 17 publications

Effects of processing parameters for vacuum‐bag‐only method on void content and mechanical properties of laminated composites

Effects of processing parameters for vacuum‐bag‐only method on void content and mechanical properties of laminated composites

Effect of Drilling Penetration Angle on Delamination for One-Shot Drilling of Carbon Fiber Reinforced Plastic (CFRP)

Vacuum-Assisted Hot-Forming Using Tailored Laminate Temperature

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