Manufacturing processes for composite materials and components for aerospace applications

McIlhagger, Alistair; Archer, Edward; McIlhagger, R.

doi:10.1016/b978-0-85709-523-7.00003-7

Cited by 40 publications

(20 citation statements)

References 23 publications

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“…If not explicitly stated otherwise, the summarized results have been obtained from the characterization of carbon fiber/epoxy prepreg systems which represent the standard in AFP and ATL manufacturing of large aerospace structures. [ 107 ]…”

Section: Experimental Studiesmentioning

confidence: 99%

Prepreg tack: A review of mechanisms, measurement, and manufacturing implication

2020

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The stickiness of prepregs (tack) is considered a decisive material property for the success of high‐quality composite manufacturing by automated lay‐up processes such as automated fiber placement (AFP) or automated tape laying (ATL). Adverse control of prepreg tack can easily result in laminate defects or machine breakdown, which are highly undesirable considering the tremendous machinery and material costs of these processes. Prepreg tack is governed by a complex interaction of adhesive and cohesive phenomena that are influenced by machine and environmental parameters of the production process as well as by intrinsic properties of the prepreg material itself. This review aims at providing a condensed insight into the current state of research on prepreg tack. Therefore, experimental studies including the discussion of utilized tack measurement methods as well as model approaches to prepreg tack are reviewed. The findings are discussed against the background of fundamental mechanisms, the strong interdependency of influencing parameters and the challenge of translating measured tack data into an enhanced AFP/ATL process stability by process adjustment.

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Section: Experimental Studiesmentioning

confidence: 99%

Prepreg tack: A review of mechanisms, measurement, and manufacturing implication

2020

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“…In this technique, polyester resin is poured over the reinforcement [2]. In addition, usually a tool is used to properly distribute polyester resin (in polyester resin initiator and accelerator are mixed).…”

Section: Wet Layup Methodsmentioning

confidence: 99%

“…Pultrusion is a method for production of tubular sections, rods and cylindrical type profiles in a continuous manner [2,4]. The fundamental difference between pultrusion and filament winding is the winding pattern.…”

Section: Filament Winding and Pultrusionmentioning

confidence: 99%

Polyester Usage in Manufacturing of Electrical and Mechanical Products and Assemblies

Nawaz¹,

Islam²,

Khattak³

et al. 2018

Polyester - Production, Characterization and Innovative Applications

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This chapter focuses on the processes in which polyester is usually used for the manufacturing of mechanical components and assemblies. Various methods of manufacturing these products are mentioned in this chapter. These methods include wet layup method, filament winding, pultrusion, vacuum bagging and autoclave curing, resin transfer molding (RTM) and vacuum-assisted resin transfer molding (VARTM). Various production levels and properties can be achieved by polyester resin using abovementioned processes. Each process has its own benefits and disadvantages, which are discussed in this chapter. Furthermore, the use of polyester in making electrical insulation is also discussed in the chapter. Advantages and disadvantages of each impregnation technique are also explained.

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“…This is predominantly so in aircraft structures as the weight reductions result in reduced running costs and greater payloads. 3 A constraint in large-scale composite use relates to the inspection for component integrity. 4 Besides, the main problem is high attenuation of the ultrasonic signal due to scattering and multiple reflections inside the material caused by different acoustic impedance of the layers or plies or resin/adhesives placed between the layers.…”

Section: Introductionmentioning

confidence: 99%

Defect characterisation in laminar composite structures using ultrasonic techniques and artificial neural networks

Barry

Kesharaju

Nagarajah

et al. 2015

Journal of Composite Materials

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This paper presents an approach to defect detection and characterisation in ultrasonic inspection of laminate composite panels. A set of features coupled with gates was identified along with a method for sub-dividing and thresholding the ultrasonic data, which removes most of the location specific information from the defect data thus increasing the generalisation capabilities of the defect classifier. Validation results obtained from independent defect data indicate that the performance of the presented data description tools coupled with an artificial neural network classifier was able to correctly locate and classify defects at different depths. It was concluded that a structured approach to the pre-processing of ultrasonic testing data, combined with the selective feature extraction for artificial neural network classification, greatly reduces the requirement for artificial neural network training data. Furthermore, it allows for improved performance across a variety of panel geometries.

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Manufacturing processes for composite materials and components for aerospace applications

Cited by 40 publications

References 23 publications

Prepreg tack: A review of mechanisms, measurement, and manufacturing implication

Prepreg tack: A review of mechanisms, measurement, and manufacturing implication

Polyester Usage in Manufacturing of Electrical and Mechanical Products and Assemblies

Defect characterisation in laminar composite structures using ultrasonic techniques and artificial neural networks

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