Out-of-autoclave scarf repair of interlayer toughened carbon fibre composites using double vacuum debulking of patch

Chong, H.M.; Liu, S.L.; Subramanian, Alamelu Suriya; Ng, Shu Pei; Tay, Siok-Wei; Wang, S.Q.; Feih, S.

doi:10.1016/j.compositesa.2018.01.001

Cited by 23 publications

(13 citation statements)

References 34 publications

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“…These voids are mostly observed in the resin-rich regions of the material. The presence of large voids is expected to be detrimental to the mechanical properties due to their deleterious effects on the crack propagation in the resin-rich, inter-tow regions [44,45,46,47]. Voids are also one of the concerns for long-term durability of composites as they accelerate moisture uptake [48].…”

Section: Resultsmentioning

confidence: 99%

Fabrication of High Quality, Large Wet Lay-Up/Vacuum Bag Laminates by Sliding a Magnetic Tool

et al. 2018

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This study presents a novel method to fabricate high-quality, large composite parts which can be used in a wet lay-up/vacuum bag (WLVB) process. The new method utilizes a commercial lifting magnet, which is commonly used for transporting ferrous plates, to apply a magnetic consolidation pressure on the WLVB composite lay-up. The pressure is applied on a large area of the laminate by slowly sliding the magnet over the vacuum bag surface, which leads to an improved laminate quality. When further improvement is desirable, multiple passes of the magnet can be performed, where each pass successively compacts the lay-up. To explore the feasibility of implementing this technique, random mat and plain weave glass/epoxy laminates were fabricated, and their properties compared to conventional WLVB laminates. The effects of the number of moving passes of the lifting magnet on the laminate microstructure and properties are also investigated. As a result of multiple passes, the fiber volume fraction in random mat and plain weave laminates increases to 34% and 53%, representing 80% and 16% improvements, respectively. In addition, the void volume fraction reduces almost by 60% to a very low level of 0.7% and 1.1%, respectively. Consequently, the flexural properties considerably enhance by 20–81%, which demonstrates the potential of the proposed method to produce WLVB parts with substantially higher quality. It is also shown that there exists an optimal number of passes, depending on the fabric type where additional passes induce new voids as a result of excessive resin removal.

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Section: Resultsmentioning

confidence: 99%

Fabrication of High Quality, Large Wet Lay-Up/Vacuum Bag Laminates by Sliding a Magnetic Tool

et al. 2018

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“…Many researchers conducted short term tests subjected to environmental condition by changing a number of variables such as the adhesive material, composite patch material, patch geometry, curing temperature etc. in order to determine the performance of repair bonded joints and optimize the joints [4,[34][35][36][37][38][39][40][41]. The main challenge is how to give an assurance of these repair joints for long term operation throughout their service life.…”

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confidence: 99%

Bonded repair of composite structures in aerospace application: a review on environmental issues

2018

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IntroductionOutstanding properties of fiber reinforced polymer composite materials, lead to a wide application in all the sectors such as aerospace, automotive, marine, sports industries and even in the civil infrastructures, etc. Since the last decades, an enormous use of composite materials in the aerospace sector has caused an increasing need for repair technology of damaged component rather than replacement with a new component [1][2][3][4]. Composite structures in service experience damage that comes from the accidental impact and mechanical or environmental condition [5,6]. The main environmental threats are related to the effect of temperature and moisture absorption, which can affect the strength of composite structures and reduce their service life [4,7,8]. The temperature and moisture levels could vary throughout the day (see Fig. 1), from take off to the landing or vice versa, during seasonal change or geographical difference [9]. This cyclic temperature and moisture could even further deteriorate the structures and then lead to premature failure of the structure. AbstractOver the last two decades, the repair of existing engineering structures using fiber reinforced polymer composites has attracted a great attention by aerospace industry, as it is more economical than replacing new. With an increased use of composite material in aerospace field, it is thus essential to restore the structural integrity by repair of damaged part. Concerns regarding the long term durability of composite repair bonded joints have been a major obstacle for critical component of aerospace structures. This paper reviews the current research on the environmental durability of adhesive bonded repair of composite structures to focus on the durability concerns and suggestion on the research needed in this area. The most important environmental factors (moisture and temperature) are reviewed thoroughly and also combined environmental effect. Finite element methods used to predict the environmental influence on the composite bonded joints are briefly reviewed. Finally, the paper concludes with key findings, opportunities and future research topics in order to develop cost effective, better quality and reliable composite repair bonded joints.

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“…Pişme döngüsü tamir alanının yanına yerleştirilen ısı sensörleri (thermocouple) ile kontrol edilmektedir [15]. [24].…”

Section: Kompozit Tamirlerin Uygulamalarının Pişirilmesi İçin Gerekl...unclassified

Elyaf Takviyeli Polimer Tamir Tasarımının Sistematik Tasarım Yöntemi ile Belirlenmesi

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ERDEN

2022

Makina Tasarım Ve İmalat Dergisi

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Bu çalışmada kompozit tamir tasarımının Pahl & Beitz sistematik tasarım yaklaşımı ile karar verilmesi amaçlanmaktadır Bu kapsamda da kompozit tamir tasarımı için gerekli olan tesis kabiliyetleri, maliyet, malzemeye erişebilme gibi mühendislik dışı kriterleri ve dayanım, sağlamlık gibi mühendislik kriterleri sistematik bir yaklaşımla ele alınmaktadır. En yaygın malzemelerden biri olan elyaf takviyeli polimerlerin tamir tasarımı için ihtiyaç listesi, fonksiyon yapısı ve alt fonksiyonları oluşturulmuş ve çözüm varyantları elde edilmiştir. Çözüm varyantları için karar ağacı, değerlendirme çizelgesi ve değer profil diyagramı oluşturulması ile de optimum tasarım belirlenmiştir.

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Out-of-autoclave scarf repair of interlayer toughened carbon fibre composites using double vacuum debulking of patch

Cited by 23 publications

References 34 publications

Fabrication of High Quality, Large Wet Lay-Up/Vacuum Bag Laminates by Sliding a Magnetic Tool

Fabrication of High Quality, Large Wet Lay-Up/Vacuum Bag Laminates by Sliding a Magnetic Tool

Bonded repair of composite structures in aerospace application: a review on environmental issues

Elyaf Takviyeli Polimer Tamir Tasarımının Sistematik Tasarım Yöntemi ile Belirlenmesi

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