Glass fibers reinforced polymer composites have been prepared by various manufacturing technology and are widely used for various applications. Initially, ancient Egyptians made containers by glass...

Glass fiber-reinforced polymer composites – a review:

Heteroatom-doped graphene materials have been intensely studied as active electrodes in energy storage devices. Here, we demonstrate that boron-doped porous graphene can be prepared in ambient air using a facile laser induction process from boric acid containing polyimide sheets. At the same time, active electrodes can be patterned for flexible microsupercapacitors. As a result of boron doping, the highest areal capacitance of as-prepared devices reaches 16.5 mF/cm2, 3 times higher than nondoped devices, with concomitant energy density increases of 5–10 times at various power densities. The superb cyclability and mechanical flexibility of the device are well-maintained, showing great potential for future microelectronics made from this boron-doped laser-induced graphene material.

Flexible Boron-Doped Laser-Induced Graphene Microsupercapacitors.

Weight reduction and improved damage tolerance characteristics were the prime drivers to develop new family of materials for the aerospace/aeronautical industry. Aiming this objective, a new lightweight Fiber/Metal Laminate (FML) has been developed. The combination of metal and polymer composite laminates can create a synergistic effect on many properties. The mechanical properties of FML shows improvements over the properties of both aluminum alloys and composite materials individually. Due to their excellent properties, FML are being used as fuselage skin structures of the next generation commercial aircrafts. One of the advantages of FML when compared with conventional carbon fiber/epoxy composites is the low moisture absorption. The moisture absorption in FML composites is slower when compared with polymer composites, even under the relatively harsh conditions, due to the barrier of the aluminum outer layers. Due to this favorable atmosphere, recently big companies such as EMBRAER, Aerospatiale, Boing, Airbus, and so one, starting to work with this kind of materials as an alternative to save money and to guarantee the security of their aircrafts.

/pdf/a-review-on-the-development-and-properties-of-continuous-54nax2ejil.pdf

A review on the development and properties of continuous fiber/epoxy/aluminum hybrid composites for aircraft structures

http://dspace.nitrkl.ac.in/dspace/bitstream/2080/183/1/JCIS-BCRAY-14.pdf

Temperature effect during humid ageing on interfaces of glass and carbon fibers reinforced epoxy composites.

Voids, the most studied type of manufacturing defects, form very often in processing of fiber-reinforced composites. Due to their considerable influence on physical and thermomechanical properties ...

https://journals.sagepub.com/doi/pdf/10.1177/0021998318772152

Voids in fiber-reinforced polymer composites: A review on their formation, characteristics, and effects on mechanical performance:

The influence of porosity on the interlaminar shear strength of carbon/epoxy and carbon/bismaleimide fabric laminates

Reinforced thermoplastic structural detail parts and assemblies are being developed to be included in current aeronautic programs. Thermoplastic composite technology intends to achieve improved properties and low cost processes. Welding of detail parts permits to obtain assemblies with weight reduction and cost saving. Currently, joining composite materials is a matter of intense research because traditional joining technologies are not directly transferable to composite structures. Fusion bonding and the use of thermoplastic as hot melt adhesives offer an alternative to mechanical fastening and thermosetting adhesive bonding. Fusion bonding technology, which originated from the thermoplastic polymer industry, has gained a new interest with the introduction of thermoplastic matrix composites, which are currently regarded as candidate for primary aircraft structures. This paper reviewed the state of the art of the welding technologies devised to aerospace industry, including the fields that Universidade Estadual Paulista Julio de Mesquita Filho and Universidade de Sao Paulo are deeply involved.

/pdf/a-review-of-welding-technologies-for-thermoplastic-lcltqkleoj.pdf

A Review of Welding Technologies for Thermoplastic Composites in Aerospace Applications

This study assesses the effect of porosity in the moisture absorption of polymeric composites. The preparation of composites samples with porosity, control, and measurement of void content, and moisture absorption behavior of carbon/epoxy laminates are discussed. Rheological analyses are used to characterize the viscosity behavior of prepregs either in the presence or absence of moisture. Polymeric composites with different levels of voids were produced and submitted to hygrothermal conditioning to study the moisture absorption behavior. It was found that the rate of water uptake and the maximum level of moisture absorption in carbon/epoxy composites depends on the void content and specimen geometry. The dependence on the void content may be quite significant. The nature of the matrix system was also verified to affect the moisture absorption properties of the composite.

Effect of Void Content on the Moisture Absorption in Polymeric Composites

This review provides valuable information about the general characteristics, processing conditions and physical properties of carbon nanotube buckypaper (BP) and its polymer composites. Vacuum filtration is the most common technique used for manufacturing BP, since the carbon nanotubes are dispersed in aqueous solution with the aid of surfactant. Previous works have reported that mechanical properties of BP prepared by vacuum filtration technique are relatively weak. On the other hand, the incorporation of polymer materials in those nanostructures revealed a significant improvement in their mechanical behavior, since the impregnation between matrix and BP is optimized. Electrical conductivity of BP/polymer composites can reach values as high as 2000 S/m, which are several orders of magnitude greater than traditional CNT/polymer composites. Also, BP can improve remarkably the thermal stability of polymer matrices, opening new perspectives to use this material in fire retardant applications.

/pdf/carbon-nanotube-buckypaper-reinforced-polymer-composites-a-1s4suage80.pdf

Carbon nanotube buckypaper reinforced polymer composites: a review

It is well known that voids and environmental conditions may affect the strength of composite laminates. Despite the fact that voids facilitate moisture absorption, the effect of voids on the composite laminates in the presence of moisture has not been addressed in the literature. Moreover, most of the attention has been focused on composites made of unidirectional carbon-epoxy prepreg tape. This article presents experimental results on the combined effect of voids and moisture in polymer composites. The experiments consider two types of reinforcement (eight harness satin fabric and unidirectional tape), two types of resin systems (epoxy and bismaleimide), and two types of loading (interlaminar shear and compression). The effect of these factors on the fracture parameters of laminates with and without environmental conditioning is discussed.

Michelle Leali Costa

Papers

The influence of porosity on the interlaminar shear strength of carbon/epoxy and carbon/bismaleimide fabric laminates

A Review of Welding Technologies for Thermoplastic Composites in Aerospace Applications

Effect of Void Content on the Moisture Absorption in Polymeric Composites

Carbon nanotube buckypaper reinforced polymer composites: a review

Strength of hygrothermally conditioned polymer composites with voids