scholarly journals Mechanical Characterisation of Carbon Fibre-Reinforced Plastics with Defined Defects

2018 ◽  
Vol 26 (6(132)) ◽  
pp. 126-132
Author(s):  
Moniruddoza Ashir ◽  
Georg Bardl ◽  
Lars Hahn ◽  
Andreas Nocke ◽  
Chokri Cherif
Keyword(s):  
Mechanical Properties ◽  
Carbon Fibre ◽  
Practical Applications ◽  
Reinforced Plastics ◽  
Mechanical Characterisation ◽  
Reinforced Plastic ◽  
Technology Market ◽  
Plastic Components ◽  
Local Defects ◽  
Carbon Fibre Reinforced Plastics

A steadily increasing application of fibre-reinforced plastics in the field of lightweight construction has been observed in the course of the past two decades. Currently a major challenge in the growing high technology market is the quality assurance of manufactured fibre-reinforced plastic components. During different stages in the manufacturing process of fibre-reinforced plastics, defects of different types and sizes are enclosed in them, exerting a destructive influence on the performance of fibre-reinforced plastics in various practical applications in terms of strength, stiffness and brittleness. Thus the aim of this research project was to investigate the effect of defined local defects on the mechanical properties, such as tensile, flexural and impact properties, of fibre-reinforced plastics, in particular carbon fibre-reinforced plastics. Results show that these mechanical properties depend significantly on the type and size of defect.

The Study on Timber Pier Columns Strengthened with Cfrp Hoops in Ancient Architecture

2016 ◽  
Vol 25 (6) ◽  
pp. 096369351602500
Author(s):  
X Y Xiong ◽  
X X Lu ◽  
R J Xue
Keyword(s):  
Mechanical Properties ◽  
Carbon Fibre ◽  
Bearing Capacity ◽  
Theoretical Foundation ◽  
Timber Structure ◽  
Reinforced Plastics ◽  
Universal Formula ◽  
Chinese Architecture ◽  
Carbon Fibre Reinforced Plastics

Timber structure is the mainstream method of ancient Chinese architecture. However due to the effect of weathering and long history, it was badly damaged. Therefore, the protective repairing is imminent. The traditional reinforcement method of pier columns strengthened with iron sheet presents unsatisfactory performance in recovering the bearing capacity, and the study on Carbon Fibre Reinforced Plastics (CFRP) material applying in strengthening pier column is relatively lacking. This paper studied the mechanical properties of 20 timber columns, 17 of which used the CFRP for reinforcement, and one specimen is strengthened with iron sheet. With the maximum bearing capacity of reinforcement columns with CFRP recovering up to 103.22%, the research proves reasonable arrangement of CFRP hoops and suitable strengthening quantity of CFRP could get commendable reinforcement results. Finally, considering the effect of the pier type on the bearing capacity of pier columns, this paper puts forward a more accurate and universal formula compared to Su model, which provides theoretical foundation for restoration projects of ancient architecture.

scholarly journals Engineering of three-dimensional near-net-shape weave structures for high technical performance in carbon fibre–reinforced plastics

2019 ◽  
Vol 14 ◽  
pp. 155892501986123
Author(s):  
Stefan Schindler ◽  
Hans-Jürgen Bauder ◽  
Jürgen Wolfrum ◽  
Jürgen Seibold ◽  
Nemanja Stipic ◽  
...  
Keyword(s):  
Carbon Fibre ◽  
Material Flow ◽  
Three Dimensional ◽  
Cost Accounting ◽  
Reinforced Plastics ◽  
Reinforced Plastic ◽  
Weaving Technology ◽  
Near Net Shape ◽  
Carbon Fibre Reinforced Plastic ◽  
Carbon Fibre Reinforced Plastics

To tap the full potential of reinforcing fibres for lightweight construction of sustainable carbon fibre–reinforced plastic components, woven three-dimensional reinforcement structures open up innovative approaches by integrating functional features. In this work, a novel three-dimensional shuttle weaving technology was taken advantage of to study carbon reinforcement structures with uninterrupted load trajectories from three points of view. Mechanical principals, economic and environmental issues were focused to provide an overall picture. Near-net-shape reinforcement fabrics with load trajectory–compliant yarn paths and interconnected layers that are interwoven in thickness direction were objects of investigation. The effects of a closed fabric selvedge, only producible by shuttle weaving, were investigated too. The here presented novel technology enables complex woven reinforcement structures that otherwise would demand several fabric layers leading to limited properties and lower performance of the carbon fibre–reinforced plastics due to missing interconnections between the layers. The studies on exemplary rods revealed a close relationship between different three-dimensional weave structures and the carbon fibre–reinforced plastic’s mechanical properties. The three-dimensional structures were woven in a single-step process and subsequently infiltrated with epoxy resin in the Vacuum Assisted Process (VAP®) and mechanically tested. Rounding off, universal guidelines for the layout of three-dimensional fabrics for rods were derived therefrom. The economic and environmental aspects of the complete process line were compared to the conventional manufacturing procedures for carbon fibre–reinforced plastic by material flow cost accounting. Looking at sustainability, material flow cost accounting showed that lightweight three-dimensional components with integrated features can be produced cost-effectively with less environmental impact by the novel weaving technology. Its capability for high-quality serial production of three-dimensional reinforcement structures is evident, which was one major result of the work.

scholarly journals Study of thermophysics during diamond drilling of fibreglass and carbon fibre-reinforced polymer composites

2021 ◽  
Vol 25 (3) ◽  
pp. 290-299
Author(s):  
A. S. Dudarev ◽  
E. Kh. Gumarov
Keyword(s):  
Composite Materials ◽  
Carbon Fibre ◽  
Polymer Composite ◽  
Polymer Composite Materials ◽  
Temperature Fields ◽  
Comsol Multiphysics ◽  
Reinforced Plastics ◽  
Reinforced Plastic ◽  
Carbon Fibre Reinforced Plastic ◽  
Carbon Fibre Reinforced Plastics

This paper examines thermophysics of the drilling process of polymeric composite materials, such as carbon-fibre-reinforced plastics (CFRP) and fibreglass by tubular diamond drill bits. Features of the COMSOL Multiphysics engineering software package were used. We employed Fourier heat equations, which express the intensity of heat gain by a mobile source in a moving coordinate system. The research was performed using the proprietary method of modelling spatial thermal action upon drilling polymer composite materials (fibreglass and carbon-fibre-reinforced plastics) in the COMSOL Multiphysics software environment. A tubular diamond drill bit with a diameter of 10 mm with two slots was chosen as a model cutting tool. Solid plates with a thickness of 5.5 mm made of layered fibrous polymer composite materials (fibreglass, carbon-fibre-reinforced plastic) were used as a preform. As a result of computer calculations, we obtained temperature fields of fibreglass and carbon-fibre-reinforced plastic during diamond drilling with a tubular tool. When studying the thermal behaviour of fibreglass and carbon-fibre-reinforced plastics, maximum temperature fields were located. The study revealed that the temperature reaches 413.6 and 448.7 K during CFRP and fibreglass drilling, respectively. It was shown that the distance of heat transfer from the edge of the hole into the preform was 6.42 and 6.40 mm for CFRP and fibreglass, respectively. A method of modelling the thermal effects when cutting polymer composite materials developed in the COMSOL Multiphysics environment allows complex analytical calculations of temperatures induced by drilling to be simplified. In addition, its use prevents overheating of a preform during drilling, allows assessing the depth of heat distribution inside the preform from the edge of the formed hole in different polymer composite materials. These measures increase the machining quality of polymer composite materials.

scholarly journals Mechanical Properties of Thermoplastic-Based Hybrid Laminates with Regard to Layer Structure and Metal Volume Content

Metals ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1430
Author(s):  
Maik Trautmann ◽  
Selim Mrzljak ◽  
Frank Walther ◽  
Guntram Wagner
Keyword(s):  
Mechanical Properties ◽  
Carbon Fibre ◽  
Volume Content ◽  
Layer Structure ◽  
Reinforced Plastics ◽  
Reinforced Plastic ◽  
Metal Volume ◽  
Hybrid Laminates ◽  
Static Tensile ◽  
Hybrid Laminate

Multi layered lightweight material compounds such as hybrid laminates are composed of different layers of materials like metals and unidirectional fibre-reinforced plastics and offer high specific strength. They can be individually tailored for applications like outer cover panels for aircraft and vehicles. Many characteristics especially layer structure, volume contents of the embedded materials as well as layer surface adhesion determine the performance of a hybrid laminate. In this study, the influence of layer structure and metal volume content are evaluated with regard to the mechanical properties of the recyclable hybrid laminate CAPAAL (carbon fibre-reinforced plastics/aluminium foil laminate), which consists of the aluminium alloy AA6082 and a graded structure of glass and carbon fibre-reinforced polyamide 6. Hybrid laminates with different ratios of the fibre-reinforced plastic and numbers of aluminium layers were manufactured by thermal pressing. The consolidation quality of in total four laminate structure variations, including 2/1 and 3/2 metal-to-fibre-reinforced plastic layer structures with fibre orientation variation, were investigated by light microscopy through cross-sections and further on computed tomography. For determination and evaluation of the mechanical properties metrologically instrumented quasi-static tensile and three-point bending tests, as well as tension-tension fatigue tests for the establishment of S-N curves were performed. The results were correlated to the microstructural observations, revealing significant influence by the consolidation quality. The layer structure proved to have a proportional impact on the increase of quasi-static tensile and flexure strength with a decrease in metal volume content. Orienting some of the fibre-reinforced plastic layers in ±45° leads to a more evenly distributed fibre alignment, which results in a higher consolidation quality and less anisotropic bending properties. Fatigue results showed a more complex behaviour where not only the metal volume content seems to determine the fatigue loading capability, but also the number of metal-fibre-reinforced plastic interfaces, hinting at the importance of stress distribution between layers and its longevity over fatigue life.

scholarly journals Studying a grinding method of sapphire pipes using two grinders

2021 ◽  
Vol 25 (3) ◽  
pp. 320-331
Author(s):  
I. V. Savitsky ◽  
V. A. Voytenko
Keyword(s):  
Composite Materials ◽  
Carbon Fibre ◽  
Polymer Composite ◽  
Polymer Composite Materials ◽  
Temperature Fields ◽  
Comsol Multiphysics ◽  
Reinforced Plastics ◽  
Reinforced Plastic ◽  
Carbon Fibre Reinforced Plastic ◽  
Carbon Fibre Reinforced Plastics

This paper examines the thermophysics of a drilling process of polymeric composite materials such as carbonfibre-reinforced plastics (CFRP) and fibreglass by tubular diamond drill bits. Features of the COMSOL Multiphysics engineering software package were used. We employed Fourier heat equations, which express the intensity of heat gain by a mobile source in a moving coordinate system. The research was performed using the proprietary method of modelling spatial thermal action upon drilling polymer composite materials (fibreglass and carbon-fibre-reinforced plastics) in the COMSOL Multiphysics software environment. A tubular diamond drill bit with a diameter of 10 mm with two slots was chosen as a model cutting tool. Solid plates with a thickness of 5.5 mm made of layered fibrous polymer composite materials (fibreglass, carbon-fibre-reinforced plastic) were used as a preform. As a result of computer calculations, we obtained temperature fields of fibreglass and carbon-fibre-reinforced plastic during diamond drilling with the tubular tool. When studying the thermal behaviour of fibreglass and carbon-fibre-reinforced plastics, maximum temperature fields were located. The study revealed that the temperature reaches 413.6 K and 448.7 K during CFRP and fibreglass drilling, respectively. It was shown that the distance of heat transfer from the edge of the hole into the preform was 6.42 and 6.40 mm for CFRP and fibreglass, respectively. A method of modelling the thermal effects when cutting polymer composite materials developed in the COMSOL Multiphysics environment allows complex analytical calculations of temperatures induced by drilling to be simplified. In addition, it helps avoid overheating of a preform during drilling, allows the depth of heat distribution inside the preform from the edge of the formed hole in different polymer composite materials to be assessed. These measures lead to increasing the machining quality of polymer composite materials.

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