scholarly journals Vacuum Infusion Simulation for Radome Manufacturing Using Woven Flax Fibre and Glass Fibre

2021 ◽  
Vol 88 (3) ◽  
pp. 49-56
Author(s):  
Mohd Yusoff Mohd Haris ◽  
Khairul Dahri Mohd Aris ◽  
Muzafar Zulkifli ◽  
Tajul Adli Abdul Razak ◽  
Nurul Zuhairah Mahmud Zuhudi
Keyword(s):  
Glass Fibre ◽  
Flax Fibre ◽  
Wall Structure ◽  
Thin Wall ◽  
Gel Time ◽  
Fibre Glass ◽  
Ansys Fluent ◽  
Filling Time ◽  
Injection Line ◽  
Air Vent

The vacuum infusion method is emerging to produce composite parts, especially thin wall structure aircraft radome. Ansys Fluent is used in the optimization phase for mould filling analysis on aircraft radome part. The permeability fibre is referring to the physical property of the fibre reinforcement to allow fluids to permeate it, thus it is correlated with the viscosity of the resin used. In this work, flax fibre, glass fibre and low viscosity epoxy resin are used to determine the permeability value of flax fibre, glass fibre and hybrid without using a flow medium. In-plane experiment on reinforcement fibre permeability is conducted and all reinforcement fibre have similar fibre architecture and weight. The development of a digital model from a top partial aircraft radome is obtained through a 3D scanner and CATIA. Ansys Fluent is used to optimize the location of the injection line and air vent for the epoxy. The Ansys Fluent analysis model is validated through the in-plane experiment filling time result for a flat model. Based on the simulation analysis, the location of the injection line is placed at the perimeter and the air vent at the centre. The filling time from the simulation for the flax fibre and hybrid fibre was estimated around 10 to 11 minutes. However, the filling time for glass fibre is approximate 2 hours which is longer than epoxy gel time. Furthermore, this method can be used in mould filing scenarios of thin wall structure within gel time of the resin.

Effect of ethanol on the mold filling-time and mechanical properties of woven glass fiber reinforced epoxy filled with TiO2 nanoparticles

2020 ◽  
pp. 152808372097134
Author(s):  
Sherif M Youssef ◽  
M Megahed ◽  
Soliman S Ali-Eldin ◽  
MA Agwa
Keyword(s):  
Mechanical Properties ◽  
Composite Laminates ◽  
Cost Effective ◽  
Mold Filling ◽  
High Viscosity ◽  
Ansys Fluent ◽  
Glass Fiber Reinforced ◽  
Filling Time ◽  
Ethanol Addition ◽  
Woven Glass Fiber

Vacuum resin infusion (VRI) is a promising technique for manufacturing complicated structural laminates. This high viscosity of nanofilled resin increases the filling time and leads to an incomplete mold filling. The mold filling time can be reduced either by making the fiber dimensions smaller than the mold (gaps around the fibers) or by adding ethanol to nanofilled epoxy. However, ethanol addition influences the mechanical properties of composite laminates. In this study, different amounts of ethanol (0.5 wt. % and 1 wt. %) were used as a diluent to both neat epoxy and epoxy filled with (0.25 wt. %) of titanium dioxide (TiO2) nanoparticles. From results, it was found that ethanol addition saves the time for neat and nanofilled epoxy by 47.1% and 24.1%, respectively. It was found that adding 0.5 wt. % of ethanol to 0.25wt. % of TiO2 nanoparticles (GT0.25E0.5) enhances the tensile and flexural strength by 30.8% and 55.9%, respectively compared with neat specimens. Furthermore, the tensile and flexural moduli increased by 62% and 72.3%, respectively. Furthermore, the mold filling time was investigated experimentally and validated numerically using ANSYS FLUENT software. The mold filling time prediction using ANSYS FLUENT can be used to avoid resin gelation before the incomplete mold filling and thus can be considered a cost-effective methodology. The results showed that the gaps around the fibers reduce the time by 178% without affecting the mechanical properties.

Reconstructing dynamic load acting on an element of a thin-wall structure

2000 ◽  
Vol 36 (7) ◽  
pp. 531-534
Author(s):  
A. O. Vatul’yan ◽  
V. M. Dragilev ◽  
L. L. Dragileva
Keyword(s):  
Dynamic Load ◽  
Wall Structure ◽  
Thin Wall

Dynamic response of a thin-wall structure to axial loading

1986 ◽  
Vol 22 (3) ◽  
pp. 353-360
Author(s):  
V. I. Patsyuk ◽  
V. K. Rimskii
Keyword(s):  
Dynamic Response ◽  
Axial Loading ◽  
Wall Structure ◽  
Thin Wall

Multiphase Fluid Flow in Porous-Fibrous Media: Fundamentals, Mathematical Modeling and Applications on Polymeric Composites Manufacturing

2018 ◽  
Vol 20 ◽  
pp. 55-77
Author(s):  
T.R. Nascimento Porto ◽  
A.G. Barbosa de Lima ◽  
W.F. de Amorim Júnior
Keyword(s):  
Mathematical Modeling ◽  
Fluid Flow ◽  
Industrial Applications ◽  
Volumetric Fraction ◽  
Fibrous Media ◽  
Molding Process ◽  
Ansys Fluent ◽  
Composite Manufacturing ◽  
Filling Time ◽  
Multiphase Fluid

This work provides information about polymer composite manufacturing by using liquid composite material molding, with particular reference to resin transfer molding process (RTM). Herein, several topics related to porous media, fluid flow, mathematical modeling, computational methods, composite manufacturing and industrial applications were presented. Simulation of resin flow into a fibrous (reinforcement) inserted in a parallelepiped mold has been performed, using the Ansys FLUENT®software, and different results of resin volumetric fraction, stream lines and pressure distribution inside the mold, and volumetric fraction always flow rate (inlet and outlet gates) of the resin, as a function of filling time, have been presented and discussed.

The fabrication of thin wall structure with novel laser vaporizing sintering

2008 ◽  
Author(s):  
Jimin Chen ◽  
Pengfei Lv ◽  
Daqing Sun ◽  
Jun Shao
Keyword(s):  
Wall Structure ◽  
Thin Wall

scholarly journals Self-Sensing Hybrid Composite Rod with Braided Reinforcement for Structural Health Monitoring

2012 ◽  
Vol 730-732 ◽  
pp. 379-384 ◽  
Author(s):  
Katherine P. Rosado Mérida ◽  
Sohel Rana ◽  
Cristiana Gonilho-Pereira ◽  
Raul Fangueiro
Keyword(s):  
Structural Health Monitoring ◽  
Carbon Fibre ◽  
Health Monitoring ◽  
Glass Fibre ◽  
Traffic Monitoring ◽  
Strain Sensitivity ◽  
Strain Sensing ◽  
Braided Composites ◽  
Fibre Glass ◽  
Structural Health

Enhancing the performance and lightness of different structures has already been achieved by the employment of fibre reinforced composite materials. Nowadays, a new challenging perspective is being given to these materials by the inclusion of non-metallic conductive components. This emerging technology will lead to multifunctional composites with possible applications in structural health monitoring and traffic monitoring. The aim is to avoid corrosion problems from metallic components, as well as to eliminate the need of expensive equipments used for the health monitoring of large infrastructures. In the present research, the strain-sensing capability of a core-reinforced hybrid carbon fibre/glass fibre braided composite has been investigated in order to develop continuous monitoring system. The characterization of sensing behaviour was performed with the help of an instrumental set-up capable of measuring the change in electrical resistance with mechanical stresses applied to the samples. The effect of core composition (carbon fibre/glass fibre weight ratio) on the strain sensitivity of the braided composites has been studied in order to find out the optimum composition for best sensing capability. Among the three compositions studied (23/77, 47/53 and 100/0), composites with lowest amount of carbon fibre showed the best strain sensitivity with gauge factors up to 23.4 at very low flexural strain (0.55%). Attempts have also been made in this research to develop a piezoresistive matrix for the braided composites in order to further enhance their strain sensitivity. For this purpose, the strain sensing capability of an unsaturated polyester matrix dispersed with chopped carbon fibres (1mm and 3 mm lengths) at various weight % (0.5, 0.75 and 1.25%) was evaluated in order to find out their optimum length and concentration. It was observed that chopped fibres with different lengths showed similar strain sensitivity, which however, improves with the decrease in their concentrations.

Mechanical Behaviour of Cement Concrete using Fibres

2018 ◽  
Vol 6 (04) ◽  
Author(s):  
Gaurav Vats ◽  
Preeti Kuhar ◽  
Sanjeev Kumar
Keyword(s):  
Glass Fibre ◽  
Steel Fibre ◽  
Weight Fraction ◽  
Single Fibre ◽  
Polyamide Fibre ◽  
Mix Design ◽  
Modern Time ◽  
Cement Concrete ◽  
Fibre Glass ◽  
Concrete Matrix

Concrete is the most used material for the construction in the modern time of infrastructures. Concrete is strong in compression but it is weak in tension and shear. To minimise those problems, fibres were introduced in concrete to enhance its tensile strength and shear strength. In my present investigation, the mechanical properties of fibres reinforced concrete are studied by using steel fibre, glass fibre and polyamide fibre with a different weight fraction of fibres with respect to cement. The mix design of M25 concrete with W/C ratio of 0.42 is prepared and total thirteen mixes included one control mix was prepared and tested in the laboratory. The total quantity of fibres mixed in the concrete are in order of 0%, 0.75%, 1.5%, and 2.25% by weight of cement and one mix contains 0.33% of glass fibre, 0.33% of steel fibre and 0.33% of polyamide. The study shows that the mixed fibres provide better properties in controlling cracks and high strengths than single fibre and concrete without fibre. On increasing the percentage of fibres beyond 1.5%, the strength of the concrete matrix decrease due to mat form of fibres or non-uniform distribution of fibres and also decrease due to non-cohesiveness of the concrete particle to each other.

Comparison Analysis of Piezoelectric Vibration Control Methods for Autobody Thin-Wall Structure

2013 ◽  
Vol 376 ◽  
pp. 411-416 ◽  
Author(s):  
Chuan Liang Shen ◽  
Xiao Wen An ◽  
Ye Han ◽  
Da Xue Wang
Keyword(s):  
Finite Element ◽  
Vibration Control ◽  
Control Variable ◽  
Wall Structure ◽  
Thin Wall ◽  
Control Methods ◽  
Proportional Control ◽  
Piezoelectric Elements ◽  
Modal Space ◽  
Derivative Control

The piezoelectric materials have the positive and inverse piezoelectric effects. The piezoelectric elements can be served as actuators and sensors. The piezoelectric elements are adopted to control the vibration of autobody thin-wall structure. The proportional control, proportional-derivative control and independent modal space control based on LQR (Linear Quadratic Regulator) are simulated by using finite element method. The piezoelectric patched autobody thin-wall structure is simplified to a square plate with peripheral clamped boundary. The finite element model is established. The central node displacement is monitored as a control variable in these control methods. Central patched plate and surrounding patched plate are analyzed under the three control methods. The effectiveness of vibration control is obtained. Compared with proportional control, the proportional-derivative control has advantage of oscillation suppression at the beginning vibration control and has more obvious vibration control effectiveness. Compared with the above two control methods, the independent modal space control based on LQR has a better stability and vibration suppression effectiveness.

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