Influence of Fibre Heating in PMC Production Technology

2006 ◽  
Author(s):  
A. Gisario ◽  
F. Quadrini ◽  
V. Tagliaferri
Keyword(s):  
Storage Modulus ◽  
Production Technology ◽  
Glass Fibre ◽  
Parallel Plate ◽  
Room Temperature ◽  
Mechanical Tests ◽  
Fibre Content ◽  
Heating Effect ◽  
Composite Fabrication ◽  
Glass Fibre Reinforced

Fibre heating can be employed to optimise composite fabrication in hand lamination. In order to show the fibre heating effect on the properties of hand laminated composites, dynamical and mechanical tests were performed on simply cured glass fibre reinforced laminates and on treated ones. In this second case the fibre content was heated before composite lamination by means of a hot parallel plate press. All the specimens were room temperature cured. A significant increase in storage modulus was observed as an effect of fibre heating as well as a data dispersion reduction. Additionally a lower thickness was measured due to the higher resin fluidity.

The Effects of Winding Angles and Elevated Temperatures on the Crushing Behaviour of Glass Fibre/Epoxy Composite Pipes

2014 ◽  
Vol 695 ◽  
pp. 639-642
Author(s):  
S.N. Fitriah ◽  
M.S. Abdul Majid ◽  
R. Daud ◽  
Mohd Afendi
Keyword(s):  
Compressive Strength ◽  
Glass Fibre ◽  
Room Temperature ◽  
Elevated Temperatures ◽  
Testing Machine ◽  
Universal Testing ◽  
Glass Fibre Reinforced ◽  
Crushing Behavior ◽  
Composite Pipes ◽  
Winding Angle

The paper discusses the crushing behavior of various winding angles of glass fibre reinforced epoxy (GRE) pipes at elevated temperatures. Two different winding angles of composite pipes were chosen for the study; ± 55°, ± 63°. GRE pipes angled ± 55° and ± 63° are compressed using Universal Testing Machine (UTM) at room temperature and elevated temperatures of 45°C, 65°C, and 95°C according to ASTM D695-10 standard. The temperatures were chosen based on the glass transition temperature (Tg) that was measured earlier. The results show that as the temperature is increased, the compressive strength significantly degraded. This is due to the change in the properties of the GRE pipe from a rigid state to a more rubbery state as the composite pipe reached Tg. GRE pipe with winding angle ± 55° show a higher compressive strength compared to ± 63°.

Modelling Processing of Unfilled and Long-Glass Fibre Reinforced Thermoplastics in a Screw-Barrel Unit

2005 ◽  
Author(s):  
M. Moguedet ◽  
J. Balcaen ◽  
Y. Be´reaux ◽  
J.-Y. Charmeau
Keyword(s):  
Viscous Fluid ◽  
Glass Fibre ◽  
Parallel Plate ◽  
Length Distribution ◽  
Fibre Length ◽  
Polymer Processing ◽  
Mixing Efficiency ◽  
Plate Model ◽  
Glass Fibre Reinforced ◽  
Reinforced Thermoplastics

In injection moulding, long glass fibre reinforced thermoplastics (LGFT) are an attractive way to produce large parts at low cost. The strength of the part depends chiefly on the average fibre length, fibres which are subjected to considerable attrition during processing in conventional three stage screws. First of all, in this study we have coupled a melting analysis in a conventional screw to a model of fibre breakage whereby a fibre anchored at one end in the solid bed is submitted, at its other end, to the intense shear stress of the molten polymer flowing in the film close to the barrel. As the melting of the solid bed progresses, more fibres are unlayered and submitted to bending which intensity is depending on both the fibre length and orientation. When the bending is too high, the fibre breaks. Bimodal fibre length distribution are obtained and compared to existing data. The sensibility of the model to main processing parameters such as screw rotation, initial fibre length, viscosity, barrel temperature and screw geometry are also investigated. Next, we present a new analytical solution for flow of a viscous fluid in a single screw channel that takes into account the torsion and curvature of the channel. Contrary to common knowledge in polymer processing based on the Parallel Plate Model, we found that, in the case of cross-sections with large aspect ratio, torsion effects can be significant. The implication of the model on velocity field, residence time and mixing efficiency is investigated and compared to the predictions of the classical Parallel Plate Model, to finite elements calculations, and to 3D experimental measurements. Indeed, an innovating device has been developed in our laboratory to visualize the flow of a viscous fluid in the channel of a screw. It consists of a transparent barrel and of a rotating screw, pumping a transparent viscous fluid at room temperature. A particle plunged in the flow is constantly monitored by four video-cameras placed around the barrel and recording its position in a frame. The 3D path lines are then computed.

scholarly journals Influence of the Fibre Content, Exposure Time, and Compaction Pressure on the Mechanical Properties of Ultraviolet-Cured Composites

2020 ◽  
Vol 4 (1) ◽  
pp. 30
Author(s):  
Natalia G. Pérez-de-Eulate ◽  
Ane Aranburu Iztueta ◽  
Koldo Gondra ◽  
Francisco Javier Vallejo
Keyword(s):  
Mechanical Properties ◽  
Exposure Time ◽  
Glass Fibre ◽  
Compaction Pressure ◽  
Uv Curing ◽  
Fibre Content ◽  
New Process ◽  
Glass Fibre Reinforced ◽  
Interlaminar Shear ◽  
Traditional Manufacturing

A new process for the impregnation, consolidation, and curing of glass-fibre-reinforced polyester composites was developed to reduce manufacturing costs and secure end properties that compete with other traditional materials. This new process, based on the ultraviolet (UV) curing of prepregs, could be a viable alternative to infusion and other processes. In this paper, we showed that glass fibre composites 3 mm thick could be easily formed using suitable photoinitiating systems. We achieved improved mechanical properties through the application of favourable parameters to traditional manufacturing processes such as hand lay-up and infusion. The prepreg polymerization was monitored by dielectric analysis (DEA), and we evaluated the relationship between the UV radiation exposure time and curing degree. Both the exposure time and compaction pressure affected the fibre content of composites and interlaminar shear strength. Experimental results showed that compaction pressures higher than 4 bar are necessary to increase the mechanical properties of the UV-cured composites. Finally, the properties of the composites manufactured by this new process were compared to the properties of composites manufactured using traditional processes such as hand lay-up and infusion.

Thermal and water ageing effect on mechanical, rheological and morphological properties of glass-fibre-reinforced poly(oxymethylene) composite

2018 ◽  
Vol 233 (2) ◽  
pp. 211-224 ◽  
Author(s):  
Emel Kuram
Keyword(s):  
Tensile Strength ◽  
Flexural Strength ◽  
Glass Fibre ◽  
Room Temperature ◽  
Ageing Time ◽  
Melt Flow Index ◽  
Morphological Properties ◽  
Flow Index ◽  
Melt Flow ◽  
Glass Fibre Reinforced

In this study, the ageing behaviour of glass-fibre-reinforced poly(oxymethylene) composite at different conditions was investigated. The ageing was performed in various controlled environments, namely in air at room temperature, in water at room temperature and in an oven at the temperature of 100 ℃. Tensile and flexural tests were conducted to determine the mechanical properties, melt flow index was measured to determine the rheological property and scanning electron microscopy was used to observe the morphological property of unaged and aged poly(oxymethylene) samples. A reduction in both tensile and flexural strength was observed with all ageing environment. The worst strength retention was obtained with water ageing. Water absorbed by glass-fibre-reinforced poly(oxymethylene) composite had a detrimental influence on the tensile and flexural strength. Tensile strength was affected by the ageing environments. The decrease in the tensile strength of air and thermally aged poly(oxymethylene) was slower than that of water aged poly(oxymethylene), and the tensile strength of aged samples decreased as the ageing time increased. The combined actions of heat, air and water (thermal + water + air ageing) did not further degrade glass-fibre-reinforced poly(oxymethylene) compared to only water ageing at the room temperature. All tensile stress–strain and flexural load–deflection curves showed the similar tendency and did not change with ageing environments and time. All aged samples showed higher melt flow index values than that of unaged sample and the changes in melt flow index could be an indicator of degradation.

Fabrication and Properties of Glass Fibre Reinforced Fly Ash-Cement Roofing Tiles

2018 ◽  
Vol 911 ◽  
pp. 83-87 ◽  
Author(s):  
G.L.M. Ariyadasa ◽  
S. Upali Adikary ◽  
S.S.K. Muthuratne
Keyword(s):  
Particle Size ◽  
Fly Ash ◽  
Glass Fibre ◽  
Coal Fly Ash ◽  
High Water ◽  
Mechanical Tests ◽  
Dry Density ◽  
Transverse Strength ◽  
Glass Fibre Reinforced ◽  
Similar Density

In this study Glass fibre reinforced fly ash -cement roofing tiles were fabricated using three different forms of coal fly ash (CFA) such as CFA as it is, CFA particle sizes below 75μm and below 45μm.The separated CFA was used to replace cement 30% by the weight and those matrices were reinforced by Alkali Resistant (AR) glass fibres adding 1% and 2% by weight.The corrugated roof tiles have dimensions of 490×250×8mm and they were hand cast using ordinary vibration. Physical and mechanical tests were performed after 28 days of aging. The tiles were tested in accordance with SLS 1189. Transverse strength increased with increasing fibre percentage. Further, the transverse strength decreased with decreasing CFA particle size. Highest characteristic transverse strength was observed in the CFA as it is sample which is 1650N and the lowest from CFA below 45µm particle size sample which is 1240N. However, all the samples satisfy the strength requirement which is 230N. High water absorption was observed in all the samples which is around 20%.The dry density was ranged in between 1.62-1.68g/cm3 .The lowest average dry density was observed in CFA as it is samples whereas CFA below 75μm particle size and CFA below 45μm particle size samples showed similar density values. The dry density of tile samples is in comparable with the dry density of asbestos cement sheets (≈1.63g/cm3) and the characteristic transverse strength is in comparable with Calicut clay tiles (1000-2000N) in Sri Lanka. Therefore, glass fibre reinforced fly ash-cement roofing tiles are promising substitute for asbestos roofing sheets.

Damping Factor and Dynamic Mechanical Analysis of Glass Fibre Reinforced Polyester Composite

2019 ◽  
Vol 11 (3) ◽  
Author(s):  
G. Sathishkumar ◽  
R. Sridhar ◽  
S. Sivabalan ◽  
S. Joseph Irudaya Raja
Keyword(s):  
Dynamic Mechanical Analysis ◽  
Storage Modulus ◽  
Glass Fibre ◽  
Loss Modulus ◽  
Fibre Length ◽  
Mechanical Analysis ◽  
Fibre Content ◽  
Damping Factor ◽  
Dynamic Mechanical ◽  
Polyester Composite

This study aims to evaluate the result of experimental examination conducted on free vibration characteristics and dynamic mechanical analysis over a range of temperature and five different frequencies of short glass fibre polyester composite. The effect of temperature on the storage modulus, loss modulus, and damping efficiency (tan δ) is determined. Synthetic reinforced material is created in random fibre orientation using hand lay-up method by domination of fibre length (10mm) and weight percent (5, 10, 15, 20%). Improvement in the fibre content will make a rise in the natural frequency and the storage modulus is maximum when fibre content of 20wt. % is introduced to the composite materials in the temperature ranges of 300-800°C. The peak of loss modulus and damping curves were lowered with respect to the fibre content. The properties were compared with neat polyester.

A microstructural approach for modelling flexural properties of long glass fibre reinforced polyamide6.6

2016 ◽  
Vol 51 (1) ◽  
pp. 3-16 ◽  
Author(s):  
E Lafranche ◽  
A Coulon ◽  
P Krawczak ◽  
JP Ciolczyk ◽  
E Gamache
Keyword(s):  
Flexural Strength ◽  
Glass Fibre ◽  
Flexural Modulus ◽  
Processing Condition ◽  
Fibre Diameter ◽  
Fibre Length ◽  
Fibre Content ◽  
Distribution Model ◽  
Second Phase ◽  
Glass Fibre Reinforced

This paper focuses on the development and the validation of flexural modulus and flexural strength predictive models of long glass fibre reinforced polyamide 6.6 (PA66). Based on previous injection moulding optimization of 40 wt% long glass fibre PA66, a microstructure analysis was investigated on glass fibre reinforced PA66 by varying the parameters of the material (fibre length, fibre content, fibre diameter). In a first phase, analytical models established within the framework of the processing condition limits previously determined have been elaborated. These models lead to a good experimental/calculation correlation but remain limited to a mould and part design. In a second phase the flexural modulus and maximal flexural stress have been then estimated from structural models based on a five layer morphological description of the composites (local residual fibre length, local fibre content and fibre orientations). The long glass fibre PA66 composites were characterized in terms of fibre content distribution model and fibre orientation model through the part thickness. The experimental/model correlation was achieved whatever the process variability is (mould, material and processing conditions) both for the flexural modulus or flexural strength. The models have been then validated with an industrial part. Finally, a correlation between the two studied properties has been revealed depending on the nature of the composite matrix (PA66, PA6 or PP).

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