scholarly journals Elastomer Characterization Method for Trapped Rubber Processing

Polymers ◽  
2020 ◽  
Vol 12 (3) ◽  
pp. 686 ◽  
Author(s):  
Pooria Khalili ◽  
Thomas Boulanger ◽  
Brina J. Blinzler
Keyword(s):  
Thermal Conductivity ◽  
Polymer Matrix ◽  
High Pressures ◽  
Polymer Matrix Composites ◽  
Dynamic Change ◽  
Experimental Tests ◽  
High Volume ◽  
Virtual Design ◽  
Closed Cavity ◽  
Recent Advances

The increasing high-volume demand for polymer matrix composites (PMCs) brings into focus the need for autoclave alternative processing. Trapped rubber processing (TRP) of PMCs is a method capable of achieving high pressures during polymer matrix composite processing by utilizing thermally induced volume change of a nearly incompressible material inside a closed cavity mold. Recent advances in rubber materials and computational technology have made this processing technique more attractive. Elastomers can be doped with nanoparticles to increase thermal conductivity and this can be further tailored for local variations in thermal conductivity for TRP. In addition, recent advances in computer processing allow for simulation of coupled thermomechanical processes for full part modeling. This study presents a method of experimentally characterizing prospective rubber materials. The experiments are designed to characterize the dynamic in situ change in temperature, the dynamic change in volume, and the resulting real-time change in surface pressure. The material characterization is specifically designed to minimize the number and difficulty of experimental tests while fully capturing the rubber behavior for the TRP scenario. The experimental characterization was developed to provide the necessary data for accurate thermomechanical material models of nearly incompressible elastomeric polymers for use in TRP virtual design and optimization.

Anisotropy of thermal conductivity in 3D printed polymer matrix composites for space based cube satellites

2017 ◽  
Vol 16 ◽  
pp. 186-196 ◽  
Author(s):  
Corey Shemelya ◽  
Angel De La Rosa ◽  
Angel R. Torrado ◽  
Kevin Yu ◽  
Jennifer Domanowski ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Polymer Matrix ◽  
Polymer Matrix Composites ◽  
Matrix Composites ◽  
3D Printed

scholarly journals Experimental Analysis on the Application of Polymer Matrix Composites Containing Al2O3 for Automotive Lamp Reflector

2019 ◽  
Vol 9 (21) ◽  
pp. 4525
Author(s):  
Young Shin Kim ◽  
Jae Kyung Kim ◽  
Seung Jun Na ◽  
Euy Sik Jeon
Keyword(s):  
Thermal Conductivity ◽  
Polymer Matrix ◽  
Experimental Analysis ◽  
Heat Dissipation ◽  
Polymer Matrix Composites ◽  
Morphological Characteristics ◽  
Maximum Temperature ◽  
Matrix Composites ◽  
Polybutylene Terephthalate ◽  
Light Quantity

As automotive lamps are highly integrated, the heat generated from bulbs reduces the light quantity and lifespan of the bulbs. Numerous studies have been actively conducted worldwide on heat dissipation designs and material modifications for heat release. In this study, an analysis was carried out of the mechanical, thermal, and morphological characteristics of Polybutylene Terephthalate (PBT) and Polyamide (PA6) matrix composites containing alumina filler; further, their flowability and injection moldability were also studied. The PA6 matrix that was subjected to an addition of 60% alumina was selected as the sample. To compare the performances of the selected composites with that of the fog lamp reflector manufactured with conventional PBT, fog lamp reflectors were fabricated. When 60% alumina was added, the thermal conductivity was improved. Thus, the maximum temperature of the lamp reflector was reduced, and the heat was transferred to the surroundings; this was in contrast to the fog lamp reflector fabricated with conventional PBT.

Numerical Investigation of Thermal Conductivity of Particle Dispersive Composites Based on Fractal Method

2012 ◽  
Vol 616-618 ◽  
pp. 1808-1812
Author(s):  
Xiao Chuan Li ◽  
Xiang Yong Huang
Keyword(s):  
Thermal Conductivity ◽  
Heat Conduction ◽  
Polymer Matrix ◽  
Volume Fraction ◽  
Polymer Matrix Composites ◽  
Fractal Theory ◽  
High Heat ◽  
Matrix Composites ◽  
Filling Fraction ◽  
High Heat Transfer

Heat conduction performance of particle dispersive composites has been numerically investigated by using Finite volume method (FVM) and fractal theory. The effects of the thermal conductivity of particle and polymer matrix, the volume fraction of conductive particle, the dispersion and reunion form of particles on the effective thermal conductivity of composites are analyzed in detail. Results from the research indicate that thermal conductivities of composites will increase nonlinearly along with the increase of filling fraction of particles. Keeping the filling fraction constant, the dispersion and reunion form and direction of particles has significant effect on heat conduction performance of composite. Simple use of high thermal conductivity particles has limited effect on thermal performance of composites. Enhancing the contacts of particle in the direction of heat exchange and forming high heat transfer channels are the main and economical ways to improve heat conduction performance of particulate filled polymer matrix composites.

scholarly journals Improving the thermal conductivity of epoxy composites using a combustion-synthesized aggregated β-Si3N4 filler with randomly oriented grains

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Akihiro Shimamura ◽  
Yuji Hotta ◽  
Hideki Hyuga ◽  
Mikinori Hotta ◽  
Kiyoshi Hirao
Keyword(s):  
Thermal Conductivity ◽  
Polymer Matrix ◽  
High Performance ◽  
Heat Dissipation ◽  
Filler Content ◽  
Polymer Matrix Composites ◽  
Conductive Polymer ◽  
Epoxy Composites ◽  
Industry Applications ◽  
Thermal Conductivities

AbstractElectrically insulating and thermally conductive polymer matrix composites are desirable for industry applications as they improve the reliability of high-performance electronic devices, particularly via heat dissipation in devices loaded with several electronic components. In this study, an aggregated β-Si3N4 filler with randomly oriented grains was produced via combustion synthesis to improve the thermal conductivity of epoxy composites. The thermal conductivities of the prepared composites were investigated as a function of the filler content, and the values were compared to those of composites loaded with commercial β-Si3N4 (non-aggregated). Negligible difference was observed in the thermal conductivities of both types of composites when the Si3N4 content was below 40 vol%; however, above 40 vol%, the aggregated β-Si3N4 filler-loaded composites showed higher thermal conductivities than the commercial β-Si3N4-loaded composites. The aggregated β-Si3N4 filler-loaded composites exhibited isotropic thermal conductivities with a maximum value of 4.7 W m−1 K−1 at 53 vol% filler content, which is approximately 2.4 times higher than that of the commercial β-Si3N4-loaded composites, thereby suggesting that the morphology of the aggregated filler would be more efficient than that of the commonly used non-aggregated filler in enhancing the thermal conductivity of a polymer matrix composite.

Integrated Defect Classification in Manufacturing of Carbon Fibre Reinforced Thermoplastic Polymer Matrix Composites

2016 ◽  
Vol 879 ◽  
pp. 554-559 ◽  
Author(s):  
Michael Fischlschweiger ◽  
Alexander Stock ◽  
Markus Thurmeier
Keyword(s):  
Quality Control ◽  
Carbon Fibre ◽  
Polymer Matrix ◽  
High Performance ◽  
Polymer Matrix Composites ◽  
Cost Effective ◽  
High Volume ◽  
Matrix Composites ◽  
Thermoplastic Polymer ◽  
Part Quality

Thermoplastic polymer matrix composites with continuous carbon fibre reinforcements are of crucial relevance in automotive industry. The mix of high performance and cost effective manufacturing makes them attractive for high volume production. However, it could be shown that production integrated end of line quality control is of strong importance to ensure continuous and traceable part quality. Besides, typical non destructive testing method specifications, higher production volumes additionally require short testing times. Herein, the application of active thermography as end of line quality control in composite production is evaluated and compared with results obtained by X-ray radiometry. It could be revealed that transient pulse phase thermography is a powerful tool to analyse part quality of continuous thermoplastic polymer matrix composites in short testing times.

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