Correlation between the strength and thermal conductivity of glass-reinforced plastics

1972 ◽  
Vol 5 (4) ◽  
pp. 660-662
Author(s):  
V. F. Zinchenko
Keyword(s):  
Thermal Conductivity ◽  
Reinforced Plastics

Some results of investigation of the thermal conductivity of fiber glass-reinforced plastics

1975 ◽  
Vol 29 (1) ◽  
pp. 870-872 ◽  
Author(s):  
Yu. G. Narozhnyi ◽  
Yu. V. Polezhaev ◽  
V. N. Kirillov
Keyword(s):  
Thermal Conductivity ◽  
Fiber Glass ◽  
Reinforced Plastics

Thermal conductivity of reinforced plastics

Composites ◽  
1970 ◽  
Vol 1 (4) ◽  
pp. 256 ◽  
Author(s):  
D.M. Sundstrom ◽  
S.Y. Chen
Keyword(s):  
Thermal Conductivity ◽  
Reinforced Plastics

Prediction of Extent of Heat Affected Zone in Laser Grooving of Unidirectional Fiber-Reinforced Plastics

1998 ◽  
Vol 120 (4) ◽  
pp. 321-327 ◽  
Author(s):  
C. T. Pan ◽  
H. Hocheng
Keyword(s):  
Thermal Conductivity ◽  
Heat Source ◽  
Heat Affected Zone ◽  
Fiber Orientation ◽  
Thermal Damage ◽  
Laser Energy ◽  
Fiber Axis ◽  
Unidirectional Fiber ◽  
Reinforced Plastics ◽  
Fiber Reinforced Plastics

Laser has been widely used in various industrial applications including machining. However, in shaping operation of composite material after curing, thermal damage associated with laser energy can be produced. It leads to poor assembly tolerance and long-term performance deterioration. The current research investigates the anisotropic formation of the heat affected zone (HAZ) in unidirectional fiber-reinforced plastics induced by laser grooving. Preliminary analytical and experimental analysis reveal that the laser energy per unit length and fiber orientation-dependent thermal conductivity primarliy determine the induced thermal damage. The extent of HAZ is estimated by the isotherm of the matrix char temperature. Heat conduction is maximum along the fibers, and the HAZ shape is thus affected by the beam scanning direction relative to fiber orientation. The study investigates the grooving of laminated unidirectional carbon/epoxy, which demonstrates clear thermal damage in 90 degree (i.e., perpendicular grooving), 60 degree, 30 degree, and 0 degree (i.e., parallel grooving) relative to the fiber axis. A theoretical analysis based on moving point heat source is adopted to determine the extent of thermal damage in correlation with process parameters and material properties. Mirror Image Method is used for specimen of finite thickness. Considerations of temperature-dependence of thermal conductivity and the emmerged heat source further improve the prediction of HAZ. While HAZ in grooving along the principal material axes can be solved analytically, conductivity ellipsoid and finite difference can calculate the extent of HAZ induced by grooving in any direction relative to fiber axis.

Improvement on the Cutting Performance of CVD Diamond Coated Drills in Drilling CFRP

2012 ◽  
Vol 499 ◽  
pp. 366-371 ◽  
Author(s):  
Jian Guo Zhang ◽  
Ben Wang ◽  
Fang Hong Sun ◽  
Hang Gao
Keyword(s):  
Thermal Conductivity ◽  
Wear Resistance ◽  
Diamond Films ◽  
Chemical Vapor ◽  
Cvd Diamond ◽  
Cutting Performance ◽  
Reinforced Plastics ◽  
Coated Tool ◽  
Hot Filament

Carbon fiber reinforced plastics (CFRP) is difficult to machine because of the extremely abrasive nature of the carbon fibers and its low thermal conductivity. CVD diamond films have many excellent properties such as wonderful wear resistance, high thermal conductivity and low friction coefficient, therefore depositing diamond films on the surface of drills is thought to be an effective way to elongate the lifetime of drills and improve the cutting performance. In this study, diamond films are deposited on the WC-Co drill using hot filament chemical vapor deposition (HFCVD) method. The results of characterization by the scanning electron microscope (SEM) and Raman spectrum indicate that the fabricated CVD diamond coated drill is covered with a layer of uniform and high-purity diamond films. The cutting performance of as-fabricated CVD diamond coated drill is evaluated in dry drilling CFRP, comparing with the uncoated WC-Co drill. The results demonstrate that the CVD diamond coated drill exhibits much stronger wear resistance. Its flank wear is about 50μm after drilling 30 holes, about one-third of that of WC-Co drill. Machining quality of the exit and internal wall of drilled holes shows better surface finish obtained by coated drill, which suggests that CVD diamond coated tool has great advantages in drilling CFRP.

Thermal conductivity of various glass-reinforced plastics at temperatures below 80 K

Cryogenics ◽  
1987 ◽  
Vol 27 (8) ◽  
pp. 429-432 ◽  
Author(s):  
Yu.P. Dmitrevsky ◽  
S.S. Kozub ◽  
U. Escher
Keyword(s):  
Thermal Conductivity ◽  
Reinforced Plastics
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