Numerical Investigation of Hot Embossing Filling Characteristics

2007 ◽  
Vol 22 (3) ◽  
pp. 266-275 ◽  
Author(s):  
T. G. Kang ◽  
T. H. Kwon
Keyword(s):  
Numerical Investigation ◽  
Hot Embossing ◽  
Filling Characteristics

A Study on Formability of a Polyimide Film by Using Visco-Elasticity Measurement and Hot-Embossing Tests

2007 ◽  
Vol 561-565 ◽  
pp. 1189-1192
Author(s):  
Sung Won Youn ◽  
Kazumi Suda ◽  
Masaharu Takahashi ◽  
Ryutaro Maeda
Keyword(s):  
Shear Modulus ◽  
Shear Viscosity ◽  
Strong Dependence ◽  
Polyimide Film ◽  
Hot Embossing ◽  
Dynamic Mechanical Properties ◽  
Surface Appearance ◽  
Different Temperatures ◽  
Elasticity Measurement ◽  
Filling Characteristics

This study explores the dynamic mechanical properties (e.g., storage shear modulus, loss tangent and shear viscosity) and formability of a polyimide film by visco-elasticity measurement and hot-embossing tests. The variations of storage shear modulus, tangent delta and the shear viscosity were measured as a function of the temperature for two frequencies. As a polyimide goes through its glass transition, it exhibits dramatic decreases in shear modulus and viscosity as well as the peak of tangent delta, and continues to show strong dependence on frequency and temperature. Moreover, the filling characteristics (e.g., surface appearance, replicated depth and surface roughness) of polyimide were investigated by hot-embossing tests at different temperatures using a mold with an aspect ratio of 2.5:1.

Numerical Investigation of Discharge Current Path in a Hydrogen MPD Thruster

2016 ◽  
Vol 136 (3) ◽  
pp. 141-146 ◽  
Author(s):  
Akira Kawasaki ◽  
Kenichi Kubota ◽  
Ikkoh Funaki ◽  
Yoshihiro Okuno
Keyword(s):  
Numerical Investigation ◽  
Discharge Current ◽  
Current Path
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