Implementation Of A Viscoelastic Material Model To Predict The Compaction Response Of Dry Carbon Fiber Preforms

2021 ◽  
pp. 106718
Author(s):  
Bublitz Dennis ◽  
Colin David ◽  
Drechsler Klaus
Keyword(s):  
Carbon Fiber ◽  
Viscoelastic Material ◽  
Material Model ◽  
Fiber Preforms

A Viscoelastic Correspondence Principle for Plane Membranes Subjected to Lateral Pressure

1983 ◽  
Vol 50 (4a) ◽  
pp. 740-742 ◽  
Author(s):  
B. Stora˚kers
Keyword(s):  
Time Dependence ◽  
Viscoelastic Material ◽  
Lateral Pressure ◽  
Correspondence Principle ◽  
Material Model ◽  
Material Behavior ◽  
Linear Elastic Material ◽  
First Order ◽  
Linear Elastic ◽  
Consistent Approximation

The classical Fo¨ppl equations, governing the deflection of plane membranes, constitute the first-order consistent approximation in the case of linear elastic material behavior. It is shown that despite the static and kinematic nonlinearities present, for arbitrary load histories a correspondence principle for viscoelastic material behavior exists if all relevant relaxation moduli are of uniform time dependence. Application of the principle is illustrated by means of a popular material model.

Automatic Handling of Carbon Fiber Preforms for CFRP Parts in Aerospace

2012 ◽  
Author(s):  
Hilmar Apmann ◽  
Alexander Hemmen ◽  
Manuel Herkt
Keyword(s):  
Carbon Fiber ◽  
Fiber Preforms

Effect of Impurity and Gas Nature on Microstructure of SiC Microtubes in Double Step Reaction Process

2006 ◽  
Vol 510-511 ◽  
pp. 302-305
Author(s):  
Sang Won Myoung ◽  
Jin Ho Kang ◽  
Seong Hwan Park ◽  
Seoung Soo Lee ◽  
Dong Won Joo ◽  
...  
Keyword(s):  
Carbon Fiber ◽  
Surface Area ◽  
Carbon Fibers ◽  
Hydrogen Gas ◽  
Reaction Process ◽  
Qualitative Properties ◽  
Double Step ◽  
Small Surface ◽  
Membrane Type ◽  
Fiber Preforms

A novel process in the synthesis of SiC microtubes is proposed, based on modified CVD process. This process was adopted to siliconize the carbon fibers that perform with relatively small surface area, either partially or completely, into the SiC microtubes with large surface area. An oxidic vapor generated from a metal reacts with a carbon solid preform, which leads to a carbide possessing with a unique morphology. The carbon fiber preforms have been unidirectionally arranged into alumina tube, and then a solid-vapor reaction between carbon fiber preforms and SiO vapor originated from the mixture powder pack of Si and SiO2 has been carried out in restoration atmosphere (argon gas/hydrogen gas = 80/20) at 1450°C. The synthesized SiC.C composites were re-sintered with the modified mixture powder pack of Si, SiO2, Al, and Al2O3 at the same condition, in which amounts of Al and Al2O3 employed as a impurity have been controlled under 1 wt% with different mole ratios (Al2O3 : Al = 1:1, 2:1, 3:1). Two kinds of SiO and AlO vapors are generated in the second step reaction process, which react with carbon residuals. The quantitative and qualitative properties of the SiC micorotubes were analyzed by using TGA, SEM, and XRD. The inner morphology of the SiC micorotubes is dependent on the impurity concentration and the gas nature, showing the grains grown with membrane type in the second reaction process because of the impurity.

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