In-plane permeability measurement and analysis in liquid composite molding

1994 ◽  
Vol 15 (4) ◽  
pp. 278-288 ◽  
Author(s):  
T. James Wang ◽  
C. H. Wu ◽  
L. James Lee
Keyword(s):  
Liquid Composite Molding ◽  
Permeability Measurement ◽  
Composite Molding ◽  
Measurement And Analysis

In-Situ Measurement and Monitoring of Fiber Preform Permeability for Liquid Composite Molding

2000 ◽  
Author(s):  
Zhiyong Liang ◽  
Chuck Zhang ◽  
Ben Wang ◽  
Chiang Shih
Keyword(s):  
Gas Flow ◽  
Gas Permeability ◽  
Pressure Profile ◽  
Air Permeability ◽  
Experimental Results ◽  
Liquid Composite Molding ◽  
Permeability Measurement ◽  
Fiber Preform ◽  
Composite Molding

Abstract In a liquid composite molding (LCM) process such as resin transfer molding (RTM), quality control depends on an in-situ permeability profile of the fibrous preform taken just before resin injection. However, the conventional permeability measurement method, which uses liquid (oil or resin) as its working fluid, only measures the average preform permeability in an off-line mode. It cannot be used to create an in-situ permeability profile because of fiber pollution, and cannot be used to reveal local permeability variations of preform. This study develops a new permeability characterization method that uses gas flow and pressure profiles to measure preform permeability variation in a closed mold assembly. This method is based upon two research findings: (1) that the air permeability of a preform can be obtained through measuring the pressure profile of gas flow, and (2) that resin permeability is highly correlated with air permeability for the same fiber preform. In this paper, the validity of this method is discussed. Experimental results of gas permeability measurement with defective and defect-free preforms are presented, and quantitative models for correlation of gas permeability versus pressure profile and of gas permeability versus resin permeability are also provided. Finally, the efficacy of the proposed method is illustrated through experimental results.

Measurement of Transverse Permeability of Fabric Preforms Using Ultrasound Monitoring Technique in LCM Processes

2011 ◽  
Vol 311-313 ◽  
pp. 214-217 ◽  
Author(s):  
Jin Hua Jiang ◽  
Ze Xing Wang ◽  
Nan Liang Chen
Keyword(s):  
Transverse Direction ◽  
Process Analysis ◽  
Resin Flow ◽  
Liquid Composite Molding ◽  
Permeability Measurement ◽  
Ultrasound Monitoring ◽  
Monitoring Technique ◽  
Transverse Permeability ◽  
Composite Molding ◽  
Flow Through

Processes of the Liquid Composite Molding (LCM) are widely used in composites produced by impregnation of a dry preform with liquid resin. The resin flow through the preform is usually described by Darcy’s law and the permeability tensor must be obtained for filling process analysis and characterizing the ability of a porous material to be impregnated by a resin fluid. In generally, resin flow in the thickness direction can be neglected for thin parts, but the resin flow in the transverse direction is important for thicker parts. In this study, the transverse permeability measurement device using ultrasound method was developed, the transverse flowfront could be calculated, and global effective permeability and transverse were studied.

Simulation of Reactive Liquid Composite Molding

1998 ◽  
Vol 13 (4) ◽  
pp. 389-397 ◽  
Author(s):  
C.-H. Wu ◽  
H.-T. Chiu ◽  
L. J. Lee ◽  
S. Nakamura
Keyword(s):  
Liquid Composite Molding ◽  
Composite Molding ◽  
Reactive Liquid

Modélisation viscoélastique des renforts fibreux dans les procédés de type Liquid Composite Molding (LCM)

2014 ◽  
Vol 24 (3) ◽  
pp. 367-381
Author(s):  
Mack Boris Nziengui ◽  
Hind Abdellaoui ◽  
Jamal Echaabi ◽  
Mohamed Hattabi
Keyword(s):  
Liquid Composite Molding ◽  
Composite Molding

scholarly journals A Conceptional Approach of Resin-Transfer-Molding to Rosin-Sourced Epoxy Matrix Green Composites

Aerospace ◽  
2020 ◽  
Vol 8 (1) ◽  
pp. 5
Author(s):  
Sicong Yu ◽  
Xufeng Zhang ◽  
Xiaoling Liu ◽  
Chris Rudd ◽  
Xiaosu Yi
Keyword(s):  
Composite Laminates ◽  
Resin Transfer Molding ◽  
High Viscosity ◽  
Ramie Fiber ◽  
Liquid Composite Molding ◽  
Curing Agent ◽  
Molding Process ◽  
Transfer Molding ◽  
Low Viscosity ◽  
Composite Molding

In this concept-proof study, a preform-based RTM (Resin Transfer Molding) process is presented that is characterized by first pre-loading the solid curing agent onto the preform, and then injecting the liquid nonreactive resin with an intrinsically low viscosity into the mold to infiltrate and wet the pre-loaded preform. The separation of resin and hardener helped to process inherently high viscosity resins in a convenient way. Rosin-sourced, anhydrite-cured epoxies that would normally be regarded as unsuited to liquid composite molding, were thus processed. Rheological tests revealed that by separating the anhydrite curing agent from a formulated RTM resin system, the remaining epoxy liquid had its flowtime extended. C-scan and glass transition temperature tests showed that the preform pre-loaded with anhydrite was fully infiltrated and wetted by the liquid epoxy, and the two components were diffused and dissolved with each other, and finally, well reacted and cured. Composite laminates made via this approach exhibited roughly comparable quality and mechanical properties with prepreg controls via autoclave or compression molding, respectively. These findings were verified for both carbon and ramie fiber composites.

Fiber optic flow and cure sensing for liquid composite molding

2001 ◽  
Vol 35 (2) ◽  
pp. 91-104 ◽  
Author(s):  
Joy P. Dunkers ◽  
Joseph L. Lenhart ◽  
Sylvia R. Kueh ◽  
John H. van Zanten ◽  
Suresh G. Advani ◽  
...  
Keyword(s):  
Optic Flow ◽  
Fiber Optic ◽  
Liquid Composite Molding ◽  
Composite Molding
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