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Permeability characterization and qu...

Opperer, Jeremy G.

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Permeability characterization and quality control of reinforcement in resin transfer molding by the gas flow method.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Permeability characterization and quality control of reinforcement in resin transfer molding by the gas flow method./
Author:	Opperer, Jeremy G.
Description:	198 p.
Notes:	Source: Dissertation Abstracts International, Volume: 65-05, Section: B, page: 2592.
Contained By:	Dissertation Abstracts International65-05B.
Subject:	Engineering, Mechanical. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3132576

Permeability characterization and quality control of reinforcement in resin transfer molding by the gas flow method.
Opperer, Jeremy G.

Permeability characterization and quality control of reinforcement in resin transfer molding by the gas flow method. - 198 p.

Source: Dissertation Abstracts International, Volume: 65-05, Section: B, page: 2592.

Thesis (Ph.D.)--Northwestern University, 2004.

Resin transfer molding (RTM) requires the permeation of a viscous fluid through a mold enclosed preform. The in-plane flow pattern, rate of flow, and gate pressures are essential to the design of an efficient RTM process. This information can be calculated using Darcy's Law, which is dependent on the constituent material properties, fluid viscosity and preform permeability. Established methods and databases are available to determine viscosity, however, there are no established procedures for quantifying RTM preform permeability.Subjects--Topical Terms:

783786
Engineering, Mechanical.

Permeability characterization and quality control of reinforcement in resin transfer molding by the gas flow method.
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035 $a (UnM)AAI3132576
035 $a AAI3132576
040 $a UnM $c UnM
100 1 $a Opperer, Jeremy G. $3 1952365
245 1 0 $a Permeability characterization and quality control of reinforcement in resin transfer molding by the gas flow method.
300 $a 198 p.
500 $a Source: Dissertation Abstracts International, Volume: 65-05, Section: B, page: 2592.
500 $a Adviser: Isaac. M. Daniel.
502 $a Thesis (Ph.D.)--Northwestern University, 2004.
520 $a Resin transfer molding (RTM) requires the permeation of a viscous fluid through a mold enclosed preform. The in-plane flow pattern, rate of flow, and gate pressures are essential to the design of an efficient RTM process. This information can be calculated using Darcy's Law, which is dependent on the constituent material properties, fluid viscosity and preform permeability. Established methods and databases are available to determine viscosity, however, there are no established procedures for quantifying RTM preform permeability.
520 $a This work discusses previous techniques for permeability estimation using liquid flow methods. Problems associated with such approaches are addressed and experienced firsthand, through laboratory experimentation. A gas flow method (GFM) for permeability measurement is introduced. It is proven to be robust and facilitates the rapid acquisition of permeability data without contaminating the material while it is in the mold. The feasibility of this method is demonstrated using a mold with multiple ports for gas injection and pressure measurement, and yielded consistent and reliable results.
520 $a The GFM is applied to determine the quality of fibrous preforms in an RTM mold prior to resin injection. Defects resulting from preform misplacement, accidental inclusions, material preparation, etc., are quantified. Unintentional permeability variations, due to such defects, can result in defective part production and excessive part scrapping. Pressure profiles generated during steady-state gas flow are affected by such variations. To determine the anomaly type, location, and severity, a multivariate statistical approach called discriminant analysis (DA) is applied to compare measured quantities from a test preform with quantities obtained from known groups. The tested preform is then classified into a defect free group or any one of several groups associated with specific types of defects, such as inclusions, shear, and race tracking. Application of this process has been accomplished on an unmodified industrial mold used to fabricate composite curved I-Beam stiffeners. The GFM for RTM preform quality control can be used to optimize industrial RTM processes with minimal inconvenience to mold operators.
590 $a School code: 0163.
650 4 $a Engineering, Mechanical. $3 783786
650 4 $a Engineering, Materials Science. $3 1017759
650 4 $a Textile Technology. $3 1020710
690 $a 0548
690 $a 0794
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710 2 0 $a Northwestern University. $3 1018161
773 0 $t Dissertation Abstracts International $g 65-05B.
790 1 0 $a Daniel, Isaac. M., $e advisor
790 $a 0163
791 $a Ph.D.
792 $a 2004
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3132576