Flow induced microstructure in composite materials

Hemant K. Kini, YoChan Kim, Chinh T. Nguyen, André Bénard, Charles A. Petty

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Flow-induced alignment of the dispersed phase of a composite material during processing determines the local microstructure and, thereby, the mechanical and transport properties of the final product. Model predictions of the microstructure are often based on low-order statistical properties of Smoluchowski's equation for the orientation distribution function. A second-order moment equation relates the orientation dyad to the local flow field and the orientation tetrad. Unfortunately, this approach for predicting the microstructure has been limited by the absence of a practical and accurate closure model for the orientation tetrad. This research examines flow-induced alignment of fiber suspensions and liquid crystalline polymers by using a closure approximation that retains the six-fold symmetry and six-fold projection properties of the exact orientation tetrad. In the absence of deformation, the theory predicts multiple equilibrium states. In the presence of a homogeneous shear flow, the orientation director shows periodic behavior at relatively high concentration of the dispersed phase.

LanguageEnglish (US)
Title of host publicationTechnical Paper - Society of Manufacturing Engineers
Pages183-192
Number of pages10
StatePublished - 2004
EventICCM-14 - San Diego, CA, United States
Duration: Jul 14 2003Jul 18 2003

Other

OtherICCM-14
CountryUnited States
CitySan Diego, CA
Period7/14/037/18/03

Profile

Microstructure
Composite materials
Liquid crystal polymers
Shear flow
Transport properties
Distribution functions
Flow fields
Mechanical properties
Fibers
Processing

Keywords

  • Closure approximation
  • Equilibrium states
  • Flow induced alignment
  • Liquid crystalline polymers
  • Orientation statistics
  • Simple shear

ASJC Scopus subject areas

  • Engineering(all)

Cite this

Kini, H. K., Kim, Y., Nguyen, C. T., Bénard, A., & Petty, C. A. (2004). Flow induced microstructure in composite materials. In Technical Paper - Society of Manufacturing Engineers (pp. 183-192)

Flow induced microstructure in composite materials. / Kini, Hemant K.; Kim, YoChan; Nguyen, Chinh T.; Bénard, André; Petty, Charles A.

Technical Paper - Society of Manufacturing Engineers. 2004. p. 183-192.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Kini, HK, Kim, Y, Nguyen, CT, Bénard, A & Petty, CA 2004, Flow induced microstructure in composite materials. in Technical Paper - Society of Manufacturing Engineers. pp. 183-192, ICCM-14, San Diego, CA, United States, 7/14/03.
Kini HK, Kim Y, Nguyen CT, Bénard A, Petty CA. Flow induced microstructure in composite materials. In Technical Paper - Society of Manufacturing Engineers. 2004. p. 183-192.
Kini, Hemant K. ; Kim, YoChan ; Nguyen, Chinh T. ; Bénard, André ; Petty, Charles A./ Flow induced microstructure in composite materials. Technical Paper - Society of Manufacturing Engineers. 2004. pp. 183-192
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