Towards functionally graded cellular microstructures

J.R. Corney, C. Torres-Sanchez

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

Many materials require functionally graded cellular microstructures whose porosity (i.e. ratio of the void to solid volume of a material) is engineered to meet specific requirements. Indeed numerous applications have demonstrated the engineering potential of porous materials (e.g. polymeric foams) in areas ranging from biomaterial science through to structural engineering. Although a huge variety of foams can be manufactured with homogenous porosity, for heterogeneous foams there are no generic processes for controlling the distribution of porosity throughout the resulting matrix. Motivated by the desire to create a flexible process for engineering heterogeneous foams, this paper reports how ultrasound, applied during some of the foaming stages of a polyurethane (PU) melt, affects both the cellular structure and distribution of the pore size. The experimental results allowed an empirical understanding of how the parameters of ultrasound exposure (i.e. frequency and acoustic pressure) influenced the volume and distribution of pores within the final polyurethane matrix: the data demonstrates that porosity (i.e. volume fraction) varies in direct proportion to the acoustic pressure magnitude of the ultrasound signal. The effects of ultrasound on porosity demonstrated by this work offer the prospect of a manufacturing process that can adjust the cellular geometry of foam and hence ensure that the resulting characteristics match the functional requirements.
Original languageEnglish
Title of host publicationSmart Materials, Adaptive Structures and Intelligent Systems
Pages45-53
Number of pages8
Volume1
Publication statusPublished - 2008

Publication series

NameASME Conference Proceedings
PublisherASME

Fingerprint

Foams
Porosity
Microstructure
Ultrasonics
Polyurethanes
Acoustics
Functionally graded materials
Structural design
Biomaterials
Pore size
Porous materials
Volume fraction
Geometry

Keywords

  • polymeric foam
  • graded porosity
  • sonication
  • manufacture

Cite this

Corney, J. R., & Torres-Sanchez, C. (2008). Towards functionally graded cellular microstructures. In Smart Materials, Adaptive Structures and Intelligent Systems (Vol. 1, pp. 45-53). (ASME Conference Proceedings).
Corney, J.R. ; Torres-Sanchez, C. / Towards functionally graded cellular microstructures. Smart Materials, Adaptive Structures and Intelligent Systems. Vol. 1 2008. pp. 45-53 (ASME Conference Proceedings).
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Corney, JR & Torres-Sanchez, C 2008, Towards functionally graded cellular microstructures. in Smart Materials, Adaptive Structures and Intelligent Systems. vol. 1, ASME Conference Proceedings, pp. 45-53.

Towards functionally graded cellular microstructures. / Corney, J.R.; Torres-Sanchez, C.

Smart Materials, Adaptive Structures and Intelligent Systems. Vol. 1 2008. p. 45-53 (ASME Conference Proceedings).

Research output: Chapter in Book/Report/Conference proceedingChapter

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Corney JR, Torres-Sanchez C. Towards functionally graded cellular microstructures. In Smart Materials, Adaptive Structures and Intelligent Systems. Vol. 1. 2008. p. 45-53. (ASME Conference Proceedings).