Cellular Microstructures
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20-10-2010, 04:41 PM

.ppt   Towards Functionally Graded Cellular Microstructures.ppt (Size: 3.52 MB / Downloads: 65)
Toward Functionally Graded Cellular Microstructures

Presented by:
M.Tech-Machine Design (1st Year)
Karunya Institute of Technology.

Guided by:
Mr. Prancis D’Souza
Mechanical Department,
IIT Kanpur.


Why towards this topic?

The design of multifunctional materials offers great potential for numerous applications in areas ranging from biomaterial science to structural engineering.

- What are functionally graded cellular microstructures?

• Functionally graded microstructures (e.g., polymeric foams) are those whose porosity (i.e., ratio of the void to the solid volume of a material) is engineered to meet specific requirements such as a superior mechanical, thermal, and acoustic behavior.

- What does this paper describe?

• This paper describes work to develop an innovative and flexible process for manufacturing engineered cellular structures.

- What is the technology used?

• Ultrasound is applied during specific foaming stages of a polymeric (polyurethane) melt, and this affected both the cellular architecture and distribution of the pore size, resulting in a controlled distribution that can be designed for specific purposes, once the polymeric foam solidified.

- The result of this paper.

• The experimental results demonstrate that porosity (i.e.,volume fraction) varies in direct proportion to the acoustic pressure magnitude of the ultrasonic signal.


• The effects of ultrasound on porosity demonstrated by this work offer the prospect of a flexible manufacturing process that can control and adjust the cellular geometry of foam.
• Further work needs to be done in order to investigate if other polymers’ “sonication window” allows ultrasound to produce a long-lasting effect once the solid structure is set, and if ultrasonic irradiation can also be used as a porosity-tailoring agent when polymers are manufactured under different conditions of pressure, temperature, etc.


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