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A novel manufacturing process for li...

Nadella, Venkata Krishna.

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A novel manufacturing process for lightweight and energy efficient microcellular panels for load bearing applications.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	A novel manufacturing process for lightweight and energy efficient microcellular panels for load bearing applications./
作者:	Nadella, Venkata Krishna.
面頁冊數:	243 p.
附註:	Source: Dissertation Abstracts International, Volume: 70-04, Section: B, page: 2535.
Contained By:	Dissertation Abstracts International70-04B.
標題:	Mechanical engineering. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3356648
ISBN:	9781109125870

A novel manufacturing process for lightweight and energy efficient microcellular panels for load bearing applications.
Nadella, Venkata Krishna.

A novel manufacturing process for lightweight and energy efficient microcellular panels for load bearing applications. - 243 p.

Source: Dissertation Abstracts International, Volume: 70-04, Section: B, page: 2535.

Thesis (Ph.D.)--University of Washington, 2009.

This item is not available from ProQuest Dissertations & Theses.

A novel manufacturing process, termed Constrained Foaming, has been developed for producing lightweight, solid-state microcellular thermoplastic panels. The goal of this research is to reduce density and material usage in load-bearing plastic panel systems with minimal loss of mechanical properties. Feasibility was established on various thermoplastics demonstrating the broad applicability for this process. The acrylonitrile butadiene styrene-carbon dioxide (ABS-CO 2) system was chosen for further development of both the process and the lightweight microcellular panels.

ISBN: 9781109125870Subjects--Topical Terms:

649730
Mechanical engineering.

A novel manufacturing process for lightweight and energy efficient microcellular panels for load bearing applications.
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245 1 2 $a A novel manufacturing process for lightweight and energy efficient microcellular panels for load bearing applications.
300 $a 243 p.
500 $a Source: Dissertation Abstracts International, Volume: 70-04, Section: B, page: 2535.
500 $a Advisers: Vipin Kumar; John Kramlich.
502 $a Thesis (Ph.D.)--University of Washington, 2009.
506 $a This item is not available from ProQuest Dissertations & Theses.
520 $a A novel manufacturing process, termed Constrained Foaming, has been developed for producing lightweight, solid-state microcellular thermoplastic panels. The goal of this research is to reduce density and material usage in load-bearing plastic panel systems with minimal loss of mechanical properties. Feasibility was established on various thermoplastics demonstrating the broad applicability for this process. The acrylonitrile butadiene styrene-carbon dioxide (ABS-CO 2) system was chosen for further development of both the process and the lightweight microcellular panels.
520 $a The steady-state process for ABS-CO2 was characterized in detail using design of experiments (DOE) methodology. Density reductions in the 5%-90% range were achieved with varying microstructures over a broad processing range. Microcellular panels in the 4.5-12.5 mm thickness range were produced. Tensile and flexural properties of microcellular ABS cores are presented for density reductions in the range of 20%-80% and were found to follow established models for cellular materials.
520 $a Polymer-gas interactions in ABS-CO2 were studied for the development of a process model. The diffusivity of CO2 gas into and out of ABS was found to be dependent on the concentration of dissolved CO2 already present in ABS. Two-parameter exponential models that accurately describe the concentration dependent diffusion in the ABS-CO2 system were derived and experimentally verified for both the sorption and desorption processes. The diffusivity-concentration relationship for sorption was found to be different than the relationship for desorption.
520 $a Time required for saturating thick sheets of ABS was identified as a potential bottleneck for commercialization of the constrained foaming process. This issue was addressed by using the phenomenon of retrograde vitrification exhibited by ABS-CO2 according to which at temperatures close to 0°C the diffusivity of CO2 in ABS is greatly enhanced. The feasibility of using this phenomenon to reduce processing time for microcellular ABS panels was established and a productivity improvement of 2.5 times was achieved.
520 $a A semi-empirical process model capable of predicting cross-sectional density variation and average density in microcellular ABS panels was developed using DOE based regression model and one-dimensional gas diffusion theory. The density profile predictions were found to follow expected trends and the predicted mean density is within 10% of experimental results.
590 $a School code: 0250.
650 4 $a Mechanical engineering. $3 649730
650 4 $a Plastics. $3 649803
650 4 $a Materials science. $3 543314
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710 2 $a University of Washington. $3 545923
773 0 $t Dissertation Abstracts International $g 70-04B.
790 $a 0250
791 $a Ph.D.
792 $a 2009
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3356648