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Fracture toughening mechanisms in na...

University of Florida.

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Fracture toughening mechanisms in nanoparticle and micro-particle reinforced epoxy systems using multi-scale analysis.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Fracture toughening mechanisms in nanoparticle and micro-particle reinforced epoxy systems using multi-scale analysis./
作者:	Boesl, Benjamin.
面頁冊數:	85 p.
附註:	Advisers: Bhavani Sankar; W. Gregory Sawyer.
Contained By:	Dissertation Abstracts International70-07B.
標題:	Engineering, Aerospace. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3367407
ISBN:	9781109274714

Fracture toughening mechanisms in nanoparticle and micro-particle reinforced epoxy systems using multi-scale analysis.
Boesl, Benjamin.

Fracture toughening mechanisms in nanoparticle and micro-particle reinforced epoxy systems using multi-scale analysis. - 85 p.

Advisers: Bhavani Sankar; W. Gregory Sawyer.

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

Fracture toughness results from multi-scale experimentation and modeling of a polymer system reinforced with ZnO particles of two nominal diameters (53 nanometers and 75 microns) are presented within this work. The composites were fabricated using an orbital shear-mixing device. Fracture toughness measurements were completed using a four point bend apparatus following ASTM standard E1820, resulting in an increase of 80 percent in critical stress intensity factor for epoxy filled with 4 volume percent nanoparticles. Studies using a focused ion beam were conducted to investigate the toughening mechanisms of particle reinforcement at the micro-scale. Cantilever beams were created over two different length scales (approximately 1 mm and 10 microns) and loaded using an Omniprobe device in-situ in the focused ion beam. Using this method, both the nanoparticles and the crack were imaged simultaneously and the results were compared with common assumptions regarding crack propagation within particulate composites. Experimental results were compared to three hypotheses using both experimental results and modeling techniques in an attempt to explain the increase in toughness that can be observed in a typical nanocomposite system. Results showed strong correlations to mechanisms that reduce the apparent stress intensity factor in the crack tip region thus preventing unstable crack growth.

ISBN: 9781109274714Subjects--Topical Terms:

1018395
Engineering, Aerospace.

Fracture toughening mechanisms in nanoparticle and micro-particle reinforced epoxy systems using multi-scale analysis.
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520 $a Fracture toughness results from multi-scale experimentation and modeling of a polymer system reinforced with ZnO particles of two nominal diameters (53 nanometers and 75 microns) are presented within this work. The composites were fabricated using an orbital shear-mixing device. Fracture toughness measurements were completed using a four point bend apparatus following ASTM standard E1820, resulting in an increase of 80 percent in critical stress intensity factor for epoxy filled with 4 volume percent nanoparticles. Studies using a focused ion beam were conducted to investigate the toughening mechanisms of particle reinforcement at the micro-scale. Cantilever beams were created over two different length scales (approximately 1 mm and 10 microns) and loaded using an Omniprobe device in-situ in the focused ion beam. Using this method, both the nanoparticles and the crack were imaged simultaneously and the results were compared with common assumptions regarding crack propagation within particulate composites. Experimental results were compared to three hypotheses using both experimental results and modeling techniques in an attempt to explain the increase in toughness that can be observed in a typical nanocomposite system. Results showed strong correlations to mechanisms that reduce the apparent stress intensity factor in the crack tip region thus preventing unstable crack growth.
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