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Mechanical behavior of open cell alu...

Zhou, Jikou.

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Mechanical behavior of open cell aluminum foams.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Mechanical behavior of open cell aluminum foams./
Author:	Zhou, Jikou.
Description:	202 p.
Notes:	Source: Dissertation Abstracts International, Volume: 65-01, Section: B, page: 0401.
Contained By:	Dissertation Abstracts International65-01B.
Subject:	Engineering, Materials Science. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3120478
ISBN:	0496678442

Mechanical behavior of open cell aluminum foams.
Zhou, Jikou.

Mechanical behavior of open cell aluminum foams. - 202 p.

Source: Dissertation Abstracts International, Volume: 65-01, Section: B, page: 0401.

Thesis (Ph.D.)--Princeton University, 2004.

Open cell metallic foams are relatively new materials with increasingly applications due to their attractive combinations of physical, chemical, mechanical and optical properties. Since plastic deformation in the struts involves dislocation motion, dislocation slip bands are used to track the initiation/propagation and locations of plastic deformation in individual struts. We find that the onset of plastic deformation in struts is far beyond the observable strut/cell shape changes, and both plastic bending and buckling are strut deformation modes.

ISBN: 0496678442Subjects--Topical Terms:

1017759
Engineering, Materials Science.

Mechanical behavior of open cell aluminum foams.
LDR:03299nmm 2200337 4500 001 1847513
005 20051108095419.5
008 130614s2004 eng d
020 $a 0496678442
035 $a (UnM)AAI3120478
035 $a AAI3120478
040 $a UnM $c UnM
100 1 $a Zhou, Jikou. $3 1935555
245 1 0 $a Mechanical behavior of open cell aluminum foams.
300 $a 202 p.
500 $a Source: Dissertation Abstracts International, Volume: 65-01, Section: B, page: 0401.
500 $a Adviser: W. O. Soboyejo.
502 $a Thesis (Ph.D.)--Princeton University, 2004.
520 $a Open cell metallic foams are relatively new materials with increasingly applications due to their attractive combinations of physical, chemical, mechanical and optical properties. Since plastic deformation in the struts involves dislocation motion, dislocation slip bands are used to track the initiation/propagation and locations of plastic deformation in individual struts. We find that the onset of plastic deformation in struts is far beyond the observable strut/cell shape changes, and both plastic bending and buckling are strut deformation modes.
520 $a To measure the strut mechanical properties, an existing micro-scale tensile tester was updated to test the individual struts extracted from foams using electro-discharged machining. The micro-tensile testing results show that the foam struts are typically more ductile and one time stronger than the corresponding fully dense alloy.
520 $a To integrate the measured strut and foam properties, a four-strut structure unit is identified as a structural representative of the open cell foam structure. Based on the observed strut deformation modes, mechanics analysis is performed on the structure unit to predict the foam stiffness and strength. The predictions are in good agreement with the measured data, suggesting the significance of the studies on the foam strut properties and deformation. This model also predicts the bounds of the foam strengths.
520 $a Under cyclic compression, foams fail due to damage accumulation in individual struts, in which surface cracks initiate and grow. At low stress levels, surface cracks are formed in multiple struts that are distributed across the foam block. This results in an abrupt strain jump due to the crush of foam block, upon foam failure.
520 $a To meet applications requirements, open cell aluminum foams are usually annealed or strengthened. The studies are carried out in the foams in the as-fabricated (F), annealed (O) and T6-strengthed (T6) conditions. We find that annealing and T6 strengthening significantly affect the strut microstructure, the stress-strain behavior, the foam strength, and the macro-scale deformation of the foams under monotonic compression. The macro-scale deformation is studied using a combination of in situ imaging and surface strain mapping technique. This reveals the importance of localization in the propagation across the foam structure.
590 $a School code: 0181.
650 4 $a Engineering, Materials Science. $3 1017759
650 4 $a Engineering, Mechanical. $3 783786
650 4 $a Engineering, Metallurgy. $3 1023648
690 $a 0794
690 $a 0548
690 $a 0743
710 2 0 $a Princeton University. $3 645579
773 0 $t Dissertation Abstracts International $g 65-01B.
790 1 0 $a Soboyejo, W. O., $e advisor
790 $a 0181
791 $a Ph.D.
792 $a 2004
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3120478