國立虎尾科技大學 |

Pressure Chamber Experiments to Determine Triaxial Material Properties of Polymer Foams.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Pressure Chamber Experiments to Determine Triaxial Material Properties of Polymer Foams./
Author:	Zhong, Chong.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2019,
Description:	174 p.
Notes:	Source: Dissertations Abstracts International, Volume: 81-02, Section: B.
Contained By:	Dissertations Abstracts International81-02B.
Subject:	Mechanical engineering. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=27534803
ISBN:	9781085657792

Pressure Chamber Experiments to Determine Triaxial Material Properties of Polymer Foams.
Zhong, Chong.

Pressure Chamber Experiments to Determine Triaxial Material Properties of Polymer Foams. - Ann Arbor : ProQuest Dissertations & Theses, 2019 - 174 p.

Source: Dissertations Abstracts International, Volume: 81-02, Section: B.

Thesis (Ph.D.)--The University of Akron, 2019.

This item must not be sold to any third party vendors.

The objective of this research was to investigate the mechanical behavior of Divinycell PVC H100 foam under cyclic triaxial loading in order to address plastic deformation and hysteresis of sandwich panels with polymer foams cores. Composite sandwich structures with polymer foam cores has widespread applications because of their high stiffness, strong strength and low weight. For the application in navy ships, sandwich panels with more ductile foam core can offer better blast resistance than panels with stiffer and stronger foams because of the associated energy dissipation due to core crushing.A pressure vessel experiment was developed to determine the multiaxial, elastic-plastic and hysteresis behavior of Divinycell PVC H100 foam. Arcan butterfly and tensile dogbone specimens were encased in the air chamber of a cylindrical pressure vessel, which was designed to work within an MTS servo-hydraulic machine. Digital Image Correlation was used to measure strains in the specimen during the experiments. Material tests under cyclic loading of the foam under uniaxial compression and tension, shear, biaxial compression and shear, triaxial compression, triaxial compression-tension and triaxial compression and shear, were performed in both out-of-plane and in-plane directions of the foam. The foam, which was transversely isotropic, exhibited elastic-plastic response followed by damage and viscoelastic hysteresis. Compared with the Hill, Hoffman and TDFC (Tagarielli-Deshpande-Fleck-Chen) failure criteria, the Tsai-Wu quadratic failure criterion, with its 12 material constants, was the best to predict the correct yield behavior under triaxial stress states. The foam produced hysteresis due to viscoelasticity when it underwent the unloading and reloading cycles. A material model was proposed to describe viscoelastic hysteresis, damage and plasticity of PVC H100 foam, which would be used for the development of three-dimensional model to predict the underwater blast performance of composite sandwich structures.

ISBN: 9781085657792Subjects--Topical Terms:

557493
Mechanical engineering.
Subjects--Index Terms:

Polymer foam

Pressure Chamber Experiments to Determine Triaxial Material Properties of Polymer Foams.
LDR:03201nam a2200361 4500 001 1121830
005 20240624103645.5
006 m o d
007 cr#unu||||||||
008 240823s2019 ||||||||||||||||| ||eng d
020 $a 9781085657792
035 $a (MiAaPQ)AAI27534803
035 $a (MiAaPQ)OhioLINKakron1556265641540063
035 $a AAI27534803
040 $a MiAaPQ $c MiAaPQ
100 1 $a Zhong, Chong. $3 1437621
245 1 0 $a Pressure Chamber Experiments to Determine Triaxial Material Properties of Polymer Foams.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2019
300 $a 174 p.
500 $a Source: Dissertations Abstracts International, Volume: 81-02, Section: B.
500 $a Advisor: Fatt, Michelle Hoo.
502 $a Thesis (Ph.D.)--The University of Akron, 2019.
506 $a This item must not be sold to any third party vendors.
520 $a The objective of this research was to investigate the mechanical behavior of Divinycell PVC H100 foam under cyclic triaxial loading in order to address plastic deformation and hysteresis of sandwich panels with polymer foams cores. Composite sandwich structures with polymer foam cores has widespread applications because of their high stiffness, strong strength and low weight. For the application in navy ships, sandwich panels with more ductile foam core can offer better blast resistance than panels with stiffer and stronger foams because of the associated energy dissipation due to core crushing.A pressure vessel experiment was developed to determine the multiaxial, elastic-plastic and hysteresis behavior of Divinycell PVC H100 foam. Arcan butterfly and tensile dogbone specimens were encased in the air chamber of a cylindrical pressure vessel, which was designed to work within an MTS servo-hydraulic machine. Digital Image Correlation was used to measure strains in the specimen during the experiments. Material tests under cyclic loading of the foam under uniaxial compression and tension, shear, biaxial compression and shear, triaxial compression, triaxial compression-tension and triaxial compression and shear, were performed in both out-of-plane and in-plane directions of the foam. The foam, which was transversely isotropic, exhibited elastic-plastic response followed by damage and viscoelastic hysteresis. Compared with the Hill, Hoffman and TDFC (Tagarielli-Deshpande-Fleck-Chen) failure criteria, the Tsai-Wu quadratic failure criterion, with its 12 material constants, was the best to predict the correct yield behavior under triaxial stress states. The foam produced hysteresis due to viscoelasticity when it underwent the unloading and reloading cycles. A material model was proposed to describe viscoelastic hysteresis, damage and plasticity of PVC H100 foam, which would be used for the development of three-dimensional model to predict the underwater blast performance of composite sandwich structures.
590 $a School code: 0003.
650 4 $a Mechanical engineering. $3 557493
653 $a Polymer foam
653 $a 3d-dic
653 $a Triaxial loading
690 $a 0548
710 2 $a The University of Akron. $b Mechanical Engineering. $3 1180233
773 0 $t Dissertations Abstracts International $g 81-02B.
790 $a 0003
791 $a Ph.D.
792 $a 2019
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=27534803