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An elasto-viscoplastic constitutive ...

Mittal, Bhavishya.

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An elasto-viscoplastic constitutive formulation for dry powder compression analysis using finite elements.

Record Type:	Electronic resources : Monograph/item
Title/Author:	An elasto-viscoplastic constitutive formulation for dry powder compression analysis using finite elements./
Author:	Mittal, Bhavishya.
Description:	364 p.
Notes:	Source: Dissertation Abstracts International, Volume: 64-07, Section: B, page: 3473.
Contained By:	Dissertation Abstracts International64-07B.
Subject:	Engineering, Materials Science. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3097019

An elasto-viscoplastic constitutive formulation for dry powder compression analysis using finite elements.
Mittal, Bhavishya.

An elasto-viscoplastic constitutive formulation for dry powder compression analysis using finite elements. - 364 p.

Source: Dissertation Abstracts International, Volume: 64-07, Section: B, page: 3473.

Thesis (Ph.D.)--The Pennsylvania State University, 2003.

The aim of this research was to measure, analyze, model, and predict the rate-dependent mechanical behavior of dry powders undergoing compression in a die. Mechanical properties of two ceramic powders (MZF and alumina) were studied up to 14 MPa using a medium pressure flexible boundary cubical triaxial tester (CTT). The powders were subjected to undrained tests along two stress paths and three compression rates of 0.62, 6.21, and 20.7 MPa/minute. Based on test results from compression and shear stress paths, a new elasto-viscoplastic constitutive model (PSU-EVP) was developed for studying the dry powder compression process. The PSU-EVP model was formulated using the critical state theory, the modified Cam-clay model, and the Adachi and Oka model as the basis. Unlike the modified Cam-clay model, the PSU-EVP model explicitly accounts for the work done in the volumetric compression of pore air or gas during dry powder compression. This key feature of the PSU-EVP model helps in isolating the effect of entrapped pore air (or gas) on the mechanical properties of powders.Subjects--Topical Terms:

1017759
Engineering, Materials Science.

An elasto-viscoplastic constitutive formulation for dry powder compression analysis using finite elements.
LDR:03152nmm 2200277 4500 001 1865283
005 20041217071841.5
008 130614s2003 eng d
035 $a (UnM)AAI3097019
035 $a AAI3097019
040 $a UnM $c UnM
100 1 $a Mittal, Bhavishya. $3 1952736
245 1 3 $a An elasto-viscoplastic constitutive formulation for dry powder compression analysis using finite elements.
300 $a 364 p.
500 $a Source: Dissertation Abstracts International, Volume: 64-07, Section: B, page: 3473.
500 $a Adviser: V. M. Puri.
502 $a Thesis (Ph.D.)--The Pennsylvania State University, 2003.
520 $a The aim of this research was to measure, analyze, model, and predict the rate-dependent mechanical behavior of dry powders undergoing compression in a die. Mechanical properties of two ceramic powders (MZF and alumina) were studied up to 14 MPa using a medium pressure flexible boundary cubical triaxial tester (CTT). The powders were subjected to undrained tests along two stress paths and three compression rates of 0.62, 6.21, and 20.7 MPa/minute. Based on test results from compression and shear stress paths, a new elasto-viscoplastic constitutive model (PSU-EVP) was developed for studying the dry powder compression process. The PSU-EVP model was formulated using the critical state theory, the modified Cam-clay model, and the Adachi and Oka model as the basis. Unlike the modified Cam-clay model, the PSU-EVP model explicitly accounts for the work done in the volumetric compression of pore air or gas during dry powder compression. This key feature of the PSU-EVP model helps in isolating the effect of entrapped pore air (or gas) on the mechanical properties of powders.
520 $a Based on the PSU-EVP constitutive model back-prediction results and sensitivity analysis, it was concluded that the model gave fairly good results for most CTT test data collected at 0.62 MPa/minute and 6.21 MPa/minute. However, the back-prediction results obtained at 20.7 MPa/minute had high average relative difference values (>20%). Overall, the PSU-EVP model can be considered to be the first step towards the development of a more robust and accurate constitutive model for the predicting stress distributions in a dry powder during compression process.
520 $a A 3D finite element prediction tool (PSU-FEM v2.0 software) was developed to model the powder compression process in an elastic die. The PSU-FEM v2.0 contained a fast iterative solver based on the multigrid method. The results obtained from the multigrid solver were compared with a conventional Gauss-Siedel iterative method, conjugate gradient, and ABAQUS. The results and the trends were in very good quantitative and qualitative agreement with one another (difference <5%). Sparse matrix techniques were incorporated also into the PSU-FEM v2.0 software, which led to a marked decrease in solution time.
590 $a School code: 0176.
650 4 $a Engineering, Materials Science. $3 1017759
690 $a 0794
710 2 0 $a The Pennsylvania State University. $3 699896
773 0 $t Dissertation Abstracts International $g 64-07B.
790 1 0 $a Puri, V. M., $e advisor
790 $a 0176
791 $a Ph.D.
792 $a 2003
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3097019